最新刊期
卷 48 ， 期 2 ， 2026
- 摘要：Enzyme induced carbonate precipitation (EICP) technique for soil improvement using self-extracted soybean urease solution to induce calcium carbonate precipitation has various advantages such as economic, ecological and environmental considerations. However, the high turbidity of the self-extracted soybean urease solution easily leads to bioclogging during the biogrouting process, resulting in poor biocementation. In this study, an alum-containing solvent was used for the extraction of soybean urease solution to reduce its turbidity. Incorporating soybean urease extraction, solution tests, and sand column solidification with macro- and micro-scale tests were carried out to investigate the effects of alum content on turbidity and biocementation of the extracted soybean urease solution. The results indicate that the addition of an appropriate amount of alum (e.g., 3.0 g/L for 100 g/L soybean powder content) can effectively reduce the turbidity of the self-extracted soybean urease solution without affecting its urease activity. However, excessive amount of alum may lead to a reduction or even loss of urease activity. The use of a low-turbidity soybean urease solution is beneficial in improving the uniformity of its biocementation, without an apparent effect on the morphology and crystallinity of the precipitated calcium carbonate crystals.关键词：enzyme induced carbonate precipitation (EICP);soybean urease solution;alum;turbidity;urease activity;biocementation10|1|0更新时间：2026-03-30
- 摘要：In order to examine the effect of soybean urease without CaCl2 curing treatment on the long-term stability of lead-zinc contaminated soil after restoration without greatly improving the strength of cultivated soil, the long-term stability of contaminated soil after restoration under the complex environment of dry-wet cycles, freeze-thaw cycles and acid rain leaching was discussed by using pH value, heavy metal ion leaching rate and soil heavy metal occurrence form, respectively. The results show that the surface strength of the soil cured by soybean urease without CaCl2 is significantly reduced and the permeability is improved compared with that cured by EICP. With the increase of dry-wet cycles and freeze-thaw cycles, soil pH value decreases slowly but remains weakly alkaline, and the increasing trend of heavy metal leaching rate slows down. Under the action of acid rain, with the increase of pH value of acid rain solution, the contents of Pb2+ and Zn2+ in leached solution gradually decrease, and both meet the requirements of hazardous waste disposal regulations. In addition, different types of acid rain have different effects on repaired soil, and its stability under sulfuric acid rain is better than that under nitric acid rain.关键词：heavy metal contaminated soil;soybean urease;curing treatment;stability15|0|0更新时间：2026-03-30
- 摘要：Rainfall erosion seriously threatens the stability of soil slopes and even induces failure. In this study, jute fiber and the microbial-induced calcium carbonate precipitation technique were combined to carry out ecological reinforcement of loess slopes. A simulated rainfall test was used to analyze the improvement effect and influencing factors of slope erosion resistance. Scanning electron microscope and energy dispersive X-ray spectrometer were used to analyze the mechanism of mitigating rainfall erosion on loess slope from a micro perspective, and to explore the feasible means of mitigating rainfall erosion on loess slope. The results show that: the addition of jute fiber can help to improve the rainfall erosion resistance of microbial-mineralized loess, especially for the medium and high content of medium and long size fibers; the fiber-reinforced loess treated by biomineralization can significantly resist the erosion of weak rainfall (6 mm/h) and short-term heavy rainfall (45 mm/h); under heavy rainfall conditions, the erosion resistance increases with the increase of fiber content, but the increase range gradually decreases, and the highest erosion resistance increases to 64.2%; with the increase of fiber length and fiber content, the thickness difference between C2L5 and C8L25 is 2.86 times. There are two cementation modes in the surface layer of fiber-reinforced microbial mineralized loess: the “intergranular filling” mode formed by the precipitation of calcium carbonate crystals in intergranular pores, and the “wrapped cementation” mode of calcium carbonate formed by wrapping soil particles through fiber connection.关键词：microbial induced calcium carbonate precipitation;fiber reinforced microbial mineralization;loess slope;rainfall erosion;bonding mode31|3|0更新时间：2026-03-30
- 摘要：In recent years, partial deterioration of the gilded layer on the Dazu Thousand-handed and Thousand-eyed Avalokitesvara has posed a serious threat to the preservation of this cultural heritage. In this study, Aspergillus versicolor and Mucor fragilis, previously isolated from the gold foil surface, were selected as model organisms. Laboratory-simulated conditions were employed to investigate their corrosive effects on the gold foil. Corrosion behavior was monitored through pH, open circuit potential, electrochemical impedance spectroscopy, and polarization curves. Additionally, transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) were utilized to characterize morphological and elemental changes. The results demonstrated that both fungal strains significantly accelerated gold foil corrosion. A marked decrease in surface gold (Au) content was observed, accompanied by the enrichment of carbon (C), oxygen (O), and sulfur (S) elements. Electrochemical analyses revealed a negative shift in corrosion potential by 0.20-0.24 V, a nearly tenfold increase in corrosion current density, and corrosion efficiencies of 91.38% and 88.91% for Aspergillus versicolor and Mucor fragilis, respectively. The preliminary mechanistic inferences suggest that organic acids (e.g., citric acid and oxalic acid) produced by fungal metabolism rapidly reduced the local pH to 4.5-4.8, thereby disrupting the passive layer. Moreover, extracellular polymeric substances (EPS) secreted by the fungi facilitated biofilm formation and likely enhanced interfacial reactions through sulfide adsorption. The flake corrosion patterns induced by Aspergillus versicolor were attributed to the increased electrolyte penetration promoted by its hydrophilic polysaccharide-rich biofilm. Conversely, the crack propagation caused by Mucor fragilis was possibly driven by micro-galvanic effects associated with its saccharification products.关键词：Thousand-handed and Thousand-eyed Avalokitesvara;gold foil corrosion;Aspergillus versicolor;Mucor fragilis;corrosion mechanism21|2|0更新时间：2026-03-30
- 摘要：Exploring the mechanical properties of soft-hard interbedded rock mass with different initial damages is crucial for assessing the stability of post-seismic damaged rock masses under cyclic drying and wetting conditions. Taking the interbedded rock mass of metasandstone and phyllite as a research object, the samples with different initial damage degrees were prepared through cyclic loading and unloading tests followed by cyclic drying and wetting tests. Subsequently, uniaxial compression tests were conducted to investigate the deformation and failure characteristics, crack evolution process, and strength degradation laws of samples with different initial damage degrees, to explore the precursor information of sample failure, and to reveal the damage degradation mechanism from a micro perspective. The results indicate that the deformation difference coefficient can quantify the discrepancies in deformation across different areas of the sample surface. The propagation of transcrystalline cracks and intercrystalline cracks extends throughout the loading process, with tensile fracturing being the primary mode of failure. The increase in the proportion of shear fractures will cause an increase in the coefficient of variation (Cv) of the RA/AF values. When the Cv reaches 6.5, the sample is approaching failure. The shear failure mode of the sample is primarily governed by the structural features of the rock mass, while initial damage influences the type of failure and the development of cracks. Initial damage leads to a decrease in elastic modulus, compressive strength, and failure displacement. The increase in microcracks and the weakening of interparticle bonding are the fundamental causes of the deterioration of the rock mass’s macroscopic mechanical properties.关键词：soft-hard interbedded rock mass;initial damage;cyclic loading-unloading;drying-wetting cycles;mechanical properties;acoustic emission;failure precursors10|1|0更新时间：2026-03-30
- 摘要：As a special soil widely distributed in the southeast coastal areas of China, granite residual soil is greatly influenced by water, leading to significant changes in its mechanical properties and greater susceptibility to disasters. To investigate the shear characteristics of the granite residual soil-geotextile interface, the effects of different moisture contents (12%, 16%, 20%, 24%) and vertical stresses (50, 100, 150, 200 kPa) were analyzed through large-scale direct shear tests. Based on the test results, the PFC2D model was established to reveal the meso-mechanism of the graniteresidual soil-geotextile interface under varying moisture content conditions during the shearing process. The results show that the interfacial shear strength and friction angle decrease with increasing moisture content, while the apparent cohesion increases first and then decreases, reaching the maximum value at a moisture content of 16%. Numerical simulation also shows the morphology of the shear zone and the displacement of soil particles. The presence of geotextile prevents the penetration of force chains between the upper and lower sections, and the primary directions of normal and tangential contact forces remain consistent under different moisture contents. Energy dissipation mainly occurs during the sliding between soil and soil particles.关键词：moisture content;granite residual soil;geotextile;reinforcement soil interface;discrete element12|4|0更新时间：2026-03-30
- 摘要：Geogrid has a certain influence on the strength and deformation characteristics of coarse-grained materials, and accurately describing the macroscopic mechanical behavior of geogrid-reinforced coarse-grained materials during loading is of great significance. In order to investigate the constitutive model which can reasonably describe its strength and deformation characteristics, based on the conventional triaxial test results of geogrid-reinforced coarse-grained materials, a nonlinear dilatancy equation is proposed in this study to reasonably describe the dilatancy and shrinkage characteristics of geogrid-reinforced coarse-grained materials. Compared with the Rowe and Cambridge model shear dilatancy equations, it is proved that this equation has advantages in predicting the shear dilatancy characteristics of geogrid-reinforced coarse-grained materials. Combined with the theory of generalized plasticity model, an elastoplastic constitutive model that can reflect the deformation and strength characteristics of geogrid-reinforced coarse-grained materials is proposed. There are totally 6 parameters in the model, all of which have clear physical meanings and can be determined by conventional triaxial tests. Finally, the accuracy of this model is fully proved by simulating the static tests under different confining pressures. The results show that the established model can reasonably describe the complex softening, hardening, and dilatancy and shrinkage behaviors of different types of geogrid-reinforced coarse-grained materials, providing an effective constitutive tool for corresponding engineering applications.关键词：geogrid;coarse-grained materials;dilatancy equation;generalized plastic theory;constitutive model9|0|0更新时间：2026-03-30
- 摘要：Phosphogypsum, as one of the industrial solid wastes, can enhance the soil strength but also increase the brittleness while the fiber reinforcement technique can improve the soil plasticity. The synergy between the two materials (phosphogypsum and fiber) can play a complementary role in improving the mechanical properties of soils. The loess from Yangling, Shaanxi Province, was used to explore the optimal mix ratio of phosphogypsum in the loess by unconfined compressive strength (UCS) tests. Then, the optimal mix ratio of fiber in the mixture of phosphogypsum and loess was investigated by the direct shear test based on the mixture ratio above. Finally, the microscopic mechanisms of loess improvement with phosphogypsum and polypropylene fibers were examined through scanning electron microscopy (SEM). The results showed that the loess UCS increases first and then decreases with an increase in the phosphogypsum mass when the phosphogypsum is mixed with the loess for reinforcement, and the optimal mix mass ratio of phosphogypsum in the loess is 12% in this study. The polypropylene fibers were then mixed into the mixture of phosphogypsum and loess based on the optimal mix mass ratio of phosphogypsum in the loess. It can be found that the peak strength, cohesion, and residual strength of the mixture sample increase first and then decrease, while the internal friction angle increases, with an increase in the polypropylene fiber content. The microscopic test results also indicated that the phosphogypsum-improved loess and phosphogypsum-polypropylene fiber-improved loess both significantly enhance the cementation and fill the voids among soil particles. Polypropylene fibers in loess can form fiber clumps to wrap the soil particles, thereby providing tensile stress and improving the plasticity for the soil sample.关键词：loess;phosphogypsum;polypropylene fiber;strength properties;microscopic mechanisms8|1|0更新时间：2026-03-30
- “介绍了其在土体改良领域的研究进展，相关专家开展了石灰-木质素改良黏土的共振柱试验，分析了固结围压、石灰-木质素掺量对改良土动剪切模量特性的影响，基于相对结构度方法提出改良土最大动剪切模量的表征模型，为评价石灰-木质素改良黏土的动剪切模量提供借鉴。”摘要：Using lignin for soil stabilization is one of the effective measures for lignin disposal. In order to study the effect of lim-lignin on stabilizing clay, a set of resonance column tests was conducted on clay stabilized by lime-lignin. The effects of confining pressure and lime-lignin content on the dynamic shear modulus characteristics of the stabilized soil were analyzed. Based on the relative structural degree method, a characterization model for the maximum dynamic shear modulus of the stabilized soil was proposed. The results show that the maximum dynamic shear modulus and dynamic shear modulus ratio of clay stabilized by lime-lignin increase with the increase of confining pressure. The maximum dynamic shear modulus and dynamic shear modulus ratio of 4% lime +4% lignin stabilized clay are the highest. Under the confining pressure of 300 kPa, the maximum dynamic shear modulus of 4% lime +4% lignin stabilized clay is 17.3% higher than that of 8% lime stabilized clay and 185.4% higher than that of pure clay. Based on shear strength parameters, the relative structural degree of stabilized soil is calculated and the relative structural degree of 4% lime +4% lignin stabilized clay is the highest. On the basis of Hardin formula, a characterization model of maximum shear modulus is established by introducing the relative structural degree. The model has good accuracy and can provide a basis for evaluating the dynamic shear modulus of clay stabilized by lime-lignin.关键词：lime-lignin;stabilized clay;dynamic shear modulus;modulus ratio;relative structural degree7|1|0更新时间：2026-03-30
- 摘要：The coefficient of earth pressure at rest K0 is an important parameter for geotechnical engineering. In order to study the influencing factors and mechanisms of peat soil K0, a K0 consolidation instrument was used to conduct a lateral compression test on Kunming Dianchi peat soil. The effects of vertical stress, organic matter content and initial void ratio on K0 were systematically analyzed, and from the structural perspective, the formation mechanism of its K0 change law was explored. The test results show that the coefficient of earth pressure at rest of reshaped peat soil is not a constant, but is related to the vertical stress and content of organic matter; K0 decreases with the increase of vertical stress during loading and finally tends to be stable. The decreasing trend of K0 under stress is more significant; under the same vertical stress, the greater the organic matter content of the soil sample, the smaller K0, and the greater the decrease in K0 during the entire loading process; the dynamic changes in the structural properties of peat soil during the loading process are the fundamental cause of changes in K0. Vertical stress and organic matter affect K0 by affecting its structural properties, and there is a certain coupling relationship between the two; the K0 value after stabilization of reshaped peat soil is between 0.42 and 0.6, which is lower than that of inorganic clay, and has a linear negative correlation with the organic matter content. Based on the experimental results, a corresponding fitting relationship is proposed; the relationship between the initial void ratio and the K0 value is relatively discrete.关键词：peat soil;coefficient of earth pressure at rest;confined compression test;structural property;organic matter content6|0|0更新时间：2026-03-30
- 摘要：Fluidized solidified soil, due to its high fluidity, self-compaction, and controllable strength, can solve filling engineering problems such as narrow backfill sites and narrow backfill spaces, and fluidized solidified materials mainly include cementitious components and flow components. Using slag and cement as basic cementitious materials, the appropriate dosage of the activators (quicklime and sodium silicate) were determined through single factor tests. Response surface analysis was conducted using Design Expert software to obtain the optimized ratio of composite cementitious materials. The types and microstructure of solidified sludge products were obtained through XRD and SEM experiments, and the solidification mechanism of composite cementitious materials was analyzed. The results showed that the optimized ratio of composite cementitious material (CCM) cement∶slay∶quicklime∶sodium silicate was 38∶42∶9.7∶6.5. The fluidity and strength of the fluidized solidified sludge using CCM were better than those using only cement. The hydration products of CCM solidified sludge mainly include hydrated calcium silicate gel and ettringite. The hydration products encapsulate soil particles and fill pores, significantly improving the strength of fulidized solidified sludge. The strength improvement of CCM solidified sludge includes hydration, alkali induced pozzolanic reaction, ion exchange, micro expansion and filling effects.关键词：fluidized solidified soil;sludge;composite cementing material;unconfined compressive strength;curing mechanism20|2|0更新时间：2026-03-30
- “乌鲁木齐市加筋土挡墙工程研究取得新进展，专家基于Plaxis有限元模型，探索了极端温度变化下挡墙内部温度场变化特性，为加筋土挡墙设计与施工提供理论依据。”摘要：To investigate the changing regularity of the temperature field of a geogrid-reinforced soil (GRS) retaining wall under extreme temperature fluctuation, this study focused on a GRS retaining wall in a Urumqi engineering practice. Finite element models were constructed and employed to analyze the inner temperature distribution characteristics of the GRS retaining wall, taking into account the influence of solar radiation. The findings indicate a strong correlation between the inner temperature field of the GRS retaining wall and variations in environmental temperature, with the isotherm closely resembling a hyperbolic shape. Specifically, the field within approximately 3.0~4.0 m behind the facing panels and about 2.0 m below the top surface of the GRS retaining wall can be classified as a temperature-sensitive region. Furthermore, the width of this temperature-sensitive region expands in proportion to the thermophysical parameters. The utilization of filling materials possessing enhanced thermophysical properties can effectively alleviate the average temperature gradient; however, the magnitude of the average temperature gradient predominantly depends on the rate of fluctuation in the external temperature. The maximum depths of frost show an increase with the saturation of filling materials, with the most significant increment observed during the transition from a saturation level of 0 to 0.2.关键词：GRS retaining wall;temperature field characteristics;filler material thermal properties;extreme temperature fluctuation;finite element simulation11|2|0更新时间：2026-03-30
- 摘要：In order to study the spatial effect characteristics of surface settlement at different characteristic profiles during dewatering excavation of subway pits under non-equilibrium loading, a subway station pit project in Nanchang is taken as the background, and a three-dimensional numerical model is established with PLAXIS 3D for simulation. The simulated values demonstrate a strong correlation with the measured values, which verifies the efficacy of numerical simulation. By altering the magnitude of the non-equilibrium loading and dewatering excavation conditions, the impact of different loadings on the settlement outside the pit under step-by-step and one-time dewatering excavation conditions was studied. Additionally, the spatial effect characteristics of settlement at various characteristic profiles were analyzed. The spatial effects of surface settlement outside the pit under different non-equilibrium loading and dewatering schemes were discussed. The findings indicate that due to the influence of non-equilibrium loading, the settlement on the side close to the loading is greater than that on the side far from the loading. In comparison with the one-time dewatering excavation condition, the settlement values at each characteristic profile outside the pit are reduced under the step-by-step dewatering excavation condition. Under both dewatering excavation conditions, the non-equilibrium loading weakens the spatial effect of settlement on the side near the loading. Conversely, the effect on the spatial effect of the settlement on the side far from the loading is the opposite, which is related to the combined effect of non-equilibrium loading and segmented excavation.关键词：foundation pit dewatering;surface settlement;spatial effect;non-equilibrium loading;numerical simulation6|0|0更新时间：2026-03-30
- “南京地铁10号线盾构穿越群桩工程中，专家通过数值模拟和理论分析，研究盾构切桩动力响应特征，为盾构施工安全提供技术支撑。”摘要：The present study investigates the dynamic response characteristics during the shield cutting pile process. The dynamic response induced by shield cutting pile impact load was solved by combining numerical simulation and theoretical analysis with the background of the shield crossing group pile project of Nanjing Metro Line 10. Concurrently, vibration sensors were installed on the cutterhead to monitor the dynamic response of the shield cutting pile. The results of the study indicate that: (1) When the shield cuts the reinforced concrete pile foundation at a low speed of approximately 5 mm/s, the thrust and torque changes are small, and the thrust and torque show obvious hysteresis because the pile foundation is cylindrical and the cutting section increases slowly. The peak thrust and torque are about 1.3 times and 1.25 times the initial value. (2) As demonstrated by the simulation results, the rebar incision presents a compression-tension fracture under the action of multiple cuts by the cutter. Under the impact loading, multiple dynamic response waveforms appear at the cutterhead bearing position with peaks close to 0.6g. (3) The measured data show that under the impact load, the time domain curve of cutterhead vibration acceleration shows several consecutive peaks with an interval of about 0.1 s and an amplitude of 0.5g. The measured impact response waveform is highly consistent with the theoretical solution and they verify each other. The waveform can be used as a typical characteristic of continuous cutting of steel bars by multiple cutters. (4) During the whole pile cutting process, the acceleration response and peak value are significantly higher, and the maximum intensity is about twice as high as when cutting clay ground. After this, the response will undergo a rapid decline.关键词：shield cutting pile;reinforced concrete pile;dynamic response;time-frequency characteristic;real-time monitoring;numerical analysis11|5|0更新时间：2026-03-30
- “介绍了其在地铁施工领域的研究进展，深圳地铁专家建立了增层开挖卸荷作用下既有桩基桩侧摩阻力的计算公式，为解决新建地铁车站增层开挖对既有桩基承载力影响问题提供了理论支持。”摘要：During the construction of a new subway station beneath an existing operational tunnel, the shaft resistance of existing piles induced by excavation may decrease, and thus affect the bearing capacity of the piles. Currently, the theory of computing the shaft resistance for existing piles induced by excavation is not clear. Taking Shenzhen Metro Line 13 Gongming Square Station crossing the existing Line 6 project at zero distance as a case study, a calculation formula of pile shaft resistance induced by excavation under existing buildings is obtained by using the Mindlin stress solution. By comparison with the numerical simulation results, the correctness of the Mindlin stress solution is proved. The influence of parameter changes on pile shaft resistance and unloading stress is analyzed. The results show that: when the depth of excavation increases, the total pile shaft resistance decreases, and the ratio of sidewall unloading stress to total unloading stress increases; when the excavation area increases, the total pile shaft resistance increases, and the ratio of sidewall unloading stress to total unloading stress decreases. Therefore, when the excavation depth is large, the excavation area is small, or the shaft resistance of side piles is taken into consideration, the influence of the sidewall unloading stress must be taken into account.关键词：subway station;layered excavation;pile shaft resistance;unloading stress;Mindlin,s stress solution20|2|0更新时间：2026-03-30
- “介绍了钢筋混凝土结构状态监测领域的研究进展，专家们探索了钢筋锈蚀与混凝土耐久性监测新技术，为保障结构性能开辟了新方向。”摘要：The need for monitoring the condition of RC structures is imperative in order to safeguard their performance level, and this conventional approach has engendered novel development opportunities due to technological advances in related fields. In this paper, new technologies for reinforcing steel corrosion monitoring and concrete durability monitoring in reinforced concrete structures in recent years are reviewed: in the aspect of reinforcing steel corrosion monitoring, chemical monitoring methods such as the half-cell and natural potential monitoring method, polarisation resistance technology, current noise assessment method and physical monitoring techniques such as the ultrasonic monitoring method, physical imaging technology, electromagnetism monitoring technology and new monitoring methods based on artificial intelligence are reviewed; in the aspect of concrete condition and durability monitoring, the ultrasonic monitoring, digital imaging technology monitoring, damage evaluation index system research and other monitoring technologies based on the deterioration of concrete itself, and monitoring technologies based on the crack assessment of the concrete condition and new technologies based on artificial intelligence are reviewed; in the area of sensors and signal processing technology, an overview of optical fiber sensors and other new sensor technologies in the monitoring of corrosion of reinforcing bars and the latest research progress in the monitoring of the condition of concrete is presented. In conjunction with the advancement of front-end technologies at the condition-aware layer, the integration of artificial intelligence technologies is a prevailing trend in the future interdisciplinary development of RC structure condition monitoring.关键词：reinforced concrete structures;structural monitoring;sensors;evaluation;reinforcement;repair12|5|0更新时间：2026-03-30
- “介绍了其在带减振器斜拉索索力测试领域的研究进展，专家提出了一种基于IWPA-LKCNN-LSTM的智能识别方法，为解决实际工程中索力测试难度大、精度低的问题提供了精准的解决方案。”摘要：In order to address the challenges posed by the complexity and imprecision inherent in assessing cable tension with a damper in practical engineering, an intelligent identification method of the cable tension with damper based on IWPA-LKCNN-LSTM is proposed. The dynamic response test of the cable with a damper in practical engineering is carried out. Based on the data obtained from the test, a deep learning model that can intelligently identify the cable tension with a damper is developed. The model takes the cable tension, length, line density, frequency, and order as the feature inputs. First, the hyperparameters in the LSTM neural network are adaptively optimized by using the IWPA. Then LKCNN-LSTM is used for training. The intelligent recognition of the cable tension with a damper is realized. The average error between the recognized cable tension value on the test set and the actual cable tension value is a mere 2.024%, the mean square error value is only 0.099 4%, the coefficient of determination is 0.980 6, and the cable tension error is less than 5%. In conclusion, a comparison is made with the formula of cable tension calculation and other machine learning algorithms. The results show that this method can realize the intelligent and accurate recognition of the cable tension with a damper, signifying a broad spectrum of potential applications.关键词：stay cable;tension identification;damper;deep learning;improved wolf pack algorithm (IWPA)12|2|0更新时间：2026-03-30
- “介绍了其在张弦梁结构损伤识别领域的研究进展，相关专家建立了基于结构模态的子构件曲率变化损伤识别指标体系，为降低无损伤杆件误判率提供有效解决方案。”摘要：In order to clarify the damage identification method applicable to each member type of beam string structures with an improved configuration of lower chords and struts, and to reduce misjudgments at non-damaged members, this paper proposes a damage identification index based on sub-component curvature variation and structural modes. The validity of the index was illustrated by analyzing a simply supported beam structure with a simple structural form. The finite element software ANSYS was used to establish the analysis model of beam string structures with an improved configuration of lower chords and struts. The damage of the members was simulated by reducing the elastic modulus of the member elements. Considering the symmetry and complexity of the structure, damage conditions of single damage, multiple damage, and small damage level were set up on the members at the mid-span, quarter-span, and near the bearing ends, respectively. The improved curvature absolute difference index of sub-components and the sub-component curvature variation based on structural mode proposed in this paper were used for the comparative analysis of damage identification. The findings demonstrate that the index of sub-component curvature variation based on structural modes can achieve the precise localization of single and multiple damages in the structure. This index is also highly sensitive to slight damage, making it an effective method for identifying damage to beam string structures with an improved configuration of lower chords and struts.关键词：beam string structures;lower chords;struts;damage identification;modal parameters6|0|0更新时间：2026-03-30
- “在低光照领域，专家提出基于迭代Otsu法的桥梁结构动挠度视觉测量方法，通过多次迭代求解光斑图像ROI区域前景阈值，配合光斑圆形度和帧间面积一致性约束，不断缩小灰度阈值范围，最终找到可有效分离图像前景光斑与背景的理想阈值，并结合灰度质心法准确计算出被测结构动挠度变化，验证了该方法在有强光和雾气干扰的低光照环境下仍能准确识别出结构动挠度，为解决低光照环境下结构动挠度视觉测量精度问题提供了有效方案。”摘要：Currently, researchers use LED targets in combination with the image thresholding method to address the issue of decreased visibility and resolution of structural surfaces in low-light environments. This approach ultimately leads to poorer performance when measuring structural dynamic parameters using vision-based technology. However, complex ambient lighting and unfavorable weather in practical applications will inevitably induce negative effects on the vision-based measurement of structural parameters. Therefore, in order to deal with this issue, a novel vision-based measurement method is proposed in this paper based on the iterative Otsu algorithm. In this method, the correct segmentation of the foreground spot and the background under strong light and fog interference can be realized by iteratively solving the image foreground threshold while combining with the iterative constraints of spot roundness and inter-frame area consistency, and finally the structural dynamic deflection can be obtained after the spot center is collected using the gray centroid algorithm. Firstly, this paper introduces the principle of image thresholding segmentation based on the proposed iterative Otsu algorithm, as well as the corresponding procedure for structural displacement measurement. Subsequently, a cantilever beam specimen is employed to validate the feasibility and effectiveness of the proposed method, and finally the results demonstrate that the proposed method can realize the accurate identification of the structural dynamic deflection under low-light conditions even when influenced by strong light and fog.关键词：vision-based measurement;bridge deflection;LED targets;Otsu method17|1|0更新时间：2026-03-30
- 摘要：The proposal entails the utilisation of a replaceable steel-hybrid composite beam, accompanied by an adhesive joint bridge panel and a removable high-strength bolt-shear bond. In order to analyze the influence mechanism of different joint forms on the mechanical properties of the fully assembled composite beam in the positive moment zone, four composite beams with different bridge panel joint forms were designed and prepared, and a static loading test was completed. The mechanical characteristics of each specimen, including failure mode, bearing capacity, ductility, flexural stiffness and interface slip, were analyzed. The findings indicate that, in comparison to cast-in-place beams, which demonstrate failure in bending, fully assembled composite beams manifest bending-shear failure, with the main crack occurring near the adhesive joint, indicating concrete cohesion failure. Linear, stepped and dovetail joint beams showed a reduction in flexural capacity of 4.78%, 2.07% and 2.04% respectively compared to cast-in-place beams. The bridge deck dominated by compression has a relatively minor impact on the bearing capacity of the jointed beam. The presence or absence of joints exerts a significant influence on the overall ductility of the composite beam. The ductility coefficient of the cast-in-place beam is 14.39%, 34.87% and 7.75% higher than that of the straight joint, stepped joint and tongue-and-groove joint, respectively. The overall elastic stiffness of composite beams is not significantly affected. The elastic stiffness of the lap joint beams are reduced by 0.55%, 5.43% and 2.06% respectively. The slip at the end of the cast-in-place beams is the largest, while the maximum slip of fully assembled composite beams occurs near the joints. Among different joint forms, the tongue and groove joint exhibits the best performance in terms of strength and stiffness. Finally, based on plastic theory, the calculation formula for the flexural capacity of fully assembled composite beams considering the influence of high-strength bolted joints and adhesive joint bridge panels is proposed.关键词：fully assembled steel-concrete composite beam;adhesive joint;bridge deck;high-strength bolts;experimental study10|3|0更新时间：2026-03-30
- 摘要：In order to study the influence of asphalt pavement temperature on the fatigue properties of welded details of an orthotropic steel bridge deck based on linear elastic fracture mechanics, this paper studies the influence of asphalt pavement temperature on the stress of welded details and the stress intensity factor of a fatigue crack tip at the weld toe of the roof. A crack correction coefficient prediction model is established based on the XGBoost algorithm. The results show that the influence of asphalt pavement thickness and temperature effect on the fatigue properties of welded details of steel bridge decks cannot be ignored. Under high temperature conditions, the fatigue crack propagation rate at the weld toe of the roof is faster, and the crack shape ratio has a greater influence on the effective stress intensity factor. Therefore, it is unsafe to evaluate the effect of pavement temperature on the fatigue performance of welded details of steel bridge decks only by stress. The stress at the weld toe of the roof and the effective stress intensity factor at the crack tip are nonlinearly related to the temperature effect of the pavement layer. Combined with the prediction model of the crack correction coefficient established in this paper, the effective stress intensity factor of the fatigue crack tip can be effectively predicted, which is convenient for the rapid evaluation of the fatigue properties of welded details under the influence of temperature in engineering.关键词：steel bridge deck;temperature effect of pavement;fatigue cracks;stress intensity factors;XGBoost algorithm11|2|0更新时间：2026-03-30
- 摘要：In the case of unreinforced concrete structures that utilise H-shaped steel as a skeletal framework, concrete specimens integrated with H-shaped steel were prepared to represent varying degrees of corrosion, specifically rates of 0%, 5%, 10%, 15%, and 20%. Push-out tests were conducted to analyze the bond stress-slip relationship between H-shaped steel and concrete under different corrosion levels at the interface. This paper sets out an experimental method to derive the distribution of bond stress across the steel-concrete interface. The method involves measuring the compressive displacement on the surface of the concrete. It is evident from the observations derived from the experimental tests that four microscopic mechanisms are postulated to elucidate the impact of corrosion on the bond performance of H-shaped steel in concrete. A constitutive relationship was constructed, incorporating the effect of the corrosion rate on bond stress-slip, and an interface damage parameter was introduced to analyze the evolution of interface damage under varying corrosion rates. The research results indicate that the initial bond stiffness at the H-shaped steel-concrete interface increases with the corrosion rate. Nonetheless, upon attaining peak stress levels, the rate of decline in interface stiffness is observed to accelerate concomitantly with an increase in corrosion rate. It is noteworthy that at elevated corrosion rates (≥15%), the bond-slip curve manifests a dual-peak feature, initially ascending, then descending, followed by an additional rise, and ultimately a decline. As the corrosion rate increases, the roles of chemical bonding and microscopic mechanical bonding become more dominant, while the contributions of macroscopic mechanical bonding and rust interface bonding diminish. The developed constitutive relationship, validated through comparative analysis with existing models, accurately describes the bond characteristics at the corroded H-shaped steel-concrete interface. Although an increase in corrosion rate hastens the reduction of interface stiffness, its influence on the extent of damage observed upon specimen failure is relatively limited.关键词：corrosion;H-shaped steel-concrete;bond-slip behavior;pull-out tests;constitutive relationship17|2|0更新时间：2026-03-30
- “介绍了其在输电线路安全运行领域的研究进展，专家建立了长横担输电塔 - 线体系精细化模型，为保障高海拔地区输电线路安全运行提供解决方案。”摘要：Transmission lines are vulnerable to impairment by a variety of disasters including high winds and ice cover, which pose a significant threat to energy security. At present, studies on wind and ice disasters on transmission lines are mostly focused on low-altitude areas.However, many west-east transmission lines cross vast plateau areas, in which long cross-bar transmission towers account for a larger proportion. In order to ensure the safe operation of transmission lines in high-altitude areas, this paper establishes a long cross-bar transmission tower-line system refined model relying on a ±800 kV UHV DC transmission project, based on the ice-covering conditions in high-altitude areas, ice-covered working conditions of transmission towers and transmission lines are established respectively. Concurrently, the wind load characteristics of high-altitude and low-altitude areas are compared and analyzed, taking into account the influence of environmental factors such as air density, topography and geomorphology in high-altitude areas. Finally, based on the ice-covering conditions and wind load characteristics in high-altitude areas, wind-induced vibration response analysis of the long cross-bar transmission tower-line system is carried out. The findings indicate that the wind profile at elevated altitudes is comparatively gentle, the displacement response at the cross-bar of the long cross-bar transmission tower-line system is more pronounced than that at the tower's summit, and the maximum displacement response of the structure under ice-wind loads occurs at the midpoint of the cross-bar end.关键词：high-altitude areas;long cross-bar;transmission tower-line system;ice cover;wind-driven dynamic response16|1|0更新时间：2026-03-30
- 摘要：The avalanche characteristics of the destruction of porous dielectric materials are closely related to their failure mechanism. To investigate the avalanche characteristics of concrete during tensile and compressive failure based on acoustic emission statistics, concrete uniaxial compression and Brazilian splitting tests were carried out, the acoustic emission signals in the loading process were monitored, and the statistical characteristics of the acoustic emission signals such as amplitude, absolute energy, duration and waiting time were compared and analyzed. The results show that the maximum acoustic emission energy is distributed near the peak stress, but the number of signals in the splitting process is much lower than that in uniaxial compression. The b-value increases first and then decreases, and the b-value decreases earlier and the change range is larger under splitting failure, indicating that the large cracks appeare earlier and are more easily destroyed. The probability density distributions of absolute energy, amplitude and duration of acoustic emission in response to tensile and compressive failure conform to a power law. However, the corresponding avalanche exponent values are different, which is related to the failure mechanism during the process of failure. The absolute energy distribution of the splitting failure is found to be in close proximity to the pure power law distribution, while the compressive failure is consistent with the damped power law distribution, and the corresponding absolute energy exponent value is found to be larger. indicating that the proportion of large energy signals in the specimen increases with the increase of load. The probability density distribution of waiting time under tensile and compressive failure is found to be similar, thereby demonstrating the stability and the applicability of the statistical law.关键词：concrete;uniaxial compression;Brazilian splitting;acoustic emission;avalanche characteristics10|3|0更新时间：2026-03-30
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