Journal of Civil and Environmental Engineering
- Editor-in-Chief：LIU Hanlong
ISSN 2097-6399 (Online)
ISSN 2096-6717 (Print)
CN 50-1218/TU - Language: Chinese and English
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2026年第48卷第4期
Civil Engineering
摘要：In-situ resource-based construction techniques can greatly reduce the cost of lunar surface base construction and guarantee high-quality operation and maintenance. How to make full use of in-situ resources to prepare high-performance building structural materials has become a hot research topic. In this study, geopolymers were prepared using lunar regolith simulant and reinforced with basalt fibers to enhance the mechanical properties of the materials.The effects of basalt fiber content on the failure modes and mechanical properties of lunar regolith simulant geopolymers activated by strong and weak alkali solutions were investigated. The results showed that the incorporation of basalt fibers changed the failure modes of lunar regolith simulant geopolymers and increased their deformation capacity. Under the condition of strong alkali solution activation, the optimal content of basalt fiber was 0.2%; while under weak alkali activation, the optimal content was 0.1%. The compressive and flexural strengths of the lunar regolith simulant geopolymers tended to increase and then decrease with the increase of fiber content. Compared with the strong alkali environment, the basalt fiber content had a more significant effect on the lunar regolith simulant geopolymers in the weak alkali environment.关键词：lunar regolith simulant;geopolymers;basalt fibers;alkaliactivation;mechanical properties;fiber content99|27|0更新时间：2026-07-08Civil Engineering
摘要：In order to study the cyclic shear characteristics of fiber-reinforced granitic residual soil, polypropylene fibers were mixed into the residual soil. The horizontal cyclic simple shear test of fiber-reinforced residual soil was carried out using a cyclic simple shear apparatus. The influence of different fiber contents (0%,0.3%, 0.6%, 0.9%) and cyclic stress ratios (0.15,0.20,0.25,0.30) on the dynamic characteristics of granitic residual soil was analyzed. The test results show that with the increase of cyclic stress ratio, the dynamic shear strain increases. The addition of fibers effectively restrained the development of dynamic shear strain of residual soil, and the higher the fiber content, the smaller the dynamic shear strain. Fibers increase the critical cyclic stress ratio of the residual soil. Under the critical cyclic stress ratio, the number of cycles at failure for reinforced samples is much greater than that for unreinforced ones. This indicates that the addition of fibers increased the toughness of the soil and greatly prolonged the failure time of the soil sample. Under the same cyclic stress ratio, the larger the fiber content, the greater the dynamic shear modulus and damping ratio. For the dynamic shear modulus, the smaller the cyclic stress ratio, the more obvious the advantage of fiber reinforcement. The improved H-D model can be used to analyze the dynamic response of granitic residual soil under different cyclic stress ratios and different fiber contents.关键词：granitic residual soil;fiber reinforcement;shear characteristics;cyclic simple shear;cyclic stress ratio;shear strain39|22|0更新时间：2026-07-08Civil Engineering
摘要：The long-term seepage characteristics of fluid flow in saturated soils are of great importance. The Riemann-Liouville (R-L) fractional derivative was adopted to modify classical Darcy’s law (hereinafter referred to as modified seepage model) to describe the evolution of soil permeability during the long-term seepage process. Data fitting of experimental results given in published literature shows that the modified seepage model could more accurately describe the nonlinear evolution of fluid velocity with time. Moreover, the anomalous permeability coefficient value obtained with the modified seepage model is found to be reasonable. The R-L fractional diffusion equation was derived by integrating the modified seepage model into the one-dimensional Biot consolidation model. The explicit (time domain)-implicit (space domain) difference method was employed to discretize the above equation, and the correctness of the algorithm was verified through two numerical examples. On this basis, the influence of the modified seepage model parameters on the one-dimensional consolidation process of saturated soils was investigated. The results show that the fractional orderCivil Engineering
摘要：The strength and deformation characteristics of overconsolidated clay depend on state factors such as initial void ratio, stress path and preconsolidation pressure. To characterize the state dependence of overconsolidated clay, we define two state parameters: the density-state parameter and the stress-state parameter. The former describes the void ratio difference between the current state point and the corresponding state on the critical state line, and the latter describes that between the dyadic state point and the critical state line. A new stress-state equation is then derived. Finally, the state hardening rule is adopted to describe the hardening law of the subloading surface where the current state point lies, and a state hardening model suitable for overconsolidated clay is established. Comparisons between model predictions and triaxial compression test results of different clays under drained and undrained conditions show that the proposed model exhibits good performance. The results show that stress history affects the stress-state equation of clay. The density-state and stress-state parameters in this equation approach zero when the soil reaches the critical state, and they characterize the compactness and moisture state of the soil respectively. The proposed state hardening rule can reasonably describe the strain softening and dilatancy of overconsolidated clay under drained shear, as well as the effective stress paths and the evolution of excess pore water pressure under undrained shear. The established clay state hardening model has a simple form with a single yield surface. Its material parameters can be calibrated by conventional laboratory tests, so it has good prospects for theoretical application in engineering practice.关键词：clay;state boundary surface;subloading surface;state hardening;constitutive relation144|30|0更新时间：2026-07-08Civil Engineering
摘要：To reduce the degradation of strength and prevent disintegration of carbonaceous mudstone under wet and dry cycling, tests on the unconfined compressive strength (UCS) and disintegration of silicone-modified carbonaceous mudstone under wet and dry cycling were carried out. The effects of the number of dry and wet cycles and the amount of organosilicon on the UCS, grain size gradation, inhomogeneity coefficient and curvature coefficient of the modified carbonaceous mudstone were studied, and the inhibition effect of organosilicon on the strength deterioration and disintegration characteristics of the charcoal mudstone was clarified. The changing pattern of microstructure of organosilicon-modified carbonaceous mudstone was also analyzed by scanning electron microscopy (SEM) to reveal its mechanism of inhibiting disintegration. The results showed that the pattern of modified carbonaceous mudstone was positively correlated with the organosilicon content and negatively correlated with the number of wet and dry cycles. Organosilicon can effectively increase the grain size of carbonaceous mudstone, and the content of coarse particles larger than 2 mm, the maximum grain size(Dmax) and the minimum grain size (Dmin) of modified carbonaceous mudstone were significantly increased after the incorporation of organosilicon. Meanwhile, the particle content of modified carbonaceous mudstone in the [10 mm, 20 mm), [5 mm, 10 mm) and [2 mm, 5 mm) grain groups changed most drastically during the disintegration process, but the greater the organosilicon content, the smaller the magnitude of the change in grain size. Moreover, the higher the organosilicon content, the smaller the change in particle size. The median grain size (d50), Weibull distribution parameters (λ, k), fractal dimension (D), disintegration resistance index (Idn) and disintegration ratio (Dr) of modified carbonaceous mudstone were positively correlated with organosilicon content and negatively correlated with the number of wet and dry cycles. However, the variation rule of the inhomogeneity coefficient (Cu) is opposite. Organosilicone mainly inhibits the strength deterioration and disintegration of carbonaceous mudstone particles by crosslinking them via a network structure and the formation of a hydrophobic film on the surface layer.关键词：embankment engineering;carbonaceous mudstone;organosilicon;hydrophobic modification;disintegration inhibition43|27|0更新时间：2026-07-08Civil Engineering
摘要：The dangerous rock in the Three Gorges Reservoir area has the characteristics of concealment, sudden occurrence, strong destructiveness, and great hazard. The deterioration of rock mass caused by periodic fluctuations of reservoir water level has become a critical threat to the long-term stability of these hazardous rocks. In recent years, scholars have conducted extensive research on the damage and disaster mechanisms of rock mass under the influence of water level fluctuations, as well as on instability models of dangerous rocks and stability calculation methods. Comprehensive analysis and research have led to the conclusion that advancements in testing methods, techniques, and equipment for assessing rock mass damage caused by water-rock interaction have deepened the understanding of disaster mechanisms related to rock mass deterioration and instability modes of dangerous rocks influenced by water level fluctuations. Furthermore, various calculation methods for evaluating dangerous rock stability have been developed. However, there are still six areas worthy of further study: disaster mechanisms and failure characteristics related to water-related hazardous rocks; laboratory simulation experiments under complex dynamic mechanical environments, in-situ tests, and large-scale structural plane detection; regularity and spatial expression of rock mass damage; studies on instability models for dangerous rocks under complex dynamic conditions; cumulative damage assessment and long-term stability studies; instability failure modes associated with water-related hazardous rocks; as well as application of remote sensing technology and machine learning methods.关键词：Three Gorges Reservoir Area;water level fluctuations;rock mass damage;dangerous rock stability;instability mode44|21|0更新时间：2026-07-08
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