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2期
Civil Engineering
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;biocementation26|3|0更新时间：2026-03-30Civil Engineering
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;stability25|2|0更新时间：2026-03-30Civil Engineering
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 mode57|6|0更新时间：2026-03-30Civil Engineering
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 mechanism41|5|0更新时间：2026-03-30Civil Engineering
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 precursors18|4|0更新时间：2026-03-30Civil Engineering
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 element22|5|0更新时间：2026-03-30
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