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- 摘要：Given the generally high level of infrastructure safety during natural hazards, existing resilience indexes struggle to effectively differentiate the varying safety levels of different infrastructures. To address the limitation, the uncertainties in natural hazard intensity and infrastructure parameters are first characterized to calculate the expected value of infrastructure functional losses caused by multiple natural hazards over a given time period. Based on the probability integral transform, a resilience index is defined that can effectively distinguish the safety levels of different infrastructures. Subsequently, the damage probability of infrastructure under uncertainty, the expected value of functional losses for damaged infrastructure, and the expected value of recovery time for damaged infrastructure are calculated respectively, thereby constructing an efficient calculation method for infrastructure resilience under natural hazards. Finally, the proposed resilience index and calculation method are applied to study the resilience of highway slopes under rainfall. The results indicate that the resilience index of highway slopes exhibits a negative correlation with the damage probability, expected value of functional loss, and expected value of recovery time. Among these factors, the damage probability has the most significant impact on the resilience of highway slopes.关键词：resilience index;infrastructure;natural hazards;uncertainty;damage probability5|0|0更新时间：2026-05-07
- 摘要：Frozen soil, as a multiphase geomaterial composed of soil particles, ice, unfrozen water, and air, exhibits pronounced temperature and strain rate dependence on its uniaxial mechanical behavior. This study conducted uniaxial compression tests under 12 combinations of temperatures (-5 ℃, -10 ℃, -15 ℃, -20 ℃) and strain rates (10-3 s-1, 10-4 s-1, 10-5 s-1), systematically revealing the evolution of mechanical behavior, including strength enhancement and ductility reduction with decreasing temperature or increasing strain rate, along with significant coupling effects of temperature-strain rate on peak stress, peak strain, and residual stress. To address the challenge in modeling the coupling behavior of temperature and strain rate, the transformed stress incorporating the triaxial tensile strength (σT) is adopted to derive the strain hardening expression based on the Cambridge model incorporating the cohesive effect. This expression is analogously extended to formulate a uniaxial compressive hardening expression. Furthermore, a strain-driven degradation function for potential compressive strength is proposed to complete the uniaxial constitutive relationship for frozen soil. Five parameters of the model were determined by analyzing the experimental rules relating to temperature and strain rate, and model verification was also conducted. The results demonstrate that the model effectively captures the mechanical response of frozen soils under the coupled effects of temperature and strain rate, thereby providing a theoretical basis for the design and analysis of engineering projects involving frozen soils.关键词：frozen soil;temperature;strain rate;Uniaxial compression test;Constitutive relationship6|0|0更新时间：2026-04-20
- 摘要：To investigated the impact of rainfall conditions and longitudinal drain blockage on the lining structure safety of karst tunnels, the Hu-Xi-Tai Tunnel of Zhejiang Lin-Jian Expressway was used as a supporting engineering, the mechanical properties of the tunnel lining structure under different water head heights and longitudinal drain blockage degrees were investigated adopted by indoor physical model experimental methods, and the field monitoring analysis was carried out in different rainfall seasons. The results illustrate that: (1) The decline rate of the water level in the karst cavity increases almost linearly with the increase of water head height. However, when the water head exceeds 50cm, the increase rate slows down, indicating that the drainage capacity of the tunnel is insufficient. (2) The drainage volume continuously increases with the increase of water head height, and the increase rate gradually accelerates, particularly after reaching a water head of 80cm. (3) The water pressure behind the lining and the pressure stress of the lining structure both continuously increase with the increase of the water head height. Moreover, the growth rate significantly accelerates after surpassing a water head height of 50cm, with increases of 77.2% and 39% respectively. (4) The greater the degree of drainage pipe blockage, the more sensitive the change of water pressure behind lining and pressure stress of lining structure with the water head height. Compared to low blockage conditions of longitudinal pipe, the water pressure and pressure stress growth rates increase by 27.6% and 60.9% respectively when the longitudinal pipe is completely blocked. These research results can provide a theoretical basis for the safety assessment of lining structures of karst tunnels under heavy rainfall conditions.关键词：karst tunnel;Longitudinal drain blockage;lining structure;rainfall conditions;mechanical properties2|2|0更新时间：2026-04-08
- 摘要：To enhance the effect of Microbially Induced Carbonate Precipitation (MICP) in reinforcing sandy soil, this study optimizes theparticle gradation of standard sand with natural gradationusing both uniform design and continuous design schemes based on previous studies.The solidification mechanism of the MICP-treated sand under different particle gradation optimization schemes was evaluated by integrating macroscopic physical and mechanical tests and microscopic detection. The results showed that: (1)Both optimization schemes were able to increase the density of the standard sand, decrease the porosity of the specimens, and improve the pore structure to varying degrees.The calcium carbonate yield increased by 11.19% and 24.95% under the uniform design and continuous design schemes, respectively; the permeability coefficient decreased by 28.07% and 38.07%, respectively; and the porosity after solidification was reduced by 9.23% and 11.86%, respectively.The above resultsindicated that a more significant improvement in overall density and impermeability. (2) Under the continuous design, the maximum failure stress and strain reached 3.15 MPa and 2.86%, respectively. This result represented an improvement of 16.11% and 15.32% compared to the uniform design, respectively,indicating that the continuous design scheme more effectively enhanced the strength and deformation resistance. (3)Both schemescould increase the coefficient of nonuniformity and reduce the porosityof standard sand. Compared to the uniform design, the continuous designresulted in a higher degree of the coefficient of nonuniformity, a larger average pore sizeand a more reasonable pore structure.The structure ensured the infiltration of bacterial and cementation solutions, provided a better environment for calcium carbonate deposition, and had better effects on improving thedensity, calcium carbonate production, mechanical performances and impermeability.The related research approach can provide a reference for the reinforcement of sandy soil foundations.关键词：MICP;gradation optimization;mechanical property;microstructure;enhancement mechanism8|7|0更新时间：2026-03-27
- 摘要：Geological hazards along pipeline engineering have the characteristics of concealment and suddenness. In response to the difficulties and huge workload of traditional manual ground inspections in identifying geological hazards along pipeline engineering, as well as the lack of academic reports on the identification of geological hazards along pipeline engineering, the "three inspections" system of sky air ground collaborative investigation is used to carry out early identification of geological hazards along pipeline engineering, and comprehensive analysis is conducted on typical identification results to discuss the reliability of its engineering application. Taking the Longquan Mountain Range located in the southern suburbs of Chengdu as the research area and a pipeline project laid here as a demonstration, time-series InSAR (Interferometric Synthetic Aperture Radar) surface deformation time-series monitoring and feature recognition were carried out along the route; Using airborne LiDAR (light detection and ranging) technology to obtain real surface micro topography data under vegetation for precise identification of geological hazards in key deformation areas; And combined with field investigations to ultimately verify and determine geological hazards that may affect pipeline engineering. The results showed that the collaborative use of the "three inspections" of sky, air, and ground identified a total of 89 geological hazards along the project route, mostly small-scale landslides, collapses, and water damage disasters, and a few typical disasters were confirmed to pose a direct threat to the pipeline after on-site investigation and analysis. Research has shown that integrating the "three inspections" technology into a multi-level hazard identification method system can effectively be used for identifying geological hazards along linear ranges such as pipelines, valleys, and rivers, providing reference for geological hazard prevention and control in pipeline engineering.关键词：space-air-ground investigation system;InSAR;airborne LiDAR;petroleum pipeline;geological hazards;early identification3|20|0更新时间：2026-03-27
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