寒旱环境春融期土坡稳定性影响分析  

Analysis of the Impact of Soil Slope Stability during Spring Thaw in Cold and Arid Environments

作　　者：翟利健 张小荣 高英 ZHAI Li-jian;ZHANG Xiao-rong;GAO Ying(Qinghai Transportation Planning and Design Institute Co.,Ltd.,Xining 810000,China;City College,Xi an Jiaotong University,Xi an 710018,China)

机构地区：[1]青海省交通规划设计研究院有限公司,西宁810000 [2]西安交通大学城市学院,西安710018

出　　处：《科学技术与工程》2024年第33期14417-14423,共7页Science Technology and Engineering

基　　金：陕西省自然科学基础研究计划(2021JQ-892)。

摘　　要：为解决春融期土坡失稳破坏问题,采用TMS9018-500型冻胀循环试验箱与UU三轴剪切仪相结合的试验方案,获取不同冻融循环次数下土体的抗剪强度参数,并基于冻土水-热-力耦合理论,通过COMSOL多物理场有限元软件对春融期土坡进行数值模拟,分析冻融循环次数对春融期土坡潜在滑移面、位移以及安全系数的发展规律。结果表明:随冻融循环次数的增加,春融期土坡的等效塑性应变随之增加,坡脚的等效塑性应变相对集中,且潜在滑动贯通区自坡脚向坡顶发展;随冻融循环次数的增加,土坡浅层正融区土体位移量逐渐增大,安全系数随之减小,最大减小37.86%左右,说明冻融循环作用使春融期土坡稳定性更加不利。研究成果对春融期的护坡基础建设具有重要的借鉴意义。In order to solve the problem of instability and failure of soil slope in spring thaw period,a test scheme combining TMS9018-500 frost heave cycle test chamber and UU triaxial shear instrument was adopted to obtain soil shear strength parameters under different freeze-thaw cycles.Based on the coupling theory of frozen soil water-heat-force,numerical simulation of soil slope in spring thaw period was carried out by COMSOL multi-physical finite element software.The development law of the number of freeze-thaw cycles on the potential slip surface,displacement and safety factor of soil slope in spring thaw period was analyzed.The results show that with the increase of the number of freeze-thaw cycles,the equivalent plastic strain of the soil slope during spring thaw period increases,the equivalent plastic strain at the foot of the slope is relatively concentrated,and the potential sliding through area develops from the foot of the slope to the top of the slope.With the increase of the number of freeze-thaw cycles,the displacement of the soil body in the shallow positive thaw area of the soil slope increases gradually,and the coefficient of safety decreases,and the maximum decrease is about 37.86%,which shows that the freeze-thaw cycles make the soil slope during spring thaw period more and more unfavorable to stability.This indicates that the freezing and thawing cycle makes the soil slope more and more unfavorable in the spring thawing period.The research results are of great significance for the slope protection infrastructure construction in spring thaw period.

关 键 词：冻融循环作用 水-热-力耦合 冻融界面 土坡稳定性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]