土质路堑边坡冻融浅层的滑塌机理与数值模拟  

Mechanism behind shallow landslide in freezing-thawing siol slope in seasonal frozen region and its numerical simulation

作　　者：武鹤[1,2] 刘莹莹 葛琪[1] 

机构地区：[1]黑龙江工程学院土木与建筑工程学院,哈尔滨150050 [2]中国地质大学工程学院,武汉430074 [3]哈尔滨远东理工学院土木与建筑工程学院,哈尔滨150076

出　　处：《黑龙江科技大学学报》2017年第5期503-507,共5页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省自然科学基金项目(E201117)

摘　　要：春融期土质路堑边坡经常发生浅层滑塌。在新近滑塌的哈同公路土质路堑坡体附近取样,测量边坡滑塌时边坡土体的含水率、黏聚力及内摩擦角等参数的变化,并研究土体抗剪强度随深度的变化规律。通过数值模拟,分析土质边坡自冻结开始至春融期全部融化约200 d的温度变化规律。结果表明:随着深度的增加,含水量先增加后降低,土体抗剪强度呈先减小后增加的趋势,在融化界面处土体基本达到饱和状态,抗剪强度极低;边坡达到最大冻结深度后,自坡面开始向坡体内部融化,至一定深度时坡体发生破坏。该研究成果对春融期土质路堑边坡滑塌治理具有重要的指导意义。This paper is aimed at addressing the shallow collapse in the soil slope in Harbin-Tongjiang highway in spring thawing period by experimenting on the cutting slope.The study involves investigating the soil samples near the slide body, and measuring the water ratio, cohesion, internal friction angle, and other parameters, determining the law behind the changing shear strength of the soil with depth, and using the numerical simulation to identify the law underlying the temperature variation in soil slopes over 200 days ranging from freezing to all melting in the spring thawing period.The results demonstrate that the depth increase leads to an initial increase and a subsequent decrease in water content first;there is an initial decrease and a subsequent increase in the soil shear strength, and a basic saturation state in the soil at the melting interface of soil, suggesting a very low shear strength;and the the maximum slope frozen depth is followed by the melting from soil slope to the inside, until a failure in a certain depth.The research could provide a reference for the slope collapse control of soil cutting slope during spring thaw period.

关 键 词：土质边坡 冻融滑塌 边坡稳定性 数值模拟 

分 类 号：U416.13[交通运输工程—道路与铁道工程]