各向异性成层边坡的稳定性分析  

Layered slope stability analysis considering anisotropy

作　　者：罗凌晖 周建[1,2] 蔡露 温晓贵 LUO Linghui;ZHOU Jian;CAI Lu;WEN Xiaogui(Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;Zhejiang Urban Underground Space Development Engineering Research Center, Hangzhou 310058, China;Suzhou Changhong Architecture Design and Research Institute, Suzhou 215000, China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江省城市地下空间开发工程技术研究中心,浙江杭州310058 [3]苏州常宏建筑设计研究院姑苏分公司,江苏苏州215000

出　　处：《中南大学学报（自然科学版）》2019年第8期1883-1890,共8页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2016YFC0800203);国家自然科学基金资助项目(51338009)~~

摘　　要：为研究土体强度各向异性对成层边坡稳定性的影响,基于空心圆柱扭剪仪(HCA)试验得到的杭州软黏土不排水抗剪强度,并结合土体破坏微观机理,得到考虑土体各向异性的不排水抗剪强度公式,推导出与其对应的屈服准则;采用有限元强度折减法分析各向异性成层边坡稳定性。研究结果表明:随着上、下层强度比的改变,失稳破坏时会产生3种不同的滑动面形式;当土体呈现较强的各向异性时,不考虑强度各向异性的影响会使边坡安全系数计算结果不准确。To study the influences of strength anisotropy on layered slope stability, a formula of anisotropic undrained shear strength and corresponding yield criteria was deduced based on the undrained shear strength of Hangzhou soft clay from hollow cylinder apparatus(HCA) test and microscopic failure mechanism of soil. The stability of anisotropic layered slope was analyzed by strength reduction method. The results show that with different strength ratios between the upper layer and lower layer, there are three types of mechanisms when failure occurs. The calculation results of slope safety factor tend to be inaccurate with no consideration of the influence of anisotropy when the soil exhibits strong anisotropy.

关 键 词：边坡稳定 各向异性 不排水抗剪强度 强度折减法 

分 类 号：TU47[建筑科学—结构工程]