超厚滑坡稳定性数值分析  

Numerical Analysis of Stability of Super-thick Landslide

作　　者：王秀丽[1,2] 陈美合 于光明[1,2] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《甘肃科学学报》2016年第1期83-87,共5页Journal of Gansu Sciences

基　　金："十二五"国家科技支撑计划项目(2011BAK12B07)

摘　　要：以锁儿头滑坡工程为背景,探讨其稳定性,并研究滑带土的摩擦角及内聚力对超厚滑坡安全系数的影响。结果表明:采用强度折减法计算安全系数与采用不平衡推力法的计算结果基本一致,二者误差不超过5%,说明所建立H0-2-2滑坡数值分析模型是可靠的;滑坡后壁局部滑塌,与实际勘测结果一致;滑坡属于推移式滑动,发生剪切破坏的潜在位置在滑坡体中段及后端;安全系数随着摩擦角及内聚力的增大而增大,摩擦角增大70%时,安全系数增大5.4%,内聚力增大70%时,安全系数增大10.7%,且后者对安全系数的影响比前者大。Against the background of Suoertou landslide project,this paper discussed its stability,and studied the impact of friction angle and cohesion of slide zone soil on the safety factor of super-thick landslide.Research results showed that：the safety factors that respectively calculated with strength reduction method and imbalance thrust force method are basically consistent,with an error less than 5%,indicating that the established H0-2-2landslide numerical analysis model is reliable;the back scarp locally slumps,and this is consistent with the actual survey results;the landslide belongs to push-type sliding,so the potential area of shear failure is in the middle and rear part of the landslide mass;the safety factor increases with the increasing of friction angle and cohesion,with 70%increase of friction angle leading to a 5.4%increase of safety factor,and a 70%increase of cohesion leading to a 10.7%increase of safety factor,and the latter has a large impact on safety factor than the former.

关 键 词：超厚滑坡 稳定性 安全系数 摩擦角 内聚力 

分 类 号：TU44[建筑科学—岩土工程]