降雨诱发黄土边坡失稳室内试验研究  

Model test study of loess slope instability induced by rainfall

作　　者：周杨[1] 刘果果[1] 白兰英[1] 石伦炎 吴礼舟[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点试验室,四川成都610059

出　　处：《武汉大学学报（工学版）》2016年第6期838-843,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助项目(编号:41472296;41272005)

摘　　要：为研究降雨诱发滑坡失稳破坏机理和演化特征,开展了人工降雨条件下黄土滑坡室内研究,通过对土体的体积含水率、基质吸力及坡体变形破坏监测,分析降雨入渗对黄土边坡稳定性的影响.结果表明:在一定的降雨强度范围内,降雨强度越大,降雨入渗速度越快,越易发生滑坡;边坡坡度越缓,坡面降雨入渗速度越快;湿润锋移动在坡脚和坡顶较坡面更快,对滑坡的发生发展有较大影响;试验滑坡为多级后退式破坏模式.The indoor research of loess landslide under artificial rainfall condition is carried out to study the rainfall induced landslide failure mechanism and development characteristics. The volume moisture con- tents and rnatric suctions of the soil and deformation or damage degree of slope are monitored to analyze the influence of rainfall infiltration on loess slope stability. The results show that in a certain range of rainfall intensity, the greater the rainfall intensity the faster the infiltration, and the more prone to landslides. The smaller the gradient of slope surface, the faster the infiltration. The wetting front movement in the slope toe and shoulder faster than in the surface, which has great influence on the occurrence and develop- ment of landslide. The process of the landslide development is that local failure in the slope toe gradually developed upward to the shoulder, forming the traction sliding step by step and eventually structural failure.

关 键 词：黄土滑坡 降雨入渗 模型试验 

分 类 号：P642.1[天文地球—工程地质学]