摘要
首先对民国场滑坡的基本特征进行了调研,结果表明民国场滑坡是一个大型的顺层滑动的基岩滑坡,滑动方式为牵引式。然后对民国场滑坡的形成影响因素进行分析,认为顺坡向、中等倾角的地质结构及岩层中的炭质页岩是民国场滑坡形成的内在条件,河流切割和人工活动是滑坡形成的外部因素,暴雨是直接诱发因素。着重用反分析方法对暴雨影响滑动面的抗剪强度进行了定量分析,结果表明,与一般页岩层面的抗剪强度的最低值相比,粘聚力降低了24.8 kPa,摩擦角降低了3.3°。
This paper described the basic characteristics of Minguochang landslide in detail. The results showed that it was a gigantic dragged landslide which slipped along the stratal surface of the carbonaceous shale. Then, the factors affecting the landslide were analyzed. It was considered that the geological features that the dip direction of strata is in the same direction wiht that of the slope and the slope-formingg material is carbonaceous shale are the internal factors causing the landslide. River erosion and human activity are the external factors. And fianally, the rainstorm directly triggered the landslide. The effect of the rainstorm on shear strength of the slip surface was calculated by back analysis method, and the results showed that the cohesion was 24.8 kPa less and the friction angle is 3.3° less when compared with the minimum value of usual shale strata surface.
出处
《安全与环境工程》
CAS
2005年第3期95-98,共4页
Safety and Environmental Engineering
关键词
万州区铁峰乡
民国场滑坡
基本特征
暴雨诱发机制
反分析
Tiefeng Town of Wanzhou District
Minguochang landslide
characteristics
rainstorm-triggering mechanism
back analysis
