陕西省阳庄村滑坡成因机制及其稳定性分析

Analysis of the genetic mechanism and landslide stability in Yangzhuang Village,Shaanxi

为评价陕西省阳庄村滑坡的稳定性,在对阳庄村北部山体进行工程地质勘察和测试分析工作的基础上,首先分析了该滑坡体特征及其成因机制,认为该滑坡为黄土层内发育的多层滑坡,根据地貌特征划分为三级台阶,滑坡滑动面位于更新统黄土层内;其次利用Geo-Studio分析软件构建滑坡稳定性计算模型,采取三种不同的极限平衡法,分别评价了不同工况条件下滑坡的稳定性。研究结果表明:滑坡在天然条件下处于基本稳定的状态,计算得出的滑坡安全系数为1.052~1.087;如遇降雨使土体达到饱和状态,则会大大降低滑坡稳定性,其安全系数下降为0.821~0.895,降幅达22%,极易发生滑塌。

In order to evaluate the landslide stability in Yangzhuang Village,Shaan’xi Province,on the basis of the engineering geological investigation and test analysis of the northern mountain in Yangzhuang Village,this article has analyzed the landslide characteristics and genetic mechanism.The landslide is considered as a multilayer landslide developed in loess layer.There are three steps on the landslide and the sliding surface is located in the Pleistocene loess layer.Geo-Studio analysis software is used to build a landslide stability calculation model.Three different limit equilibrium methods are adopted to evaluate the landslide stability under different working conditions.The result shows that the landslide is basically stable under natural condition,and the calculated safety factor of the landslide is 1.052-1.087,if the soil is saturated by rainfall,the stability of the landslide will be greatly reduced,and its safety factor will decrease to be 0.821-0.895 with a drop of 22%,and the landslide is very easy to slip and collapse.