杨家塝缓倾岩质滑坡破坏机理及稳定性评价

Failure Mechanism and Stability Evaluation of Gently Dipping Rock Landslide

以四川省杨家塝缓倾岩质滑坡为例,从滑坡各特征要素的角度,分析了该类滑坡的变形破坏机制,并采用GeoStudio建立稳定性数学模型,利用Slople模块对比分析了该滑坡在不同降雨条件下的稳定性状态。结果表明,缓倾岩质滑坡的变形破坏受多种因素共同作用,而降雨是其主要的诱发因素;降雨对滑坡前缘稳定性的影响大于滑坡后缘,且滑坡稳定性的削弱在不同降雨时期表现出不同的特点,即降雨前期对滑坡稳定性的削弱程度最大,其次是降雨后期,降雨中期对滑坡稳定性削弱程度最小。

Taking gently dipping rock landslide of Yangjiabang in Sichuan Province for an example,we analyze the deformation and failure mechanism based on various elements of landslide features.And then GeoStudio is used to establish landslide stability model.Finally,slople module is adopted to analyze landslide stability under different rainfall conditions.The results show that the deformation and failure of landslide was caused by many factors while the rainfall is the main induction factors;the impact of rainfall on the leading edge of stability is larger than that of trailing edge;the reduction of landslide stability exhibits different characteristics at different rainfall period,namely,antecedent rainfall weakened the maximum degree of landslide stability,followed by later period of rainfall while medium-term of rainfall weakened the minimum degree of landslide stability.