三角带滑坡稳定性对极端气候的响应

The Response of Landslide Stability to Extreme Climate in Triangle Area

三角带滑坡是典型的久治不愈滑坡,随着三峡库区蓄水,三角带滑坡呈现古滑坡的复活和新滑坡的形成双重变形,极端气候必定会对其稳定性产生影响。本次研究选取三角带滑坡的深层滑面、浅层滑面及高焦炉古滑坡的滑面为对象,对4种工况下的滑坡稳定性进行评价。评价结果表明:(1)在洪水和暴雨极端条件下,高焦炉古滑坡各剖面均处于稳定状态;三角带滑坡浅层滑面由基本稳定向欠稳定状态转变,局部出现不稳定状态;三角带滑坡深层滑面由基本稳定向欠稳定状态变化;(2)通过φ值与c值参数敏感性比较分析可以看出,φ值对滑坡稳定系数的敏感性较大;(3)综合分析结果表明,三个滑坡稳定性评价结果为:三角带滑坡深层滑面<三角带滑坡浅层滑面<高焦炉古滑坡,且在暴雨和洪水极端气候的双重影响下均发生一定的稳定性下降现象。

Landslide in triangle area is a typical one in Three Gorges,the storage water in reservoir will arouse the resurrection of landslide,especially under extreme weather conditions,therefore,landslide stability evaluation under 4 conditions has been performed,and the results show that：（1） Under extreme conditions of floods and rainstorm,high coke ancient landslides are in a stable state of each section;shallow landslide of triangle area changes from steady-state to less stable and unstable state locally;deep landslide in triangle area changes from steady-state to less stable;（2） The parameter sensitivity analysis show that,the φ has higher sensitivity than c values;（3） The comprehensive analysis of the stability evaluation results show that the deep landslideshallow landslidehigh coke ancient landslide,and the stability evaluation under extreme climate,such as flood and rainstorm,has certain decline phenomenon.