雅砻江上游某巨型滑坡成因机制及稳定性评价

Analysis of the Origin Mechanism and Stability Evaluation to Some Giant Landslide in Upper Course of Yalong River

通过对位于雅砻江上游的某巨型滑坡的实地调查,对其成因机制进行分析,滑坡是顺层蠕动-滑移-弯曲变形长期发展的结果,目前滑坡上的变形迹象是滑体土蠕滑-拉裂的产物。在对滑坡进行定性分析的基础上,选取安全储备明显较低的A2区,对其在天然、暴雨和地震三种工况下的整体和局部稳定性分别进行了计算分析,并对整体稳定性进行评价,结果表明A2区在天然工况下整体稳定性较好,在暴雨工况下稳定性较低,地震条件下稳定性会更低。

According to analysis of some giant landslide in upper Yalong river ,it belongs to the creep-sliding-bending type, At present ,in the landslide distortion sign is the slippery body earth creep-tension. In this foundation, the selection of safety mar- gin obviously is lower A2 area, carried on the appraisal to it under the different conditions stability, the results indicated A2 area is better under the natural condition, could not satisfy the safety request under the rainstorm condition, the earthquake condition can be lower.