三峡库区沙溪镇堆积体滑坡变形特征

Accumulation Zone Landslides Deformation Feature of Shaxi Town in Three Gorges Reservoir Area

三峡库区存在大量堆积体滑坡,研究这些滑坡对库区地质灾害防治意义重大.本文在野外地质调查的基础上,利用大量滑坡监测数据,指出了反向堆积体滑坡与顺向堆积体滑坡具有不同的地质演化阶段,后期变形差别明显:顺层堆积体滑坡变形呈台阶状,前期与降雨和地下水埋深变化相关,后期主要与地下水埋深变化相关,变形特征明显滞后于降雨量的变化;反向堆积体滑坡变形专不具有台阶状的连续变形,主要与降雨量变化相关,与地下水位变化相关性很小,为降雨敏感性滑坡.

There are many accumulation zone landslides in Three Gorges Reservoir area, It is of great signifi- cance for prevention geology disasters to study the landslides. Based on the field geologic research and a large number of landslide monitoring data, we point out that the reverse landslide and consequent landslides exhibit different geological evolution stages, and the latter deformation characteristics are significantly different. At the beginning, landslide deformation characteristics are correlated to rainfall and changed groundwater table depth; in the latter period those are correlated to changed groundwater table depth only. Deformation charac- teristics are delayed the rainfall. The reverse landslide deformation features have no characteristics of step continuous deformation. It is correlated to rainfall mainly, and slightly correlated groundwater table variation for that it is rainfall sensitivity landslide.