三峡库区某滑坡变形影响因素分析

根据三峡库区某滑坡5年左右的GPS位移监测以及降雨量、库水位监测数据,选取降雨和库水位两个因素研究了其对滑坡变形的影响。结果表明:降雨的入渗增加了滑体重量、软化了岩土体、润滑了滑带与滑床的接触面,会降低滑坡的稳定性;库水位的上升一般对岩土堆积层滑坡的稳定性无明显不利影响,而其下降却使滑坡变形加速;两者对滑坡变形的影响均表现出一定的"滞后效应",滞后期一般为5~10 d。

Affecting Factors of Deformation of a Certain Landslide in the Three Gorges Reservoir Area

The paper studies the influence of the rainfall and the reservoir water level to landslide deformation based on the monitoring datas of the rainfall,the reservoir water level and the displacement dates by GPS of a certain landslide in the Three Gorges reservoir area for about 5-year.The outcomes show that the rainfall infiltration increases the weight of slide mass,softens the rock mass,lubricates the contact face of slide zone and slide bed and decreases the stability of landslide;usually the increase of reservoir water level would not have notable unfavorable effects to the stability of landslide,but the decrease will speed up landslide deformation;The influence of the two facors above to landslide deformation shows "hysteresis effect",and the lag period is about 5~6 days.