库水位升降与降雨是库岸滑坡发生的主要诱因。以三峡库区塘角村2号滑坡为例，在室内建立了滑坡地质力学模型。试验结果表明：水库水位升降对滑坡前缘涉水部分影响较大，对中部和后缘影响较小；降雨对滑坡前缘、中部、后缘影响相对显著，主要表现在土压力及孔隙水压力与降雨过程呈现同步并略滞后于降雨的特征；降雨及库水位变化联合作用下，前缘变形破坏最大，前缘部分的变形破坏牵引中部发生变形。%Reservoir water level fluctuation and rainfall are the major reason that induces the reservoir bank landslide oc-currence, physical model can simulate the whole process of deformation and failure of landslide. Taked No.2 of Tangjiao-cun landslide in Three Gorges Reservoir Region for an example, developed geomechanics modeling for the landslide, and carryed out landslide physical model test with two engineering conditions. Experimental results show that reservoir water level fluctuation will obviously influence leading edge, it is less significant effect for central and trailing edge. Three parts significantly affected by rainfall, the main properties of three parts are soil press and pore water pressure present synchro-nization and slightly lagged behind the rainfall. Under the combined effects of the reservoir water and rainfall , leading edge occurred severely deformation,the deformation of central is dragged by leading edge.
展开▼
