千将坪滑坡动力学过程仿真模拟

滑坡体的失稳破坏是一个动态过程，动力学行为起着非常重要的作用。采用DDA方法对长江三峡库区千将坪滑坡的运动全过程进行了数值模拟研究。模拟方案充分依据该滑坡的地质、地形特征，按不同岩土体和地质结构面类型进行块体单元划分，模拟了滑坡发生、发展的渐进破坏过程以及滑坡触发后的运动情况。模拟结果表明，千将坪滑坡是以斜坡坡脚的局部破坏为其运动的开始阶段，并进一步牵引上部滑体，在地下水压力作用下最终产生整体滑动。

DDA simulation of Qianjiangping landslide movement

Kinematics plays a very important role in the behavior of landslides in discontinuous media. Discontinuous Deformation Analysis (DDA) is applied to simulate the whole movement process of Qianjiangping landslide located in the area of Three Gorges Reservoir. The simulation scheme is mostly based on the characters of geology and landform; and the mesh of elements is based on different types of rock and geological joints. The gradual failure and the movement process after sliding are simulated, all of which are in the working conditions of reservoir impoundment and rainfall. The results of simulation indicate that the local failure in the toe of the slope is the beginning of the Qianjiangping landslide; and it gives a further dragging on the upside sliding body; and finally the landslide is triggered by groundwater pressure.