基于不连续变形方法的滑坡动力学过程研究

Research of Landslide Dynamics Process Based on Discontinuous Deformation Method

水库蓄水是导致库岸发生滑坡的主要触发因素,并对水库的安全运行产生重要的影响。为了揭示库岸滑坡灾害的触发及变形机制,采用DDA方法对西南地区某库区内古滑坡体的启动和动力学过程进行了数值模拟研究。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,模拟了滑坡启动、发展的渐进破坏过程以及蓄水触发滑坡后的运动情况。DDA模拟结果表明,滑坡是以斜坡坡脚的局部破坏以及滑体前缘的表层拉裂为其运动的开始阶段,并进一步牵引上部滑体,在水库蓄水和强降雨的联合作用下最终触发滑坡产生整体滑动。

Reservoir Storage is not only the main cause of landslide of bank but it also has a severe effect on the safety of reservoir.In order to reveal the strike of bank landslide disaster and deformation mechanism,we use DDA method to do numerical simulation researches on a landslide launching and dynamic process in some reservoir in southwest area.According to its geological and topographical characteristics,we divide them based on different soil-rock mass and geological discontinuities,simulate the process of how landslide starts,develops,and damages banks.DDA method suggests that landslide begins from the destruction of some parts of the slope bottom and pull cracks of some front surfaces,which further pulls and drags upper slip mass.Together with the storage water and strong rainfall,whole landslide strikes.