金江滑坡成因离散元模拟

Simulation of the formation of Jinjiang landslide by DEM

在对金江巨型滑坡的工程环境条件及现今坡体物质组成、自身结构及变形破坏特征等方面调查研究的基础上,宏观判断滑坡为整体式滑移-弯曲破坏模式。为直观反映滑坡变形破坏的过程,根据对滑坡区基岩结构特征的分析,采用离散元软件2D_Block对滑坡成因机制进行模拟。根据滑坡普遍发育的地形地貌特征,恢复滑坡区原始斜坡地形,根据岩体结构划分模型计算单元,将地震效应考虑进2D_Block模型参数中。通过计算,展现了滑坡的发展演化过程,并将其分为三个阶段,即轻微隆起阶段、强烈隆起阶段、滑面贯通剪出阶段。

The advantages of discrete element method （DEM） are introduced first and it is applied to simulate a real case of Jinjiang landslide. On the mean while, resuming original landform of the landslide zone based on the rock structure, the geological model is built up and the effect of earthquake is considered into the parameters of the rock. By computing, the evolution process the landslide is exhibited visually. The results suggest that the evolution process of landslide can be divided into three stages, i.e. slight hunch stage, intensive hunch stage and transfixion and fast slippage stage.