基于MatDEM的烟家沟滑坡演化过程数值模拟分析

在对陕西省山阳县烟家沟滑坡基本地质特征调查的基础上，利用无人机获取滑坡高程数据，基于高性能矩阵离散元软件MatDEM建立起烟家沟滑坡运动及堆积特征的三维离散元模型，还原了滑坡启动发生的全过程，最终得到了运动速度、滑移距离以及堆积体厚度3个方面特征，取得以下认识：烟家沟滑坡属于高速滑坡；滑坡运动堆积过程分为加速碰撞堆积阶段、整体滑动堆积阶段和减速堆积阶段；其堆积层厚度分布沿运动方向呈现出先增加后减小的总体变化趋势，且堆积厚度在堆积体后部达到最大；MatDEM矩阵离散元法用来模拟滑坡演化过程具有可行性.

MatDEM-BASED NUMERICAL SIMULATION ANALYSIS OF YANJIAGOU LANDSLIDE EVOLUTION PROCESS

Through the investigation on the basic geological characteristics of Yanjiagou landslide in Shanyang County of Shaanxi Province,the paper obtains landslide elevation data by means of drone,and establishes a MatDEM-based 3D discrete element model of the landslide movement and accumulation features,which restores the whole process of landslide occurrence and gains the characteristics of movement velocity,sliding distance,and accumulation thickness.It is considered that the Yanjiagou landslide is of high-speed type.The landslide accumulation process is divided into three stages:accelerated collision→overall sliding→deceleration accumulation.The distribution of accumulation thickness shows a general trend of increasing first and then decreasing along the movement direction,reaching the maximum at the back of accumulation body.It is proved that MatDEM is feasible to simulate the landslide evolution process.