贵州印江岩口滑坡过程的数值模拟分析

Numerical simulation analysis of the process of Yankou landslide in Yinjiang River of Guizhou

在对贵州印江岩口滑坡工程地质背景资料和地质条件进行详细研究的基础上,利用离散元方法建立了滑坡的计算模型,对滑坡滑动的整个过程进行了仿真模拟,着重分析了滑坡后部点、中部点和前部点滑动位移与速度的变化规律以及滑坡的堆积形态,并与实测数据进行了对比。计算结果表明,根据位移和速度的变化,可把整个滑动过程分为4个阶段:即启动加速阶段、高速运动阶段、碰撞减速阶段和缓动夯实阶段;较准确的模拟了滑坡体的灾害影响范围和堆积规模;通过对滑体不同点位移和速度的分析,进一步明确了滑坡为牵引式滑坡和不同点在速度、位移和加速度上的变化规律。研究表明,对滑坡滑动过程的数值模拟可以进一步认清滑坡滑动和转化的本质,这将为合理治理滑坡、估算滑坡体对其下方建筑物的破坏范围和冲击破坏力以及灾害的合理评价提供基本依据。

On the basis of analyzing geological background data and engineering conditions of Yankou landslide, a discrete element model was set up to simulate the sliding process. The sliding distance and velocity of the back, middle and front parts of the landslide and the accumulation configuration of the landslide are simulated and compared with the measured data. The evolution process of landslide could be divided into 4 periods： beginning and accelerating period, quick-moving period, braking period and tamping period. The damage scope and accumulation extent are also simulated satisfactorily. The pulltype and mechanism of sliding process can be recognized by analyzing the distance, velocity and acceleration. The study shows that numerical simulation of sliding evolution would reveal the sliding mechanism and evaluate the damage extent. Some reasonable countermeasures can be worked out.