岩屑组成对高位滑坡-碎屑流运动特性影响离散元模拟研究

采用三维颗粒离散元模拟方法,对4种由不同粒径碎屑颗粒组成的岩屑滑坡运动过程进行全程数值模拟,研究了碎屑粒径组成对于岩石碎屑滑坡的运动特性影响。结果表明:碎屑颗粒粒径组成对岩石碎屑滑坡的运动总时间和达到速度最大值的时刻没有影响;物源碎屑粒径的组成对滑坡运动速度、破坏力和滑动距离影响大。粒径组成越不均匀,滑坡运动速度和破坏力越大,滑动距离也越远;碎屑流物源前缘部分是滑坡-碎屑流灾害影响范围大小的控制性因素。成果可为岩石碎屑滑坡灾害的预测和评估提供参考。

Discrete element simulation study on movement characteristics influence of debris composition on high rock landslide debris flow

A three-dimensional discrete particle simulation method was used to simulate the movement of debris landslides composed of four different types of debris particles. The effects of particle size on the movement characteristics of rock debris landslides were studied. The results show that the particle size distribution of debris particles has no effect on the total movement time of rock debris landslide and the moment of reaching the maximum velocity. The composition of debris particle size has a great influence on the landslide moving velocity, destructive force and sliding distance. The more inhomogeneous the particle size distribution is, the greater the velocity and destructiveness of landslide and the longer the sliding distance is. The leading edge of the debris flow source is the controlling factor for the magnitude of the impact of the landslide-debris flow hazard. The research results can provide reference for the prediction and evaluation of rock debris landslide disasters in the future.