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  

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

作　　者：刘思杰[1] 李昊承 LIU Sijie1, LI Haocheng2(1. School of River ＆ Ocean Engineering , Chongqing Jiaotong University, Chongqing 400074, China ; 2. Planning and Design Branch of Sichuan Province Institute of Water Resources and Hydro-electric Engineering Investigation and Design, Deyang 618000, Chin)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]四川省水利水电勘测设计研究院规划设计分院,四川德阳618000

出　　处：《水资源与水工程学报》2017年第6期209-214,共6页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51479014)

摘　　要：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。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.

关 键 词：碎屑粒径 高位滑坡 离散元 数值模拟 速度 碎屑流动 运动特性 

分 类 号：P642.22[天文地球—工程地质学]