基于极限平衡条件的沟道泥石流启动条件研究  

ON INITIATION OF GULLY DEBRIS FLOW BY LIMIT EQUILIBRIUM ANALYSIS

作　　者：张国帅 王晓亮 夏建新[1] Zhang Guoshuai;Wang Xiaoliang;Xia Jianxin(College of Life and Environmental Sciences,Minzu University of China,Beijing 100081,China;Department of Mechanics,School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中央民族大学生命与环境科学学院,北京100081 [2]北京理工大学宇航学院力学系,北京100081

出　　处：《力学与实践》2019年第5期565-570,共6页Mechanics in Engineering

基　　金：自然科学基金资助项目(51339008,11432015和11602278)

摘　　要：沟道泥石流启动的力学本质为沟道中的堆积体所受剪切力克服摩擦力的过程。本文通过堆积体临界状态的受力平衡分析确立颗粒堆积体的临界平衡条件,发现堆积结构稳定性受坡度、颗粒内摩擦系数、堆积高度和水流速度共同作用。在此基础上通过文献中的系列实验数据分析拟合得到了一个泥石流启动的临界流速条件,相关结果和文献中的两个系列实验结果吻合良好,有望为沟道泥石流启动提供一定的支撑。The key mechanism of debris flow initiation in a channel is the process of shear force overcoming bed friction.In this paper,the critical equilibrium condition of particle deposit is established by limit equilibrium analysis,which shows the stability of deposit depends on slope angle,internal friction,deposit height and water discharge.Then through series analysis of experimental data in literature,a critical velocity criterion for initiation of gully debris flow is obtained.The criterion is in good agreement with two typical series of experimental results of debris flow,which might provide a useful tool for gully debris flow initiation.

关 键 词：有效摩擦系数 沟道泥石流 堆积体 启动条件 

分 类 号：P642.5[天文地球—工程地质学]