PFC泥石流模拟.pdf

第 31 卷增刊 1 岩 土 力 学 Vol.31 Supp.1 2010 年 8 月 Rock and Soil Mechanics Aug. 2010 文章编号：1000－7598 (2010) 增刊 1－0394 －05 泥石流启动过程PFC 数值模拟 胡明鉴，汪 稔，陈中学，王志兵 （中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室，武汉 430071 ） 摘 要：泥石流松散碎屑物质具有散粒体的基本特征，在暴雨激发下容易形成泥石流，整个过程具有散粒体大变形的特征。 颗粒流理论是基于离散单元法模拟圆形颗粒介质的运动及其相互作用，在模拟颗粒相互作用和大变形问题研究方面具有显著 的优越性。为分析泥石流松散碎屑物质启动形成泥石流的过程及其与土体含水率的关系，采用二维颗粒流程序（PFC2D ）分 析降雨作用下松散碎屑物质启动形成泥石流的过程，揭示崩滑堆积体在降雨作用下含水率超过临界值后质点运动速度和位移 增加，松散碎屑物质启动并加速而导致滑坡泥石流连锁式破坏的过程和机制。 关 键 词：泥石流；松散碎屑物；颗粒流；临界含水率；启动 中图分类号：TV 144 ；O 241 文献标识码：A Initiation process simulation of debris deposit based on particle flow code HU Ming-jian, WANG Ren, CHEN Zhong-xue, WANG Zhi-bing (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China) Abstract: The mud-rock loosening deposit which has the basic character of granular mixtures is easily turning into debris flow if inspired by rainstorm. Based on the discrete element method and its superiority on round particles moving and mutually affecting and big distortion question research. In order to analyze the relationship between the moisture content and the process of loosening deposit forming in the mud-rock flow, this thesis simulated the process of loosening deposit turning into debris flow under condition of rainfall by using the two-dimensional particle flow code software-PFC2D. Result showed that the particle would start moving and accelerating then caused the displacement increasing, induced the chain destroy process and mechanism of landslide and debris flow when the water content surpassing the critical moisture content. Key words: deb