泥石流颗粒物质分选机理和效应

周公旦; 孙其诚; 崔鹏

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DOI:10.15961/j.jsuese.2013.01.005

工程科学与技术:2013,45(1):28-36

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泥石流颗粒物质分选机理和效应

周公旦^1,2, 孙其诚³, 崔鹏^1,2

(1.中国科学院山地灾害与地表过程重点实验室;2.中国科学院水利部成都山地灾害与环境研究所;3.清华大学水沙科学与水利水电工程国家重点实验室)

Study on the Mechanisms of Solids Segregation in Granular Debris Flows

Zhou Gongdan^1,2, Sun Qicheng³, Cui Peng^1,2

(1.Key Lab. of Mountain Hazards and Earth Surface Processes,Chinese Academy of Sciences;2.Inst. of Mountain Hazards and Environment,Chinese Academy of Sciences & Ministry of Water Conservancy;3.State Key Lab. for Hydroscience and Eng.,Tsinghua Univ.)

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投稿时间：2012-11-23 修订日期：2012-11-27

中文摘要: 泥石流是一种由大量固体颗粒和液态水充分掺混所形成的多相流体,泥石流体内固体颗粒物质的相互作用所导致的泥石流颗粒物质的分选是引起泥石流流动性和冲击力大增的重要原因，是现阶段大型泥石流防治的重要关注方向。从基本的泥石流动力学理论出发，采用连续介质力学的方法构建泥石流运动的模型，初步分析颗粒分选对泥石流流动性的影响；进而采用离散元（DEM）数值模拟颗粒流的方法，对泥石流发展过程中颗粒间的作用方式和分选机理开展详尽的研究。研究结果表明:泥石流颗粒分选可以导致颗粒体内部孔隙水压力的重新分布，进而影响到龙头运动速度和颗粒体长度的激增；离散元数值模拟和分析进一步显示，区别于一般均匀颗粒所形成的颗粒流的边界层效应，颗粒分选能够显著地改变颗粒体内部的剪切速率的分布，从而弱化边界层效应。

中文关键词: 泥石流颗粒分选理论分析离散元模拟

Abstract:Debris flow is generally composed of a wide range of solid particles and viscous pore fluid. Interactions between solid particles and the resulted segregation in debris flows are affected by multiple parameters,and usually govern the rheological properties of debris flows and the flow mobility.Through the theoretical analysis,the effect of solids segregation on the flow mobility was demonstrated.Furthermore,granular debris flows with grains of mixed sizes were numerically modelled and the contact behaviour of solid particles was fundamentally studied using the Discrete Element Method (DEM).Compared to granular flows with uniform solid particles,the mechanisms of solids segregation and the effect on granular flow mobility were investigated.The results showed that that segregation can significantly increase the flow velocity of the front head and the length of the granular body on slopes.Due to the solids segregation,the shear rate developed in the granular body is greatly enhanced and no shearing-enhanced boundary layers near the sloping bed can be observed.

keywords: debris flow segregation theoretical analysis discrete element method

文章编号：201200928 中图分类号： 文献标志码：

基金项目:四川青年基金资助项目（2012JQ0043）；四川省交通科技项目（2011C17-3-2）；交通运输部科技项目（2009318797029）；中国科学院水利部成都山地灾害与环境研究所“青年百人”资助项目

作者	单位
周公旦	中国科学院山地灾害与地表过程重点实验室；中国科学院水利部成都山地灾害与环境研究所
孙其诚	清华大学水沙科学与水利水电工程国家重点实验室
崔鹏	中国科学院山地灾害与地表过程重点实验室；中国科学院水利部成都山地灾害与环境研究所

Author Name	Affiliation
Zhou Gongdan	Key Lab. of Mountain Hazards and Earth Surface Processes,Chinese Academy of Sciences Inst. of Mountain Hazards and Environment,Chinese Academy of Sciences & Ministry of Water Conservancy
Sun Qicheng	State Key Lab. for Hydroscience and Eng.,Tsinghua Univ.
Cui Peng	Key Lab. of Mountain Hazards and Earth Surface Processes,Chinese Academy of Sciences Inst. of Mountain Hazards and Environment,Chinese Academy of Sciences & Ministry of Water Conservancy

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引用文本：
周公旦,孙其诚,崔鹏.泥石流颗粒物质分选机理和效应[J].工程科学与技术,2013,45(1):28-36.
Zhou Gongdan,Sun Qicheng,Cui Peng.Study on the Mechanisms of Solids Segregation in Granular Debris Flows[J].Advanced Engineering Sciences,2013,45(1):28-36.