Study on the Mechanisms of Solids Segregation in Granular Debris Flows

doi:10.15961/j.jsuese.2013.01.005

您当前的位置：

首页 >

文章列表页 >

Study on the Mechanisms of Solids Segregation in Granular Debris Flows

更新时间：2023-11-14

- Study on the Mechanisms of Solids Segregation in Granular Debris Flows
- Advanced Engineering Sciences Vol. 45, Issue 1, Pages: 28-36(2013)
- 作者机构：
  
  1. 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
  2. 清华大学水沙科学与水利水电工程国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.15961/j.jsuese.2013.01.005
  CLC：
- Published：2013，
  
  Published Online：27 November 2012，
扫描看全文
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.

Study on the Mechanisms of Solids Segregation in Granular Debris Flows. [J]. Advanced Engineering Sciences 45(1):28-36(2013)
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. DOI： 10.15961/j.jsuese.2013.01.005.

Study on the Mechanisms of Solids Segregation in Granular Debris Flows. [J]. Advanced Engineering Sciences 45(1):28-36(2013) DOI： 10.15961/j.jsuese.2013.01.005.

摘要

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。

Abstract

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.

关键词

泥石流颗粒分选理论分析离散元模拟

Keywords

debris flowsegregationtheoretical analysisdiscrete element method

references

更多指标>

Views

下载量

CNKI被引量

Alert me when the article has been cited

提交

Tools

Publicity Resources

Regulation Performance of Debris Flow by “Step+ Baffle” Drainage Channel

Dynamic Response Analysis for Debris Flow Dam with Sediments

Regulation Effect of Herringbone Water-sediment Separation Structure on the Substance and Energy Properties of Debris Flow

Research of Small Caliber Steel Pipe Piles to Reinforce the Foundation of Check Dam and Preventit from Scouring by Debris Flow

Eroding Characteristics of Landslide Dams in Debris Flow Gullies After Earthquakes—Case Study of Yindongzi Landslide Dam

Related Author

No data

Related Institution

Center for Excellence in Tibetan Plateau Earth Sci., Chinese Academy of Sciences

Univ. of Chinese Academy of Sciences

Lab. of Mountain Hazards and Surface Process, Chinese Academy of Sciences, Chengdu

Inst. of Mountain Hazards and Environment, Chinese Academy of Sciences

Lab. of Mountain Hazards and Surface Process, Chinese Academy of Sci., Chengdu

⁰