A Scaling Distribution for Grain Composition of Debris Flow

doi:10.15961/j.jsuese.2013.01.002

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A Scaling Distribution for Grain Composition of Debris Flow

更新时间：2023-11-14

- A Scaling Distribution for Grain Composition of Debris Flow
- Advanced Engineering Sciences Vol. 45, Issue 1, Pages: 1-7(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. 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中国科学院大学
- 作者简介：
- 基金信息：
- DOI：10.15961/j.jsuese.2013.01.002
  CLC：
- Published：2013，
  
  Published Online：4 December 2012，
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李泳,谢江,周小军,郭晓军.泥石流颗粒的标度分布[J].工程科学与技术,2013,45(1):1-7.

A Scaling Distribution for Grain Composition of Debris Flow. [J]. Advanced Engineering Sciences 45(1):1-7(2013)
李泳,谢江,周小军,郭晓军.泥石流颗粒的标度分布[J].工程科学与技术,2013,45(1):1-7. DOI： 10.15961/j.jsuese.2013.01.002.

A Scaling Distribution for Grain Composition of Debris Flow. [J]. Advanced Engineering Sciences 45(1):1-7(2013) DOI： 10.15961/j.jsuese.2013.01.002.

摘要

中文摘要: 大多数泥石流由宽粒径颗粒组成，粒径介于10^–3~10^2mm。通常以个别特殊粒径（如D10、D30、D50等）或其组合（如均匀系数、曲率系数等）来刻画颗分的性质，但这些都是经验性参数，没有明确的物理意义，也不能确定颗分曲线的函数形式。选取蒋家沟典型黏性泥石流流体样本和国内各泥石流多发区泥石流堆积土体样本，通过粒度分析，运用Matlab和函数逼近方法，发现泥石流颗粒普遍满足一种标度分布：P(D)=CD^-μexp(-D/Dc)，因而颗分性质可以用自然参数μ和Dc来刻画。μ刻画了土体在自然状态下的孔隙度，Dc是一个特征粒径，代表颗粒组成的范围。根据蒋家沟大量泥石流样本发现，μ<0.10，而对高容重泥石流，μ<0.05。泥石流容重随Dc呈幂函数增长，Dc从而刻画了泥石流的输移能力。由此确立了分布参数与泥石流性质的关系，并将其用于汶川震区泥石流的评估。全文下载地址

Abstract

Abstract:Based on soil samples from living debris flows in Jiangjia Gully and deposits of debris flows in various valleys and regions in China

a general form of grain size distribution

P(D) =CD^-μexp(-D/Dc)

which fitted the soils of debris flows perfectly and universally was proposed.The values of μ and Dc were used to describe the nature of grain composition

where the power exponent represents some characteristic porosity of the soilin natural condition

and Dcdefines a characteristic scale for the range of grains.According to soil samples of debris flow from various sources

μ is less than 0.1

and for high density debris flow

μ is less than 0.05.The bulk density of debris flow increases with Dcin a power law. So the parameter Dc can depict the power of the transportation of debris flow. Finally

the parameters were used to evaluate the debris flows occurred in the Wenchuan earthquake area

which agrees well with the observations in Jiangjia Gully.

关键词

泥石流颗分曲线标度分布分布参数泥石流评估

Keywords

debris flowgrain distribution curvescaling distributiondistribution parametersdebris flow evaluation

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Related Institution

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