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工程科学与技术:2013,45(1):1-7
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泥石流颗粒的标度分布
李泳1,2, 谢江1,2,3, 周小军1,2, 郭晓军1,2,3
(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.中国科学院大学)
A Scaling Distribution for Grain Composition of Debris Flow
(1.Key Lab. of Mountain Hazards and Surface Processes,Chinese Academy of Sciences;2.Inst. of Mountain Hazards and Environment,Chinese Academy of Sciences;3.Univ. of Chinese Academy of Sciences)
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投稿时间:2012-11-30    修订日期:2012-12-04
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: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.
文章编号:201200966     中图分类号:    文献标志码:
基金项目:中国科学院重点部署资助项目(KZZD-EW-05-01);国家重点基础研究发展规划(2011CB409902);国家科技支撑计划资助项目(2012BAK10B04)
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引用文本:
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.
Li Yong,Xie Jiang,Zhou Xiaojun,Guo Xiaojun.A Scaling Distribution for Grain Composition of Debris Flow[J].Advanced Engineering Sciences,2013,45(1):1-7.