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震区急陡沟道泥石流特征及起动过程分析
投稿时间:2018-12-06  修订日期:2019-03-15  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2019146
摘要点击次数: 159
全文下载次数: 112
作者单位E-mail
李宁 成都理工大学 790626903@qq.com 
唐川 成都理工大学  
龚凌枫 成都理工大学  
杨成长 重庆市地质矿产勘查开发局南江水文地质工程地质队  
陈明 成都理工大学  
甘伟 成都理工大学  
基金项目:国家重点基础研究发展计划(973计划),国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:急陡沟道泥石流是汶川震区发现的一类特殊泥石流,调查发现其具有物源量大、侵蚀强烈,冲出规模大等特点,是震区地质灾害治理的难点。本文以汶川县典型急陡沟道泥石流福堂沟为原型,分析了其发育条件和特征,并通过模型试验等手段,还原并分析了急陡沟道泥石流起动及形成的过程,以及相应的土体内部参数变化特征。试验显示在20°、25°、30°的坡度和480ml/s、410ml/s、360ml/s的径流量的试验条件下,泥石流分别以不同的方式起动(沟床侵蚀型、滑坡流态化起动型、消防管起动型),同时结合实验过程中土体内部孔隙水压力及体积含水率变化特征的研究,详细还原了相应的泥石流起动全过程。试验数据的分析结果显示,在不同的起动方式下,土体内部的数据变化表现出不同的特征:其中,不同试验条件下的泥石流起动孔隙水压力呈现出规律性差异,即水槽坡度、径流量越大,泥石流所需的起动力越小;此外,坡度越大,土体所需的饱水时间越长,而在相同坡度下,流速越大,预饱水时间越短;研究还发现,泥石流的爆发时间与沟床坡度呈反比,并且径流量越大,泥石流持续时间也越长。基于实验结果,通过相似理论计算得到的泥石流起动流速,与实际情况一致,表明本的研究结论可为汶川震区急陡沟道泥石流的研究提供参考。
中文关键词:急陡沟道泥石流,物理模拟实验,起动模式,力学机理
 
CHARACTERRISTICS AND PRELIMINARY STARTING EXPERIMENT STUDY OF STEEP-CHANNEL DEBRIS FLOW IN THE EARTHQUAKE AREA
Author NameAffiliationE-mail
li Ning Chengdu University of Technology 790626903@qq.com 
Tangchuan Chengdu University of Technology  
Gong Lingfeng Chengdu University of Technology  
Yang Chengzhang Nanjiang Hydrogeological& Engineering Geology Brigade  
Chen Ming Chengdu University of Technology  
Gan Wei Chengdu University of Technology  
Abstract:The steep-channel debris flow is a kind of special debris flow in Wenchuan earthquake zone, and it is found that has the characteristics of large source quantity, strong erosion and large scale, which is the difficulty of geological disaster management in the earthquake area. This paper taking the Futang gully as the study area, analyze the development condition and characteristics of the steep-channel debris flow, then reappeared and analyzed the starting process of steep-channel debris flow by the means of experiments. The test shows that under the test conditions of the slope of 20°, 25°, 30° and the runoff of 480ml/s, 410ml/s and 360ml/s, the debris flow is starting in different ways (trench bed erosion type, landslide fluidization starting type, Fire pipe starting type). At the same time, combined with the study of the variation characteristics of pore water pressure and volume moisture content in soil during the experiment, the whole process of debris flow starting was restored in detail. The analysis results of the test data show that under different starting modes, the data changes inside the soil show different characteristics: 1, the starting pore water pressure of debris flow under different test conditions shows regular difference, that is, the larger the slope and runoff of the sink, the smaller the driving force required by the debris flow, 2, the larger the slope, the longer the water saturation time required by the soil, and at the same slope, the greater the flow rate, the shorter the pre-water saturation time, 3, the outbreak time of debris flow is inversely proportional to the slope of gully bed, and the larger the runoff, the longer the duration of debris flow. Based on the experimental results, the starting velocity of debris flow calculated by the similarity theory is consistent with the actual situation, which shows that the conclusion of this study can provide reference for the study of the rapid and steep channel debris flow in Wenchuan earthquake area.
keywords:Steep-channel debris flows,physical simulation experiments,starting mode,mechanical mechanism
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