西南交通大学学报 2004, 39(1) 10-14 DOI:     ISSN: 0258-2724 CN: 51-1277/U

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泥石流
模型试验
交汇模式
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陈春光
姚令侃
杨庆华
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泥石流与主河水流交汇的试验研究

陈春光;姚令侃;杨庆华

西南交通大学土木工程学院,四川成都610031

摘要

分析了泥石流与主河交汇试验的模型相似律并进行室内模型试验,探索了泥石流与主河水流的交汇规 律.试验结果表明:交汇口支槽与主槽槽底之间的关系不同,泥石流入汇主槽后的运动形式也不同,大体可分为 潜入式交汇和分层交汇2种形式.潜入式交汇中,泥石流龙头速度近似按线性关系衰减,龙头几何特征与异重流 不同,它的高度与长度变化较小,横向宽度与长度可用线性关系表达;当支槽有回水时,泥石流头部受到水流的 破坏,发生沙、石沉降,形成分层运动.

关键词 泥石流   模型试验   交汇模式   模型相似律   

Experimental Research on Confluence between Debris Flow and Main River

CHENChun-guang;YAOLing-kan;YANG Qing-hua

School of Civil Eng., Southwest Jiaotong University, Chengdu 610031, China

Abstract:

Model similarity-rules for confluence between a debris flow and the main river were analyzed, and a series ofmodel experimentswere performed to investigate the regularityof confluence between a debris flowand the main river. The experimental result shows that the movement patterns of a debris flow are different in the intersection region for different relationships between the branch and the main river and can be divided the submerging flowand the stratification flow. In the submerging flow, the velocityof the debris flowhead, submerging intowater, decreases approximately linearly, the changes in its height and length are very small, and there is a linear relationship between the width and the length. All these are quite different from a density current. Furthermore, whenwater flows into the branch, the debris flowheadwill be broken bywater, resulting in the sedimentation of sand and stone. Under that condition, the debris flow entering into the river becomes a stratiform flow.

Keywords: model experiment   confluence mode   model similarity-rule    debris flow  
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