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投稿时间：2015-01-12 修订日期：2015-07-17
投稿时间：2015-01-12 修订日期：2015-07-17
中文摘要: 针对两相泥石流的非恒定运动过程展开试验，研究了间歇流动的形成发展过程，通过分析建立了相应的力学模型。结果发现：两相泥石流的运动过程具有明显的间歇特征，龙头的运动和停滞呈间歇式分布。泥石流在停滞过程中，水流或泥沙悬浮液携带石块在前部堆积使得龙头高度和坡度逐渐增大，当坡度达到临界值时，泥石流向下游运移，龙头高度和坡度进而减小；当龙头坡度减小到一定值时，泥石流进入下一个停滞阶段，等待上游泥沙的补给和能量的聚集。两相泥石流龙头后部水流断面平均速度>颗粒断面平均速度>龙头速度，水流速度是颗粒速度的2～3倍，水流通过颗粒不断将能量传递给龙头用来克服龙头相对较大的阻力。
Abstract:Debris flows were classified into one-phase and two-phase flows according to their movement features and the size distributions of solid particles.The intermittent feature of two-phase debris flows was studied with the natural and physical model experiments.The surge character in the experiments of the two-phase debris flow was obvious, and the head of the debris flow moved intermittently.In the experiment water flow initiated sediment from bed and side slopes and transported gravel particles to the front,accumulation of the gravel in the front of the flow made the height and front slop of the debris flow increase.Suddenly,the gravel moved forward as the slop reaches the critical value.Then the head height and slope reduced to some value and the flow stag again.The sediment supplied from upstream and energy accumulation caused the debris flow moving again. Based on the two-phase debris flow experiments,the formation and development of intermittent surges process was studied and the mechanical model was established.
文章编号：201500040 中图分类号： 文献标志码：
基金项目:中国科学院重点部署项目资助(KZZD-EW-05-01)；国家自然科学基金资助项目（20141300833）
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引用文本：
吕立群,崔鹏,王兆印.两相泥石流的非恒定特性研究[J].工程科学与技术,2015,47(5):67-72.
LyuLiqun,CuiPeng,WangZhaoyin.Experimental StudyontheIntermittentSurgesofTwo-phaseDebrisFlow[J].Advanced Engineering Sciences,2015,47(5):67-72.
引用文本：
吕立群,崔鹏,王兆印.两相泥石流的非恒定特性研究[J].工程科学与技术,2015,47(5):67-72.
LyuLiqun,CuiPeng,WangZhaoyin.Experimental StudyontheIntermittentSurgesofTwo-phaseDebrisFlow[J].Advanced Engineering Sciences,2015,47(5):67-72.