Effect of debris flow converging into river on the basis of physical simulation experiments
ZHU Dapeng1，2，QIN Liangkai3，HE Qiduo3
(1. School of Geoscience and Technology，Southwest Petroleum University，Chengdu，Sichuan 610500，China； 2. Key Laboratory of Disaster Prevention and Mitigation，Hubei Province China Three Gorges University，Yichang，Hubei 443002，China；3. School of Civil Engineering and Architecture，Southwest Petroleum University，Chengdu，Sichuan 610500，China)
Abstract：As for prevention and cutting off the disaster chain induced by debris flow converging into river，taking the debris flow happened on August，14th at Hongchun Ditch，Wencuan County as the prototype，the physical simulation model is established，and 5 groups of 17 physical simulation tests are used to study the main factors that influence the debris flow flowing into river. The results are that，the intersection angle of 90°is the easiest condition to block the river. The more rapid the flow speed of the main river is，the stronger the ability of its scouring and carrying particles is and the smaller the volume of accumulation at intersection zone is. When the moisture content is close to 0.85，the accumulation volume reaches the maximum. Accumulation volume has a linear relationship with the total amount of disposable solid source，and the total amount contributes to a bigger growth rate on accumulation volume than other factors，such as intersection angle and flow velocity. Its easy to form the submerged dam below water if the source volume of debris flow is small. When the source volume of debris flow increases gradually，one part of debris flow forms into submerged dam，the other part remains its movement above water，and then the fine particles is taken away by the river while the coarse one remains at the intersection zone which leads to blocking the river partially or totally. Gravity of mixture in test and flow velocity by back calculation is in accord with the Hongchun Ditch debris flow basically，and it verifies the accuracy of the physical simulation experiment.
朱大鹏1，2，秦粮凯3，何其多3. 基于物理模拟试验的泥石流汇江效应初步研究[J]. 岩石力学与工程学报, 2016, 35(S2): 3680-3688.
ZHU Dapeng1，2，QIN Liangkai3，HE Qiduo3. Effect of debris flow converging into river on the basis of physical simulation experiments. , 2016, 35(S2): 3680-3688.
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2016, Vol. 35 
