中文摘要：

非均质泥石流是一种固体颗粒级配宽、容重变化大、流速分布不均匀的典型的固液两相流,广泛分布于我国的西部山区,表现出独特的固液两相运动特征.基于非均质泥石流固液两相分界粒径的概念,以Darcy公式和质量守恒定律为理论基础,分别推求非均质泥石流固液两相平均流速表达式.在此基础上,根据云南省小江流域蒋家沟泥石流模拟实验数据及实测资料,揭示了非均质泥石流固液两相运动特征.蒋家沟泥石流实验与实测资料计算分析结果表明,蒋家沟泥石流以临界容重2.234t/m^3为界限,当泥石流容重低于、等于和高于该临界值时,分别出现液相流速大于、等于和小于固相流速的3种情况,由此可以分别揭示稀性泥石流、均质泥石流和稠性泥石流3种不同类型泥石流的运动特征.研究结果为构建非均质泥石流动力学奠定了基础,并对泥石流防治工程规划设计和预测预报泥石流灾害具有重要的现实意义.

英文摘要：

Non-homogeneous debris flow is a typical two-phase flow with a large range of solid grain size and specific gravity and no-uniform velocity distribution.Based on the principle of the minimum energy dissipation,the critical diameter between solid phase of the coarse particles and liquid phase composed by both the fine particles and water in non-homogeneous debris flow was established.Furthermore,based on the modified Darcy＇s formula and mass conservation law,two-phase flowing velocities for non-homogeneous debris flow were developed preliminarily.Correspondingly,it has been verified that calculating value using the velocity formulas of solid and liquid two-phase flow is corresponding to the measured data from Jiangjia gully,Yunnan Province,China.There comes to some meaningful conclusions,such as the velocity of solid phase is more than one of liquid phase due to the specific gravity higher than 2.234 of debris flow,the corresponding deposition shows the inverse property;whereas velocity of solid phase is usually less than one of liquid phase in the general situations,the corresponding deposition behaves the straight property.If the velocity of two phases become much closer,the corresponding deposition possesses intermix property.These results are very significant for both developing dynamical model for non-homogeneous debris flow and designing of control engineering for debris flow disasters.