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首页> 外文期刊>Proceedings of the Institution of Civil Engineers. Water Management >Study on two-phase dynamic behaviours within non-homogeneous debris flow
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Study on two-phase dynamic behaviours within non-homogeneous debris flow

机译：非均质泥石流中的两相动力学行为研究

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摘要

Non-homogeneous debris flows consisting of a wide range of grain size are commonly modelled as two-phase flows. In adopting such an approach, a critical grain diameter to separate the solid and liquid phases within such debris flows can be determined through the principles of minimum energy dissipation. In this paper, an improved analytical approach using the resistance formula of water flow and the mass conservation law is presented to determine the velocity of solid and liquid phases within a non-homogeneous debris flow. Some of the dynamic parameters are validated against experimental data measured from the Jiangjia gully. The results show that, for the majority of non-homogeneous debris flows tested, the liquid phase exhibits higher velocity than the solid phase. However, as the bulk density of the debris flow increases, the solid phase tends to have higher velocity than the liquid phase. These findings are shown to have important implications on the vertical grading patterns of bed deposits. The field observations indicate that non-homogeneous debris flows with bulk density being significantly lower, close to and significantly higher than the critical value seem to exhibit, respectively, normal, mixed and inverse grading patterns in the alluvial fan deposits.
机译：通常将由大范围晶粒尺寸组成的非均质碎屑流建模为两相流。在采用这种方法时，可以通过最小能量耗散的原则来确定将这些碎屑流中的固相和液相分开的临界粒径。本文提出了一种改进的分析方法，该方法利用水流的阻力公式和质量守恒定律来确定非均匀泥石流中固相和液相的速度。相对于从江家沟测量的实验数据验证了一些动态参数。结果表明，对于测试的大多数非均质碎屑流，液相显示出比固相更高的速度。然而，随着泥石流的堆积密度增加，固相倾向于具有比液相更高的速度。这些发现表明对床沉积物的垂直分级模式具有重要意义。现场观察表明，堆积密度显着降低，接近和显着高于临界值的非均质碎屑流似乎分别显示出冲积扇沉积物中的正常，混合和反向分级模式。

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  • 作者

    Anping Shu; Le Wang; Songdong Shao; Guoqiang Ou;

  • 作者单位

    School of Environment, Key Laboratory of Water and Sediment Sciences of MOE, Beijing Normal University, Beijing, China;

    Postdoctoral Researcher, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China|Senior Lecturer, Department of Civil and Structural Engineering, University of Sheffield, Sheffield, UK;

    State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China;

    Institute of Chengdu Mountain Hazard and Environment, Chinese Academy of Sciences, Chengdu, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    geology; granular materials; hydraulics hydrodynamics;

    机译：地质;颗粒材料;液压与流体力学;

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