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工程科学与技术:2016,48(3):1-11
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泥石流运动阻力特性及其研究进展
(中科院山地所)
Study and Research Progress of Resistance Character of Debris-flow
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投稿时间:2015-12-15    修订日期:2015-12-15
中文摘要: 泥石流是一种由液相浆体和固相粗颗粒构成的特殊两相流体,其运动和动力性质研究的关键在于科学认识和描述其阻力特性。泥石流的阻力可以分为内部阻力和外部阻力。外部阻力是沟道底床和侧壁与泥石流体相互作用的结果,与沟床的粗糙度、几何形态以及泥石流体的性质相关。内部阻力与泥石流体的物质构成有关,粘性细颗粒含量较多的粘性泥石流在运动过程中固、液两相的相对速度不明显,可以将粘性泥石流看成是一种均匀的混合流体,用伪一相流进行模拟,但其内部阻力仍应分为液相浆体阻力和固相颗粒间的阻力;粘性细颗粒含量较少的泥石流,液相浆体对粗颗粒的约束作用较小,存在明显的相间速度,诸如粘性拖曳力、附加质量力等相间作用力的影响非常重要。浆体中的细颗粒物质对泥石流运动阻力具有非常重要的影响,细颗粒物质的含量改变了液相浆体的阻力特性,包括屈服应力和粘性系数,而浆体的粘性将进一步改变固相颗粒间的相互作用。通过分析粘性泥石流的阻力特性,我们初步提出了泥石流的综合阻力模型。
Abstract:Debris-flow is a kind of two-phase fluid, which contains liquid-phase with slurry and solid-phase with coarse grains. The resistance characteristics, which can be divided into internal resistance and external resistance, is a critical factor for the study of kinematic and dynamic of debris-flow.The external resistance caused by interaction between debris-flow and gully-bed and gully-wall depends on the roughness and geometric shape of gully and properties of debris-flow.The debris-flow can be classified into viscosity debris-flow and two-phase debris-flow for understanding their internal resistance characteristics. For the former, the solid-phase and liquid-phase during the motion have no obvious slip velocity, therefore viscosity debris-flow could be identified as a kind of homogeneous mixing fluid and modeled by pseudo-homogenous fluid. However, for the two-phases debris-flow, the solid-phase and liquid-phase have obvious slipvelocity;the stress forces due to solid-liquid interaction, such as viscosity drag force and virtual mass force etc., plays critical role, and thus the stress due to interactions of solid grains, which comes from granular flow, is a key factor. The Fine contents in liquid-phase slurry has a huge effect on the resistance character of a debris flow and can change the resistance character of liquid-phase slurry, including yield stress and viscosity coefficient. Furthermore, the viscosity coefficient of slurry can have effects on stress due to interaction of solid grains. In this study, a comprehensive resistance model of debris-flow, including internal resistance and external resistance, has been proposed.
文章编号:201501349     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(KZZD-EW-05-01),中国科学院科技服务网络计划(STS计划)项目(KFJ-EW-STS-094),国家自然科学基金国际合作重点项目(41520104002)
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cuipeng  pengcui@imde.ac.cn 
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引用文本:
崔鹏.泥石流运动阻力特性及其研究进展[J].工程科学与技术,2016,48(3):1-11.
cuipeng.Study and Research Progress of Resistance Character of Debris-flow[J].Advanced Engineering Sciences,2016,48(3):1-11.