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我国常年遭到泥石流灾害的侵袭,由此造成的损失不计其数。泥石流拥有巨大冲击力,其中大部分来自其中裹挟的大颗粒。文中对稀性泥石流中大颗粒的起动与水流条件的关系进行了研究。以斜坡上的球形颗粒为研究对象,分析了球体受到的上举力、推移力、有效重力;使用概率论的理念解决了颗粒在斜坡上的随机分布问题,得到了各个外力的力臂期望,并求解了颗粒临界起动时的力矩平衡方程,获得了颗粒起动的作用流速,进而将之转化为断面平均流速,由此得到了稀性泥石流中大颗粒的起动与水流条件的关系。这对泥石流防治工程,特别是排水设施的设计具有一定参考意义。
Perennial mudslides hit our country, resulting in the loss of countless. Debris flow has a huge impact, most of which come from the host of large particles. In this paper, the relationship between the start-up of large particles and the flow conditions in dilute debris flow was studied. Taking the spherical particles on the slope as the research object, the uplift force, pushing force and effective gravity of the sphere are analyzed. The concept of probability theory is used to solve the problem of random distribution of particles on the slope, The equation of moment equilibrium at the critical start of the particle was solved, and the effect of particle start flow velocity was obtained, which was then converted to the average velocity of the cross section. The relationship between the start of large particles and the flow condition was obtained. This is of certain reference significance to debris flow prevention and control engineering, especially the design of drainage facilities.