汤碧辉, 孙红月, 胡杭辉, 吴纲, 翁杨. 2018: 黏性泥石流对球型大颗粒启动的临界条件分析. 工程地质学报, 26(6): 1631-1637. DOI: 10.13544/j.cnki.jeg.2017-507
    引用本文: 汤碧辉, 孙红月, 胡杭辉, 吴纲, 翁杨. 2018: 黏性泥石流对球型大颗粒启动的临界条件分析. 工程地质学报, 26(6): 1631-1637. DOI: 10.13544/j.cnki.jeg.2017-507
    TANG Bihui, SUN Hongyue, HU Hanghui, WU Gang, WENG Yang. 2018: ANALYSIS ON CRITICAL HYDRAULIC CONDITION FOR STARTING MOTION OF LARGE-SIZED PARTICLES IN VISCOUS DEBRIS FLOW. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1631-1637. DOI: 10.13544/j.cnki.jeg.2017-507
    Citation: TANG Bihui, SUN Hongyue, HU Hanghui, WU Gang, WENG Yang. 2018: ANALYSIS ON CRITICAL HYDRAULIC CONDITION FOR STARTING MOTION OF LARGE-SIZED PARTICLES IN VISCOUS DEBRIS FLOW. JOURNAL OF ENGINEERING GEOLOGY, 26(6): 1631-1637. DOI: 10.13544/j.cnki.jeg.2017-507

    黏性泥石流对球型大颗粒启动的临界条件分析

    ANALYSIS ON CRITICAL HYDRAULIC CONDITION FOR STARTING MOTION OF LARGE-SIZED PARTICLES IN VISCOUS DEBRIS FLOW

    • 摘要: 泥石流是一种破坏力巨大的地质灾害,其破坏力主要来源于浆体中裹挟的大颗粒。相近速度情况下,相同体积的大颗粒比液相浆体拥有更大的冲击力。本文针对黏性泥石流沟内大颗粒的滚动启动,建立了合理并且较为简洁的计算模型。水流条件是泥石流爆发的关键因素,通过分析计算球型大颗粒在浆体冲击下受到的上举力、推移力、有效重力等,考虑支承颗粒和启动颗粒相对位置的随机分布问题,求解大颗粒临界启动时的力矩平衡方程,得到对应的上游来流临界条件。临界启动流速公式符合普适性规律,并且通过计算流体软件FLUENT对3个典型算例的数值模拟,得到的数值解与理论解吻合得较好。本文结论对黏性泥石流沟的防治工程设计,特别是水石分流中排水流量的计算具有一定借鉴意义。

       

      Abstract: Debris flow is a devastating geological disaster due to the destructive power of large-sized particles. The large-sized particles have greater power than the liquid at the same volume and velocity. In order to investigate the starting mechanism of large-sized particles in viscous debris flow, a reasonable and simple calculation model is developed. The flow condition is the key factor of the debris flow outburst. Considering the random distribution of relative position between supporting and starting particles, the critical hydraulic condition of upstream is achieved by analyzing the particle forces under the impact of slurry. The forces include the lift force, drag force, effective gravity. The particles' moment equilibrium equation of staring condition is solved. The proposed formula of critical starting velocity is consistent with universal laws. The theoretical results by proposed formula are in good agreement with numerical simulation results of three typical cases made by CFD software FLUENT. The proposed formula has significance for preventing and controlling debris flow, especially in the calculation of the discharge in separation of water and solid.

       

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