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采用室内物理模型试验对滑坡碎屑流在运动过程的颗粒分离问题进行研究,主要考虑小颗粒含量、粒径差以及滑床糙率等因素的影响。试验结果表明:碎屑物质在运动中的分离程度受粒径差影响较大、受小颗粒含量的影响较小,增加滑床糙率可以使得颗粒分离现象更加明显。结合现场调研、物理模型试验及已有研究成果对高速滑坡–碎屑流运动过程中颗粒反序的成因机制进行探讨:碎屑物质在高速运动过程中,由于小颗粒等效摩擦系数较大,碎屑物质在运动方向上出现大颗粒在前小颗粒在后的分离现象;进入减速堆积阶段,小颗粒先停积,后续大颗粒可越过小颗粒堆积物继续向前运动,而小颗粒则多被阻挡在堆积物末端,最终堆积物形成前端以大颗粒为主、末端以小颗粒为主,中部大颗粒在上小颗粒在下的堆积物结构。
The indoor physical model test is used to study the particle separation problem of landslide debris flow in the process of movement, mainly considering the influence of the content of small particles, the difference of particle size and the roughness of the sliding bed. The experimental results show that the degree of separation of debris is greatly influenced by the particle size difference and is less affected by the content of small particles. Increasing the roughness of the slider can make particle separation more obvious. Based on field investigation, physical model test and existing research results, the mechanism of particle reverse sequence in high-speed landslide-debris flow movement is discussed. During the high-speed movement of debris, due to the large equivalent friction coefficient of small particles, In the direction of motion, the detritus material appears the separation phenomenon of the former small particles in the rear. In the decelerating accumulation stage, the small particles stop de-accumulating first, and the subsequent large particles can move forward more than the small particles, while the smaller ones Was blocked in the end of the deposit, the final accumulation of the formation of large particles to the front-end, mainly small particles at the end, the middle of large particles in the accumulation of small particles in the next structure.