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滑坡–碎屑流在高速运动过程中对基底物质存在明显的冲击铲刮作用,从而造成滑坡体积不断增大,扩大其致灾影响范围。通过开展物理模型试验研究滑坡物质的颗粒粒径和体积以及基底物质的粒径和堆积厚度对铲刮效应的影响,同时采用Motion Pro-Y3–S1高速摄像机观察冲击铲刮过程。试验结果表明:滑坡物质在运动过程中强烈地冲击铲刮基底物质,使其高速飞溅及剪切运动;铲刮距离随滑坡物质体积、粒径以及基底物质颗粒粒径的增大和可侵蚀基底厚度的减小而增大。结合试验现象以及前人的研究成果对滑坡冲击铲刮机制进行探讨:滑坡–碎屑流的冲击铲刮作用在前缘主要表现为冲切破坏,它以撞击力的形式使基底物质发生破坏而铲刮,而在中后部主要表现为运动剪切作用,以剪切力的形式使基底物质发生剪切破坏而被铲刮。
Landslide - debris flow in the high-speed movement of the substrate material there is a significant impact scraping scraping, resulting in increasing landslide volume, expanding its disaster-affected areas. Through the physical model test, the effects of the particle size and volume of the landslide material and the particle size and thickness of the substrate material on the scraping effect are studied, and the impact scraping process is observed by using a Motion Pro-Y3-S1 high-speed camera. The test results show that the landslide material strongly impacts the substrate scraping and scraping the base material during the course of the movement so as to cause high-speed splashing and shearing movements. The scraping distance varies with the volume and particle size of the landslide material and the particle size of the base material, Increase and decrease. Combining with the phenomenon of the experiment and the previous research results, the mechanism of landslide impact scraping is discussed. The impact of landslide-debris flow scraping is mainly caused by punching failure at the leading edge, which destroys the substrate material in the form of impact force Scraping, and in the latter part of the main performance of the role of shear movement, the shear force in the form of shear damage to the substrate material was scraped.