高速远程滑坡启动机制及基底铲刮试验研究

Experimental Study on Start-up Mechanism and Basement Scraping of High-speed and Long-distance Landslide

为探究高速远程滑坡碎屑流运动特征及机理,以丹扎木村试验田滑坡为工程依托,采用物理模型试验,通过滑坡碎屑流在运动过程中铲刮基底松散堆积物的过程来研究滑坡动力铲刮行为,并基于摩擦学基本理论对模型试验观测结果进行讨论。结果表明:滑坡碎屑流对基底物质存在“高速冲击剪切侵蚀行为”和“运动基底剪切行为”两种铲刮侵蚀模式;当坡度较陡时,碎屑流的运动距离更远;当铲刮量更大时,碎屑流的能量随着铲刮体积的增大而增加。所得结论为西南山区高位滑坡碎屑流的动力侵蚀模式提供了研究支撑。

In order to explore the movement characteristics and mechanism of debris flow in high-speed and long-distance landslide,the physical model test was used to study the dynamic shoveling behavior of landslide through the process of scraping the loose accumulation of base during the movement of landslide debris flow.the observation results of model test are discussed based on the basic theory of tribology.The results show that there are two scraping erosion modes of landslide debris flow,“high speed impact shear erosion behavior”and“moving basement shear behavior”;when the slope is steeper,the movement distance of debris flow is longer;when the amount of scraping is larger,the energy of debris flow increases with the increase of scraping volume.The conclusions provide support for the research on the dynamic erosion model of high landslide debris flow in southwestern mountainous area.