Mechanism of the High-Speed and Long-Run-out Landslide Considering the Evolution of the Frictional Heat in the Sliding Zone

Abstract

Abstract A unified and systematic understanding of the dynamic mechanism of high-speed and long-run-out landslides has not been achieved due to the fast-movement speed and long sliding distance. It is difficult to explain the evolution process using conventional dynamic methods. In this study, the evolution of the frictional heat in the sliding zone and dynamic process of the Guang'an Village landslide were studied through field investigation and MatDEM numerical simulation software. A nucleated high-heat area was formed near the sliding zone, and it expanded in the forward motion direction during the sliding. The high-heat area corresponded to the trajectory projection of the thickest part of the sliding mass. It was difficult for the heat generated by the friction in the sliding zone to dissipate during the few seconds of the sliding process, and 80% of the heat was stored in the rock and soil near the sliding zone, causing the temperature of these materials to increase sharply. The connection state diagram and heat field diagram of the MatDEM unit intuitively showed the fracture development process in the sliding mass and sliding bed. The results of this study provide an important reference for the evolution mechanism of high-speed and long-run-out landslides.