Numerical evaluation of the deformation and failure mechanisms and movement processes of the Guanling landslide in Guizhou, China

This study explores the whole process of deformation-failure-movement of fault-type slopes under rainfall conditions. Taking the Guanling landslide as an example, this paper simulates the whole process of the Guanling landslide based on FLAC/PFC coupling. The research results show that the simulated Guanling landslide accelerates deformation and failure due to the influence of reverse faults and rainfall. In general, the simulated Guanling landslide first fails in the form of sliding on the left side and then collapsing on the right side. The bottom unit mainly consists of tensile-shear composite failure that is supplemented by shear failure. After the simulated Guanling landslide failure, the average peak velocities basically show a trend of first increasing and then decreasing from top to bottom and from left to right. Overall, the landslide bed is basically in a state of compression, and the impact stress is constantly attenuated with the movement process. The sigma(1) trace of the landslide bed is basically consistent with the movement direction of the landslide body. As burial depth increases, the trace is obviously deflected downwards. According to the law of conservation of energy, the hydrodynamic work and gravitational potential energy are 2.96 x 10(12) J and 4.43 x 10(12) J, respectively, and the energy consumption of the peak bonding energy, peak kinetic energy, sliding energy and damping energy are 7.77 x 10(11) J, 1.41 x 10(12) J, 5.55 x 10(12) J and 1.66 x 10(12) J, respectively. Finally, the accumulation forms of the landslide bodies in each section after the termination of the simulated Guanling landslide are compared, and the simulation results are consistent with the actual situation, which confirms the reliability of the simulation results. These research results provide a reference for studying the failure mechanisms and movement characteristics of similar geological landslide disasters.