Numerical Analysis of Instability Mechanism of a High Slope under Excavation Unloading and Rainfall

High slope simulation analysis is an essential means of engineering design, construction, and operation management. It necessary to master dynamics, ensure safety, analyze instability mechanisms, carry out stability early warning prediction. This paper, aiming at the landslide phenomenon high on left bank a reservoir project, considering influence stratum lithology, fault, excavation unloading, rainfall, water storage, establishes refined finite element model that reflects internal structure slope. The fluid-solid coupling numerical carried out. Based this, failure mechanism under unloading heavy rainfall explained. application example shows combined action infiltration, in-plane saturation formed fault trailing edge surface increases, pore pressure shear strain concentration area appears structural extends along front rear edges slope, resulting in damage.