Seismic dynamic stability analysis of landslide based on unbalanced thrust method

The unbalanced thrust method is one of the main research methods for the stability evaluation of the geological hazard of the landslide caused by the earthquake. When the traditional unbalanced thrust method is used to calculate the safety factor of the seismic downhill slope, all the soil strips use the same seismic acceleration. This treatment does not consider the propagation process of seismic waves in the landslide body. In this paper, the peak acceleration of the seismic center of each soil strip is obtained by numerical simulation, considering the temporal and spatial variation of seismic waves in soil strip, forming an imbalance considering multi-point seismic action thrust method. Based on this, taking the landslide formed by the K92 roadbed excavation of a highway in Yunnan as an example, the unbalanced thrust and safety factor under different seismic intensities are analyzed, and the engineering reinforcement effect is studied. Analysis shows that: sliding surface has obvious sliding section and anti-slip section, and the sliding section is distributed in the soil block with large inclination angle at the trailing edge of the landslide,and the anti-slip section is distributed in the lower part of the landslide; the landslide is in an unstable state after excavation, which is consistent with the scene.After comprehensive measures such as slope reduction, anti-slide pile reinforcement and prestressed anchor cable reinforcement, the landslide meets the requirements of earthquake resistance against IX. The research results provide an effective method for the evaluation of dynamic stability of landslides caused by earthquakes.