Study On Seismic Stability Of High Rock Slope

Slopes are rock masses with a certain degree of slope and are widely found in mining engineering,construction engineering,and traffic engineering.The current method of slope stability under gravity is mature,but in earthquakes,due to the uncertainty of ground motion,the diversity of the physico-mechanical properties of the rock,the complexity of the structural plane location of the rock,the slope stability under the action of the earthquake have many shortcomings,and there is no uniform standard for stability analysis.This paper is based on the expansion project of Sanheming Mining Area(Central)in Inner Mongolia,using ABAQUS finite element analysis software to study the stability of high-steep rock joint slopes under earthquake.According to the combination of the geological structure of the slope and the potential damage of the slope,determine the failure mode of the slope,damage the boundary and the corresponding calculation method.Using numerical simulation method,considering the factors such as the structure surface and the shape of the slope,the dynamic response of the slope is quantitatively analyzed and the vibration law is obtained.Using the numerical simulation method,the slope size,geological interface and seismic effect for the slope stress field,deformation field and stability are analyzed according to the geometrical size of the slope after expansion and the latest geological data.In this paper,the ABAQUS is used to analyze the seismic effect.The results show that the rock section joint slope has effect on the amplification and vertical amplification of the input Hollister seismic wave,the amplification effect is lagging,and the lag time increases with the increase of the slope height.However,in the weak layer,the slope is not significantly enlarged,which is related to the structural surface.Based on the stability analysis of the slope model,under the influence of the fault structure,the slope destabilization is mainly due to the slip along the fault zone,and the plastic zone extends from the fault bottom fault zone to the empty face at the top of the slope,resulting in tension at the top of the slope until a penetrating area is formed.The safety factor under the action of earthquake is larger than that under the condition of self-weight,so it cannot be ignored.The total displacement is the largest at the top of the slope,and the horizontal displacement mainly occurs at the foot of the slope.The lateral stress is layered,and it appears the rhythm changes within the slope.Due to the shape of the slope differently,the stress concentration is formed at the sharp corners of the slope foot and the broken surface.The tension stress area at the upper free surface is along the weak interlayer,and the tensile cracks are generated at the surface rock layer,and the stress at the fault is abruptly larger,so that the regularity is interrupted,but the total is still regular.The vertical stress increases stepwise with the depth due to the different physical and mechanical properties of the rock,which is consistent with the law of stress.