A Numerical Simulation and Analysis of Stability of Rock Slope under Rainfall Condition

According to the actual engineering conditions of an expressway's slope,the finite element model of the rock slope is set up under the rainfall conditions by unstable saturated-unsaturated seepage flow with rainfall infiltration.The law of the groundwater seepage field of the slope under two conditions of heavy rain in the flood seasons and continuous rainfall conditions are calculated and analyzed,and the underground water load is determined.The process of stage excavation and reinforcement of the slope are further simulated,and the stress and deformation law and displacement change of the slope during each stage are analyzed,and the stability of slope is evaluated under two conditions.The results that the minimum safety factor after rainfall is smaller than before rainfall,and the local safety factor is less than 1.0,so there is a risk of landslide.The minimum safety factor after rainfall with support of mooring wire rope is bigger than without support,and the distribution of smaller safety factors certainly decreases,so the safety factor is raised greatly,which can meet the stability demands.The results not only provide a scientific basis for the project construction,but also play an important guiding role in the slope reinforcement measures and landslide forecast.