Study On The Stability Of Slope Under Different Rainfall And Seismic Conditions

The stability of the slope is still a very hot topic due to the inability of external factors to accurately predict and the detrimental effects on people’s property and life after the instability.Among the many external factors,rainfall and earthquake are the main factors,so studying the stability of the slope under earthquake and rainfall conditions has great practical significance for academic and engineering practice.The southwestern region of China is located on a seismic belt and has a high frequency of earthquakes.In addition,the region has a relatively large amount of rainfall and a long duration,and there are many high-grade rock slopes with mudstone and sandstone sandwich structure in eastern Sichuan.The high rock slope of the road in the extension of Hengyi Road,Fuxing Town,Beibei District,Chongqing City is an engineering background.The finite element ABAQUS software was used to establish a three-dimensional model to explore the stability and deformation of the slope under different rainfall types and earthquake conditions.Under the influence of the most unfavorable rainfall and earthquake coupling,the stability changes and corresponding deformation characteristics of the slope after the anchor bolts are arranged at different positions.The research content of this article mainly has the following aspects:(1)Using ABAQUS software to establish a three-dimensional model,the stress field,displacement field and safety factor of the slope under earthquake are analyzed.The deformation characteristics and stability of the slope under the action of seismic load are studied.The results show that with the increase of the horizontal acceleration of the earthquake,the stress on the slope gradually increases from shallow to deep,and the stress reaches the maximum at the bottom of the slope.The rock and soil slope is mainly subjected to tensile damage and the failure occurs on the top of the slope under the action of seismic load.The permanent displacement of the slope increases with the acceleration of the horizontal acceleration;the safety factor of the slope decreases as the horizontal acceleration of the earthquake increases.(2)Using ABAQUS software to build a three-dimensional model,the pore water pressure field,displacement field and safety factor of the slope under short-time heavy rain,long-term heavy rain and days of heavy rain were analyzed.The stability and deformation law of the slope were studied.The results show that the pore water pressure and displacement are the largest under short-term heavy rainstorm conditions,and thepore water pressure and displacement under the long-term rainstorm conditions are the next,and the pore water pressure and displacement under the conditions of heavy rainfall over several days.The minimum and maximum displacements are found on the surface and top of the prime fill.Compared with different rainfall types,the greater the rainfall intensity,the lower the stability of the slope.(3)The ABAQUS numerical model was used to analyze the stress field,displacement field and safety factor of the slope after arranging the anchors at the top of the slope,in the slope and at the foot of the slope under the influence of the most unfavorable rainfall and earthquake coupling,and the stability and change of the slope were studied.law.The results show that the overall stability of the slope after applying rock bolts under the coupling of rainfall and earthquake loads has been significantly improved,and it has been found that it is better to arrange anchor rods in the slope than to apply anti-sliding effect at the top of the slope and the foot of the slope.