Slope Stability Analysis And Reinforcement Measures Under Seepage-Stress Coupling And Rainfall Infiltration

Slope stability analysis is an important subject in infrastructure construction.Among the factors affecting slope stability,groundwater and rainfall infiltration couldn't be ignored.When groundwater and rainwater flow in the slope,their seepage field and stress field interact with each other,presenting a complex state of seepage-stress coupling.Based on the strength reduction method and the seepage-stress coupling theory,the paper uses the finite element analysis software ABAQUS to analyze the seepage field,stress field,displacement field and safety coefficient of different slope models to explore the slope stability under three conditions(without groundwater,seepage-stress coupling,seepage-stress coupling and rainfall infiltration).On this basis,the influence rules of different material parameters,seepage conditions and rainfall conditions on slope stability are obtained.Finally,the reinforcement effect of anti-slide pile on three-dimensional slope is analyzed.The main research contents and results of this paper are as follows:(1)The slope stability analysis method,strength reduction method and seepage-stress coupling theory are introduced.The mathematical model of seepage-stress coupling is established.The realization process of strength reduction method and seepage-stress coupling in ABAQUS is described.(2)Based on the seepage-stress coupling theory and the strength reduction method,it is analyzed that the slope stability under three workingV conditions of without groundwater,seepage-stress coupling,seepage-stress coupling and rainfall infiltration.The safety coefficients of the slope under three working conditions are 1.908,1.755 and 1.641,respectively.By comparing the safety coefficients of the three working conditions,it can be seen that groundwater will significantly reduce the safety coefficient of the slope and rainfall infiltration will increase the saturation of the slope,increase the velocity and displacement of the slope,significantly elevate the position of the infiltration surface.It can be seen that groundwater and rainfall infiltration have a great negative impact on slope stability.(3)Based on the slope model under the seepage-stress coupling condition,the influence rules of material parameters and seepage conditions on the slope stability are analyzed.The results show that with the increase of cohesive force and angle of internal friction,the safety coefficient of slope increases linearly.Elastic modulus and Poisson ratio have little influence on the slope safety coefficient,but will significantly affect the deformation characteristics of the slope.With the increase of water head height,the position of infiltration surface in the slope elevates,the seepage velocity increases,and the slope safety coefficient decreases.The height of infiltration surface corresponding to different isotropy of permeability coefficients is basically the same,and the slope safety coefficient is around 1.755.(4)Based on the slope model under the combined action of seepage-stress coupling and rainfall infiltration,the influence rules of different rainfall conditions on the slope stability are analyzed.The results show that with the increase of rainfall time,the position of the infiltration surface will elevate,the seepage velocity will gradually rise,and the safety coefficient will decrease,especially at the beginning of rainfall.With the increase of rainfall intensity,the seepage velocity and displacement in the slope will gradually increase,and the safety coefficient will decrease.It can be seen that theincrease of rainfall time and intensity will adversely affect the slope stability.(5)Based on the slope model of without groundwater conditions,reinforcement effect of anti-slide pile on three-dimensional slope is analyzed.After the reinforcement of anti-slide pile,the slope has not formed the whole sliding surface,displacement and plastic zone of the pile soil significantly decreases,and the safety factor of slope increases significantly.The effect of anti-slide pile to reinforce the slope is very obvious,so anti-slide pile can be applied to engineering practice.By considering the coupling effect of seepage field and stress field,this paper studies slope stability under different conditions.The influence of different factors on slope stability is obtained.And the reinforcement effect of anti-slide pile on three-dimensional slope is analyzed.The conclusions obtained have certain reference significance and application value for engineering practice activities such as slope instability prevention and reinforcement in areas with high groundwater level and abundant rainfall.