Slope Stability Analysis Based On Fluid-solid Coupling

With the growing number of population in cities,more and more constructions have been built.The slope stability of foundation pit is getting more and more attention.However,it affected by many factors such as the number of slopes,soil layer structure,unscientific design,ground water and rainfall infiltration.In result of accidents occur from time to time,which cause not only great economic losses,but also casualties.Therefore,it is of great significance to study the slope stability of foundation pit.The paper is based on an engineering program in Wuxi city.Through a geological survey on the spot,the selection of the construction methods and reinforcement of specific conditions,the survey has been carried out on theoretical analysis and finite element simulation.And it also analyzes four kinds of working conditions about the stability of the slope and puts forward optimization method.Main conclusions are as follows:(1)Several common methods for analyzing the slope stability are introduced,which explained the advantages and applicability of finite element strength reduction method.(2)The basic differential equation of seepage flow is inferred from the continuity equation of fluid through the theory of Darcy law and other related seepage theory.Several effects of rainwater infiltration are analyzed and the interaction mechanism of stress field and seepage field in fluid-structure coupling is described in detail.In the case of fluid-structure interaction coupling,mathematical model of the foundation pit slope is obtained and the strength reduction method is combined.(3)In this paper,there working conditions were simulated,water-free,groundwater,under different rainfall intensity,groundwater and rainfall combined.The safety coefficients obtained were 3.4,2.9,2.15(mean rainfall intensity),1.5(maximum rainfall intensity),and 1.44.The effects of groundwater and rainwater on slope stability of foundation pit are explained and tested.Get graphs of different rainfall intensity and slope stability safety coefficients.Put forward and Prove longer bar length can increase the safety coefficients.(4)The change of cohesion and internal friction Angle of the material has the greatest influence on the safety coefficients and is approximately linear.The elastic modulus and poisson ratio of the material have no effect on the calculation of safety coefficients.The safety coefficients of the material is evaluated according to material severity of the actual situation.The effect of the dilatation Angle on the safety coefficient of the slope is very small.