Analysis Of Slope Stability Under The Coupling Action Of Seepage And Earthquake

The stability study of the slope is an important subject in the geotechnical engineering field.Many factors such as the earth environment,the geological structure,the nature of the rock and soil,the seismic force and the groundwater,etc.,are all related to the stability of the slope.related.Most areas in western my country are in strong earthquake areas,with high seismic activity intensity and frequency.In some mountainous areas,there is still a lot of rainfall or groundwater.Such environmental conditions inevitably exist a large number of slope projects related to seismic forces and groundwater.problem.Therefore,studying the slope stability under groundwater seepage and earthquake is of great significance.This article first briefly introduces the slope stability influencing factors,slope stability calculation methods,etc.Then,on the basis of the existing theory,the analytical calculation of the slope safety factor under the coupling effect of seepage and earthquake is proposed.On this basis,the pseudo-static The force method has been improved to calculate the slope safety factor under the coupling action of seepage and earthquake.Finally,the rationality of these two algorithms is verified by numerical simulation.The main research contents and results are as follows:(1)Assuming that the infiltration line produced by groundwater is in the form of a parabola,an analytical formula for the seepage pore water pressure on the sliding surface is obtained.On this basis,based on the limit equilibrium theory,the analytical formula of the pseudo-static method for calculating the safety factor of the clay slope under the coupling action of seepage and earthquake is deduced according to the position of the infiltration line.The calculation results are basically consistent with the results of the calculation examples.The feasibility of this method.(2)When calculating the anti-sliding moment of the horizontal seismic inertial force by the vertical strip method,there are some unreasonable places.In order to improve the calculation,this paper uses a mathematical method from the perspective of the integral model to select a miniature calculation unit,and first calculate the horizontal force pair The anti-sliding moment and sliding moment of the center of the arc surface of the slope failure,and then calculate the anti-sliding moment and the sliding moment of the vertical force on the center of the arc surface of the slope failure.Finally,the stability coefficient is equal to the total anti-sliding torque according to the formula The ratio to the total sliding moment.At this time,when calculating the moment of the horizontal force on the center of the arc surface of the slope,the soil of the slope sliding is calculated according to the horizontal direction.When calculating the moment of the vertical force on the center of the slope of the arc surface,Calculate the sliding soil mass according to the vertical direction.The analytical formula of the improved pseudo-static method for slope stability coefficient under the coupling of seepage and earthquake is obtained,and the calculated results are compared with the results of existing calculation examples.The results of the two are similar,which verifies the feasibility of this method.(3)The geotechnical analysis software Geo-Studio simulates and analyzes the slope stability under the coupling effect of seepage and earthquake,obtains the pore water pressure change of the slope and the seismic dynamic response;calculates the seepage and dynamic response of the slope under different soil parameters.The safety factor under seismic coupling is compared with the calculation results of the two improved algorithms in this paper under the same working conditions,which verifies the rationality of the two improved algorithms in this paper.