Simulation Of Slope Progressive Failure Process Based On Extended Finite Element Method

In recent years,with the rapid development of China's economy,the development of a large number of civil engineering and the frequent occurrence of natural disasters such as debris flow and earthquakes,the problem of landslides has attracted widespread attention.As one of the main factors inducing landslide,cracks have also been extensively studied by scholars at home and abroad.With the emergence of extended finite element method,a new way has been opened up for the study of cracked slopes.Compared with other research methods,extended finite element method is more suitable for simulating discontinuous problems such as cracks,and it does not need to re-mesh in calculation,so it is more suitable for simulating crack propagation of slopes.This paper summarizes the research status of cracked slopes at home and abroad and the basic theory of extended finite element method.On the basis of the above,the extended finite element method of ABAQUS is used to analyze the stability of cracked slopes at the top of slopes and slopes under the condition of rainfall infiltration,which provides reference suggestions for future practical projects.Its main research contents are as follows:(1)Through collecting and sorting out the literature at home and abroad,this paper systematically summarizes the research status of slope stability,analyses the research status of cracked slope at home and abroad,and compares the limitations,advantages and disadvantages of finite element method,meshless method,discrete element method and extended finite element method in the study of cracked slope.(2)The basic theory of extended finite element method and rock fracture criterion are summarized.The application of extended finite element method in ABAQUS and the two criteria of crack propagation-maximum principal stress and maximum principal strain criterion are introduced in detail.Based on the basic theory of fracture mechanics,the most easily cracked position and critical crack length of slope are judged.The slope with tension crack at the top of slope is simulated by ABAQUS numerical analysis software.The change of slope safety factor with the depth of crack and the distance from the top angle of slope is analyzed.By changing the height of slope,the slope safety factor is summarized.The relationship between the most susceptible cracking location and the critical crack length and the change of slope height.The influence of different soil shear strength parameters C and_on the stability of tensioned cracked slope is simulated.The variation of the safety factor of slope under different crack depths and the variation of critical joint length with the shear strength parameters of soil are analyzed.(3)The basic theory of slope rainfall infiltration is summarized.Based on the model of Chapter 3,ABAQUS is used to simulate the slope with cracks on the top of the slope,and the stability of the slope is systematically analyzed.The effects of rainfall intensity,crack inclination,crack depth and permeability coefficient ratio on pore water pressure and safety factor of slope are studied.The variation law of safety factor between cracked slope and non-cracked slope is compared and analyzed.(4)Based on practical engineering data,the influence of rainfall infiltration on the stability of fractured slope is studied.The variation of pore water pressure and the variation of slope safety factor with rainfall time are mainly studied under different number and spacing of cracks,which provides a basis for the failure of fractured slope caused by rainfall infiltration in the future.Reference resources...