Theoretical Solution Of Progressive Failure Analysis Of Slope

In recent years,with the rapid development of the construction of Subgrade Engineering in China,the stability of the slope not only relates to the steady progress of the construction of the project,but also to the sustainable development of the human environment.Therefore,the stability of the slope has been the most important issue in the research of the slope.However,the instability failure of slopes is not instantaneous,and its occurrence is the gradual destruction from local to the whole and the formation of slip surface.Therefore,it is necessary for us to study the progressive failure process of the slope.In view of the stress analysis of the slope along the sliding surface,the conclusion is drawn that the driving shear force in the failure area is greater than the friction force,pushing the landslide along the sliding surface,and the displacement(or shear strain)along the sliding surface(or shear strain)is discontinuous,and the current failure to solve both the shear stress and the shear strain are not continuous.The traditional numerical analysis is insufficient for simulating the failure process of slopes.To solve the above problems,the main research work is as follows:(1)The current development status of the current research on slope instability mechanism and stability at home and abroad is reviewed,and the shortcomings and development trends of the existing analytical methods are pointed out.(2)Put forward the basic idea of general continuous medium slope theoretical solution.Considering the slope under the conditions of engineering and natural action,the stress theory solution expression of the slope under different boundary conditions is obtained,so that the theoretical solution satisfies the equilibrium equation and boundary force boundary condition.(3)For the problem of discontinuity,that is,the stress and displacement of the failure area of the sliding surface,the balance condition and the displacement calculation method are put forward to obtain the theoretical solution of the stress and strain of the whole slope failure process,and establish the method of determining the critical state,and creatively solve the method of determining the potential sliding surface of the slope.(4)Introduce the new constitutive model proposed by Professor LU Yingfa,and introduce the basic equations,the determination of the parameters and the critical state analysis of the new constitutive model are introduced in detail.The stability evaluation criteria of geological material units based on stress and strain are established,and the overall stability evaluation method of slope based on stress and strain is created,and its results are compared with the traditional critical state method,and its profound physical significance is revealed.In addition,based on the existing calculation method of the stability coefficient of the landslide,a new definition method is proposed based on the constitutive model,and the comprehensive slide force-anti sliding force method(CSRM),the main thrust method(MPM),the integrated displacement method(CDM)and the surplus displacement method(RDM)are demonstrated.(5)Using the traditional stability calculation method and the stability analysis method based on the slope stress theory,combined with the new constitutive model,the landslide is calculated by the new constitutive model,and the mature finite element software MIDAS GeoX is used to simulate the deformation and stress of the landslide.The landslide calculation is close to the engineering practice.