Analysis Of Progressive Failure Stability Of Thrust-type Landslide

Landslide disaster causes great loss to people's life and property safety,and also causes great damage to the environment.It is of theoretical significance to strengthen the research of landslide disaster.The destruction of landslide is not instantaneous,but a gradual destruction process from local to whole.The distribution characteristics of the force along the sliding surface are analyzed,and the driving force at the back edge of the landslide is greater than the friction force,which pushes the landslide to the front edge,and there is stress discontinuity in the post-failure zone,and the failure of the landslide occurs continuously from point to surface to body.In this paper,the thrust-type landslide as an example analysis of the specific research work as follows:(1)Various methods of landslide stability analysis and the research status of deformation mechanism and behavior characteristics of landslide at home and abroad are reviewed,and their advantages and disadvantages are analyzed to provide a basis for the work of this paper.(2)This paper introduces a kind of stress theory solution based on force boundary and balance condition,obtains the stress theory solution on the basis of satisfying the stress boundary condition and balance equation,and gives the solution process analysis of the specific landslide theory solution,combined with the corresponding constitutive equation,the stability evaluation of landslide progressive failure process is carried out.3)The stability evaluation indexes of landslide multi-parameter points and planes are established,four evaluation methods of landslide stability(MTM,CSRM,SDM,CDM)are introduced in detail,and the progressive failure process of landslide is described with multi-parameter indexes.For the critical state of landslide moving forward,the evolution characteristics of multi-parameter indexes of the whole process of landslide point and plane body are revealed.(4)A new constitutive model is introduced,and its mechanical parameters and basic equations are introduced in detail.Based on the partial strength reduction,the constitutive model and the ideal elastic-plastic model are introduced to describe the progressive failure process of the critical state of landslide.5)Based on the elastic-plastic model slice method,the constitutive model slice method and the stress theory method combined with the multi-parameter stability evaluation,this paper analyzes the concrete Fang County landslide,the evolution law of force and displacement is analyzed from different angles.(6)In fangxian county landslide as an example,this article through the stress points method and numerical calculating and analyzing the theoretical solution of the landslide stability evaluation and combined with multiple parameters,each phase of fangxian county landslide stability evaluation,as the critical state forward,stability,decrease of the landslide destruction of institution transference form unceasingly,finally by local damage development for the overall destruction.