A New Method For Calculating Slope Stress And Strain

Slope stability research has always been a key research topic of concern to researchers.The progress of slope research mainly depends on the development of geotechnical mechanics.Slope instability will not only destroy the project itself,but also bring direct or indirect harm to people's lives and property.Landslide is a kind of geological phenomenon,which is represented by the space-time evolution process of geological structure,and also a mechanical phenomenon,which is represented by the deformation,failure,instability and movement of rock and soil.In the process of slope failure and instability,the distribution of force and stability analysis is worth studying.Traditional slope stress-strain analysis mostly uses finite element numerical analysis methods.However,these numerical methods calculate the stress as a point stress,that is,point generation(for 2D)or point generation(for 3D).The different size of the unit has an influence on the calculation result.In addition,for the nonlinear problem,the initial stress(or initial strain)method is used to approximate the calculation,so the convergence standard is different and the calculation results are different;for some simple material stress problems,The theoretical solution was obtained by dimensional analysis.In view of the shortcomings of traditional numerical calculation methods in slope stability analysis,in order to solve the above problems,the specific research work of this thesis is as follows:(1)Review and summarize the status quo of research and analysis of landslide stress distribution and stability by domestic and foreign researchers,and point out the inadequacies and development trends of traditional methods.(2)Based on the traditional stress calculation,this thesis proposes a method widely applicable to solving the theoretical solution of material stress.This calculation method can be accurate under the assumption that the material stress satisfies the micro-equilibrium equation and the stress boundary condition.Solve the stress distribution of the material.Taking the slope and cantilever beam as examples,the theoretical solution of the slope and cantilever beam under different boundary conditions is obtained.(3)Introduce a new shear stress--strain constitutive model,and introduce the basic equations of the shear stress--strain constitutive model,the parameter determination method and the critical stress---the strain criterion.The characteristics of the post-destruction area of rock and soil are introduced.The model can describe the behavior characteristics of rock and soil,and it can be used as reference for virtual internal bond model,spring model and discrete element method.(4)Establish a new evaluation method of slope stability based on the new shear stress-strain constitutive model,and compare the results with the results of traditional ideal elastoplastic model.The new shear stress-strain constitutive model can be known.Considering the softening characteristics of rock and soil materials,the stress increases with strain when the stress exceeds the peak stress,which is consistent with the mechanical properties of general rock and soil materials.This thesis introduces the calculation method of the traditional stability coefficient,and also defines four new stability factors,and gives the calculation method.They are: Integrated Sliding Force-Anti-Sliding Force Method(CSRM),Main Thrust Method(MTM),Integrated Displacement Method(CDM)and Surplus Displacement Method(SDM).(5)Using the traditional landslide stability calculation method and a stability calculation method based on the boundary and equilibrium conditions of the slope stress theory,combined with the new shear stress-strain constitutive model to stabilize the Wangjialing landslide Analysis,through the comparative analysis of the two methods,we can see that the theoretical solution of slope stress based on boundary and equilibrium conditions is also applicable to the calculation of landslide stability,and is closer to the actual project.