Improvement Of Janbu Method And Bishop Method And Application In Practice

At present,landslide,debris flow and other natural disasters increase year by year,a serious threat to people's lives and property safety.Therefore,more and more scholars pay more attention to the study of landslide and its stability.But there are some problems in the traditional Limit equilibrium method,such as Bishop method,Janbu method and transfer coefficient method and so on:First of all,assume that the slider body is rigid and does not consider deformation;Second,Stability factor definition is defective;Third,these measures have been adopted the not rigorous strength reduction method.The researchers are eager to present a simple and accurate method to overcome the above problems.On this basis,a new system of landslide stability calculation which is proposed by Professor LU Yingfa(Include:The new joint constitutive model,The new stability factor calculation method,The new slice method and The new method to take the sliding plane as a boundary condition of FEM).In this article,the author of the study period,contact with a lot of landslides,through access to detailed information,carefully study the theoretical knowledge of the Xiangjiapo slope to the detailed calculation and analysis.Based on this system,this paper mainly studies the following aspects.Firstly,This article introduces the current methods of landslide stability analysis,and introduces their assumptions,specific procedures,application conditions,advantages and disadvantages.The current method can be said to be "experience" and accumulated some experience in the project.Secondly,this article introduces professor Lu Yingfa's new constitutive model,including the parameters of basic equations,a new constitutive model of the decision and critical state analysis.In addition,the calculation method of the stability factor of landslide.And proposed an improved method in the traditional method and the new definition method of the constitutive model are presented.Comprehensive slide-sliding resistance method(CSRM),main thrust method(MTM),comprehensive displacement method(CDM)and redundant displacement method(RDM)are introduced in detail.Based on the calculated results,the detailed results are as follows: The deformation mechanism and the destructive characteristics of Xiangjiapo landslide are analyzed.Thirdly,In this article,the traditional stability calculation method and the new constitutive model are used to calculate the Xiangjiapo,and USES the mature finite element software to simulate and analyze the landslide GEO-SLOPE deformation and stress.By comparison,it is concluded that the new calculation method is also suitable for the calculation of landslide.Finally,the basis of the sliding surface method is presented in this article to Professor Lu on the use of a new type of method of Xiangjiapo program,Through the introduction of the implementation background,implementation methods and implementation steps,also proved that the new constitutive model can also be applied tofinite element.Compared with the traditional finite element method,the convergence problem is overcome.