Mountain Highway Slope Stability Of The Bridge-based Analysis And Design

This paper takes of the changji highway as the project backing,takes the typical pitch bridge foundation as the research object,in the widespread collection of related engineering data foundation,using the finite element value simulate analysis technology,deeply studies the analysis and design of the slopes bridge foundation stability on the mountain expressway,which is special and urgently awaits to be solved,provides the scientific basis for the pitch bridge foundation design.From the mechanical features of the slope bridge foundation and the interaction between bridge-based and the slopes,I do the main work in the following areas.1.FEM analysis of slope bridge foundation loading capacityBased on plastoelasticity theory,the carrying capacity of bridge foundation on slope is obtained by FEM.The model is brought up for carrying capacity which includes nonlinear computation.The analysis of slope bridge foundation carrying capacity under different design parameters is presented contrasted with test data.The stress characteristics of slope bridge foundation are put forward and the gist is provided for bridge foundation design.Using orthogonal design idea,arrange numerical simulation test,do sensitivity orthogonal analysis on the mechanical indicators of the slope of the bridge,come to the contribution of the design parameters to slope bridge foundation,and come to the slope bridge-bearing capacity reduction factor formula through regression analysis.2.Stability analysis of the slope bridge foundationAgainst the characteristics of socketed pile stability,study the foundation from the pile under the conditions of different slenderness ratio and the level of lateral load, discuss the impact of lateral mountain load on the bridge of internal force,deformation and stability,study the stability of the slope bridge foundation in different design parameters,so as to determine the buried depth of bridge,provide calculation ways and design ideas to the high slope of the bridge in the design of buckling.3.Analysis of slope stability under bridge foundation loadBased on the strength reduction theory,proposed the way that changing step search method to solve the slope stability safety factor,the problem of strength reduction extended from 2D to 3D space,and avoid determining the width of pile of two—dimensional method,and better come to the stress and strain distribution,raised whether plastic will be made through the district for slope safety factor as a standard, provide new ideas and methods for stability evaluations of the complex boundary slope. The project's research results not only provide a theoretical guidance to the design and construction of the slope bridge foundation,but also lay foundation for the relevant norms amendment.4.Optimum design of slope bridge foundationStarting from the real problems,using structural analysis theory,express the optimization problem of slope bridge foundation by using mathematical expression, set a mathematical model,raised the two objective functions of the optimization design for the slope bridge:the first is the allowing capacity of the pile,the second is the smallest structure,and using effective method to determine the weighted coefficient of the objective function.Against the optimal design features of the model discrete variables,introduct elite ants optimization strategy,and give the basic steps of optimization algorithm in the form of pseudo-code.