Stability Analysis And Support Design Optimization Of High Cutting Slope

Due to the needs of economic development in China,highway construction is gradually a dvancing to the western mountainous areas,thus forming more and more high filling and deep excavation slope.Due to the geological characteristics of Guizhou province,in the process of engineering construction,deep cut soil and rock mixed high slope is often formed.And curre nt national standard specification does not stipulate the principle of slope design above 30 m.I n addition,although there are many scholars who study high slope,there are few researches o n high binary structure slope,and the design and construction are lack of corresponding techni cal support.In the design and construction stage of practical engineering,the stability of the sl ope is still determined by using the conventional method of horizontal projection and the limit equilibrium method.Both of these two analytical methods have their limitations in practical a pplication.The finite element analysis method can establish a three-dimensional finite elemen t model of the slope,which can consider the stress-strain property of soil,simulate the constru ction stage of the slope and carry out accurate stability analysis.Therefore,the finite element analysis method should be fully applied in practical engineering.For the complex and tall slo pe,this method should be taken as the main analysis method,supplemented by other methods as a supplementary comparison,so as to make the slope engineering construction safer,more economical and more effective.This article through to dig rock cutting soil mixing characteristics,types and mechanism of the high slope deformation and failure,this paper sums up the common calculation method s of slope stability evaluation analysis and theory,summarizes all kinds of application method s(mainly plane projection method,limit equilibrium method,finite element strength subtracti on)characteristics and scope of application,and put forward its own understanding and the un derstanding.The theory of finite element calculation and Midas GTS,a general finite element software,are introduced,and their theoretical basis and basic ideas are summarized.The const itutive relation of rock and soil mass material,support system and contact surface treatment of soil and rock mixed high slope is analyzed and discussed.The steps of Midas GTS modeling,conditional hypothesis,unit selection,grid division and boundary condition determination are discussed in detail.Meanwhile,the determination of parameters in simulation analysis is anal yzed and summarized.Based on a typical high slope with deep cut soil and rock mixed in Tongren city,the stabi lity of the slope before reinforcement was analyzed by using the method of horizontal projecti on,limit equilibrium and finite element strength reduction respectively,and several analysis methods were compared and summarized.A support scheme determined preliminarily,and th en through Midas GTS software of the reinforced slope is simulated,compared the support be fore and after slope stability coefficient and the displacement and stress strain contours,detail ed analysis of the supporting system plays a role in slope stability,and on the basis of the secu rity,economic optimized the supporting design scheme,hoping to provide some reference for future similar projects.