Application Of Finite Element Limit Equilibrium Method In Stability Analysis Of Loess Slope

The slope of the loess slope is steep,the joint are developed,and the gully is deep.Under the action of earthquake,landslide instability is easy to occurmany.so the instability of damage is more complicated than the general slope.At present,a lot of the slope stability analysis makes the loess slope instability phenomena occur frequently,which makes the analysis method of the loess slope stability have important practical significance.Any single theory method has its limitations.Therefore the finite element combining with the limit equilibrium method in the loess slope solution is recommended.This article selects the way coupling the finite element method with the limit equilibrium method,which introduces the constitutive stress strain relationship to the rule of thirds balance equation.It considers the soil stress-strain relationship to makecalculation more accurate and gives attention to the orthostatic characteristics of the loess to make the sliding surface shape searched more conforming to the actual situation of the loess region.The following conclusions are obtained by trial calculation,factor analysis and case study:(1)This paper studies the differences and applicability of the slope stability analysis methods,and discusses the rationality and superiority of using finite element limit equilibrium method in the loess slope stability analysis.(2)Studying the rule of the cracks of the loess slope shoulder,discussing the influence of slope form(the high slope,slope ratio,slope ratio)the soil parameters(angle of internal friction and cohesion)and the dynamic acceleration to the location and depth of the shoulder slope crack to Provide guidance for the prediction of crack position.Analysis results show that the cracking of the slope shoulder position and depth is a result of the combined action of the slope rate,the slope height,the rate of slope top surface,the soil parameters and structural joints.The slope shape has an effect on the seismic stability of the slope,and the response of the convex slope is greater than that of the single slope(3)Using the finite element limit equilibrium method combined imbalanced thrust method take a comprehensive analysis of the stability of the slope where Zhang Jiazhuang tunnel of Lanzhou-Xinjiang high-speed railway lives.In the limit equilibrium method to determine sliding surface,Combining the imbalance thrust method checking the safety factor and the potential sliding surface of the sliding force to determine the design value of the slope under earthquake based on the potential sliding surface provides a reliable theory basis for slope reinforcement.