Analysis Of Stability Against Sliding For Gravity Dam Based On Finite Element Method Of Stress Integral Slip Surface Thrust Under Equal Safety Coefficient

Water conservancy is the foundation of the national economy,and the lifeblood of agriculture.In the first half of 21 st century,in ord-er to achieve the two Centenary Goals,the development of water conservancy undertaking has been faced with arduous tasks and severe challenges.At the same time,in order to alleviate the increasingly serious energy supply shortage and environmental problems,people have pay an increasing attention on the development of hydropower resources,especially in developing countries.Gravity dam is a kind of dam which is widely used in the world,it depends on its own weight to maintain stability.In the process of the design and construction,the dam foundation will inevitably encounter the complicated engineering geological conditions,such as fault,weathered crushing zone and gentle dip angle weak interlayer.What's more,the current water conservancy project is generally a large scale development and construction,it is difficult to find a natural dam foundation,which is meet the design requirements.Coupled with technical reasons or other reasons,if the geological conditions of the dam site investigation is not detailed and judgment is not accurate,which will bring significant security risks to the project.Once the dam accident consequences of disaster,it will be a direct threat to the downstream residents life safety Therefore,the stability analysis of gravity dam is an important problem in the design of gravity dams.At present,the stability analysis method of gravity dam is based on limit equilibrium method,finite element method and geomechanical model test.Among them,with the continuous improvement of the finite element theory and the rapid development of computer technology,the finite element method has been attached great importance in engineering design.With the help of finite element software ANSYS and FORTRAN language procedures,we try to find a calculation method of gravity dam stability against deep sliding,this method for stability analysis can avoid the influence of subjective factors on the safety coefficient of judgment.The main contents of this paper include:(1)through extensive reading the relevant literature,understand the research status of stability analysis of gravity dam against deep sliding,and make a summary about the methods mentioned in the literature,mainly divided into the limit equilibrium method and finite element method two categories.(2)draw on the advantages of the existing analysis methods to explore a new method to analyze the deep anti-sliding stability of gravity dam,and the mathematical formula is also deduced.(3)combined with the analysis method mentioned in this paper,the program module is written in FORTRAN language,so that the theoretical method can be applied to the analysis of deep sliding stability of gravity dam.(4)through the example analysis the deep anti-sliding stability of gravity dam;and compared the results with other methods,shows that the method proposed in this paper is reasonable and feasible,can provide certain reference for engineering practice.The main contents and achievements of this paper are analyzed:(1)the finite element analysis model of gravity dam is established by using APDL,and the finite element analysis of stress field is obtained by ANSYS software.(2)extract the finite element analysis of stress data,the first step is to make preliminary data sorting,and then combine the program to calculate the anti-sliding stability safety factor.(3)compared the results with finite element strength reduction method and stress algebra method,show that the method,which proposed in this paper,is used for deep gravity dam stability against sliding analysis is feasible.