The Comprehensive Method Above Overloading And Strength Reducing For Finite Element Analysis Of The Deep Stability Of Gravity Dam

Among the design and construction of numerousreservoir dams, gravity dam is widely recognized in the industry and hasbecome the main dam type in the domestic construction of high dam atpresent because of its advantages such as strong adaptability, convenientconstruction, good for power generation and flood discharge, high degreeof safety.But in many cases, not all of dam foundations are integrity, whichmake dam construction very complex, so the security of damcannot get one hundred percent guaranteed. When damwrecking happened,not only the dam structure would be destroyed, but also the people’s lifeand property security in dam downstream area would be under a seriousthreaten, which may cause tremendous loss to the economy, so it makesanalysis approach on the stability and reliability of gravity dam become animportant but frequently encountered problem in hydraulic structure andneed to be constantly in-depth discussion.Since the new century, a large number of researchers have engaged inscientific research on the problem of stability and reliability of gravity damat home and abroad, a lot of computing methods that analyzing the safety factor of stability and against deep sliding of gravity dam structure havebeen found, however, there is still no a unified, standard, accurate andobjective evaluation method in the industry. In recent years, with theincreasing popularity of computer,Finite element method (FEM) graduallybe accepted by professionals. Overload method and strength reductionmethod that widely used in the finite element method to find thecorresponding safety factors think about the influence of single factorchange about water load and the material strength separately. However, theanti-sliding stability of gravity dam will be influenced by not only waterload but also the dam foundation material strength (comprehensive methodabove overloading and strength reducing).Firstly, this paper generalizes the research status of deep stabilityagainst sliding of gravity dam, mainly introduces the comprehensivemethod above overloading and strength reducing and discusses the theoryrationality of the method. Secondly, the finite element method isexpounded, and the using process and method of the large-scale finiteelement analysis software (ANSYS) are illustrated. Finally,19#section ofwudu roller-compacted concrete gravity dam is modeled by the large-scalefinite element analysis software (ANSYS), the security and stability ofdeep anti-sliding are analyzed by using the finite element comprehensivemethod above overloading and strength reducing, finite elementoverloading method and finite element strength reduction method. In order to prove the results of comprehensive method above overloading andstrength reducing is reasonable, the safety factor of global stabilitycalculated by comprehensive method above overloading and strengthreducing, overload method, strength reduction method are compared withthe model test results.This paper takes the specific engineering practice into account, thefinite element comprehensive method above overloading and strengthreducing, finite element overloading method and finite element strengthreduction method are analyzed to calculate the safety factor of19#sectionof wudu roller-compacted concrete gravity dam by using finite elementanalysis software (ANSYS). Lastly, the rationality and reliability ofcomprehensive method above overloading and strength reducing arediscussed and the results showed that the safety factor calculated by thismethod has practical application value.