Roller ComPacted Concrete Gravity Arch Dam 3D FEM Non-linear Analysis

Roller Compacted Concrete(RCC) gravity-arch dam is a dam type with gravity dam section and with arch effect. It is characteristic of not only RCC but also of gravity dam; moreover; it also has a very complicated stress condition, characteristic of arch dam. RCC has a good reputation of quick construction, small cement consumption, low hydration heat and simple construction technology etc. High gravity-arch dam is a hyperstatic structure, which, incorporating site topography and geology, transfers the immense water load to dam foundations with the arch effect. Meanwhile the rock foundation in contact with dam concrete is in elastic and plastic state with great stress. In this way it is necessary to perform 3-dimensional finite element non-linear analysis for high gravity-arch dam. With the development of elastic and plastic theory and extensive application of non-linear finite element analysis, non-linear analysis of gravity-arch dam is facilitated. And development in RCC technology also lays a foundation for RCC dam. Now China has listed RCC high dam construction technology as key scientific item of national importance in the"Eighth Five-Year Plan"and"Ninth Five-Year Plan", and leads the world in such aspects as concrete mixing, layer rolling, temperature control, arch closure grouting and so on. For RCC gravity-arch dam, however, there is still room for improvement in arch closure grouting, shape design, arch effect analysis, dam body material, dam-foundation-water coupling and so on.Relating to the Gomal Zam RCC gravity-arch dam in Pakistan, this paper analyzes dam body stress and displacement with 3-dimensional finite element non-linear analysis. It mainly includes:It takes the contact face between dam body and dam foundation as a contact unit for non-linear analysis with elastic and plastic theories, extending the application of non-linear analysis in engineering area.It researches the stress condition, stress distribution, location of maximum stress and stress control criteria of RCC gravity-arch dam under different load combinations.It researches displacement and dam body deformation extent. And it tries to find a control range for RCC gravity-arch dam displacement by comparing with other international projects.It researches the influence of temperature load on dam body and suggests some measures to control temperature stress.It discusses the sensitivity of dam stress to dam material and foundation rock elastic modulus so as to find a proper material for the project. It suggests increasing foundation elastic modulus so as to facilitate the dam to function in allowable stress range.It performs a dynamic analysis for the dam body with temporal method so as to research the influence of earthquake on stress in dam-foundation system, and to research dam-foundation-water coupling.It researches the influence of arch effect in gravity-arch dam design. It is significant to dam body shape and stress distribution adjustment.