Stress-strain Three-dimensional Finite Element Analysis Of Rockfill Concrete High Arch Dam

Rock filled concrete mainly uses the high fluidity characteristics of selfcompacting concrete to fill the gaps between large-size rock filled bodies,so as to form high-strength and continuous complete concrete.At present,it is widely used in water conservancy engineering construction,but most of it is used in gravity dam,and there are few practical projects applied in arch dam,and all of them are medium and low arch dams,there is a gap in the construction of rock filled concrete high arch dam.Based on the physical and mechanical properties of rock filled concrete,a three-dimensional finite element model of the proposed high arch dam is established,and the temperature field and stress-strain of the dam are calculated and analyzed.The temperature distribution and stress-strain law of the dam can be understood to a certain extent,which provides a certain reference for the design and construction of rock filled concrete used in high arch dam.In this paper,based on the physical and mechanical properties of rock filled concrete in Guizhou area,three-dimensional finite element analysis of rock filled concrete high arch dam is carried out.The main research contents are as follows:(1)the mechanical test of rock filled concrete is carried out,and the mechanical parameters such as compressive strength,elastic modulus and splitting tensile strength of rock filled concrete are obtained;(2)Based on the mechanical test parameters of rock filled concrete,the three-dimensional finite element analysis of rock filled concrete high arch dam is carried out by considering the two schemes of integral pouring and parting.The temperature field,stress and strain distribution of rock filled concrete high arch dam during construction and operation are obtained;(3)According to the requirements of the code,the equivalent stress of the dam body is calculated,and the maximum stress of the dam body is obtained;(4)By comparing the stress of dam body under the condition of integral pouring and joint separation,the conclusion is drawn,which can provide reference for the design and construction of rock filled concrete high arch dam.The finite element calculation results show that the temperature rise of hydration heat of rock filled concrete high arch dam is low,and the temperature field distribution is mainly related to the local air temperature and warehousing temperature.The air temperature has a great influence on the surface temperature of the dam body,and the maximum temperature of the dam body occurs inside the dam body.Under the basic load combination,the stress field and displacement distribution of the dam are similar to those of the normal concrete.The stress concentration of the dam body is obvious.After the equivalent calculation of the stress,the stress result of the dam body is still too large under the condition of integral pouring,and the stress result of the dam body is significantly reduced after the splitting,but it is slightly larger than the stress standard of the arch dam design code,however,further measures can be taken to realize the application of rock filled concrete in high arch dam.