The Mechanical Property Study On Emulation Concrete And Numerical Analysis On Dynamic Dam Model

With the development of the national economy,especially supported by the policy of the Great Development of the West and the Power Transmission from West to East,exploitation and utilization of water power has stepped into the key development stage during the first half of present century.A batch of dams which are 100-300 metres concrete dams in the world have being constructed in southwestern China. These high dams lie in the High-intensity Earthquake Area,where geological condition is very complex and earthquake acceleration is high.At present,there is little knowledge for people about nonlinear dynamic response,damage process,damage mechanism and probable failure modes for high concrete dams which are in the high-intensity earthquake.Therefore, the dynamic structural model test and numerical analysis are important means to know nonlinear dynamic response and probable failure modes for high concrete dams.This paper makes deeper research for mechanical property and constitutive model of emulation concrete in model tests. Meanwbile,numerical analysis for emulation concrete dynamic character which is using of constitutive models in model dam test is employed.The main works of this paper are as follows:1.The mechanical property and various parameters of emulation concrete are analysised in order to gain our ideal emulation concrete.The uni-axial compressive and tensile tests are performed on the SANS electrofluid machine.On the basis of experiments,the relationship in curing time, mix ratio,curing temperature, strength and deformation characteristics are studied systematically and completely.At the same time,tensive & compressive constitutive model of emulation concrete are established based on normal concrete's.2.The direct shear tests and three-point beam tests are employed to measure the shear strength and fracture toughness and study their corresponding variation law.And research on strain rates effect on tensive and compressive constitutive,especially damage mechanism of emulation concete in dynamic load.3.Numerical Analysis: Static analysis is used in both empty reservoir and full reservoir situation in nonlinear constitutive model of emulation concrete,in order to get the distributing of the stress and the displacement. At last, based on the numerical analysis is carried out to calculate the displacement and stress under the earthquake load and research the dam's dynamic crack and weak sections. All of work of this paper is combined with the practical project and the research conclusions provide the practical reference to the design of similar projects. At last,after drawing the conclusion of the work of the paper,the expectation of advanced research is put forward.