Gudehus-Bauer Hypoplastic Model Of Rockfill And Its Application To Stress And Deformation Analysis Of Concrete Face Rockfill Dam

Rockfill is a widely used material in water conservancy engineering,and it is also the filling material of face rockfill dam,which bears the main load.This paper mainly introduces the research progress and basic theory of the hypoplastic model,and emphatically describes the parameter determination method and improvement of Gudehus-Bauer sub-plasticity model,and applies the improved Gudehus-Bauer hypoplastic model to the stress and deformation analysis of Concrete Faced Rockfill Dam of Xianyou Pumped Storage Power Station in Fujian Province.Combined with the finite element calculation results and the Shenzhujiang’s model calculation results and some monitoring data,the stress and strain distribution law and the numerical value are quite close to the Shenzhujiang’s model,verifying the improved Gudehus-Bauer model applied to the analysis of the stress and strain of Concrete Faced Rockfill Dam is feasible.The specific research work is as follows:(1)On the basis of reading a lot of literature,Introduced the current development of constitutive models and hypoplastic constitutive models of rockfill materials.(2)The basic concept of the hypoplastic theory and the derivation process of the Wu-Bauer hypoplastic model and the method for determining the parameters in the model are introduced in detail.It is not feasible to apply the Wu-Bauer hypoplastic model to the rockfill materials.(3)The modeling form of the Gudehus-Bauer model and the physical meaning of the eight parameters and its parameter determination method are introduced.The stress-strain fitting curve obtained from the eight parameters is compared with the experimental curve to improve the inadequacies of the model.Mainly for the critical friction angle in the model parameters,α and β vary with confining pressure and increase the body strain term(7)(5)(8)(7)σtrσεtrλ(8)and volume control coefficient λ,making the model more suitable for the simulation of rockfill materials.(4)Applying the improved Gudehus-Bauer model equation to the nonlinear finite element solution of face rockfill dam in Fujian Province Xianyou Pumped Storage Power Station,establishing the relationship between the solution of the equation and the modulus matrix [D],using the midpoint incremental method to simulate the rockfill dam During the construction period and the water storage period loading process,an improved finite element program of the Gudehus-Bauer model was developed.(5)Comparing the improved finite element results of the Gudehus-Bauer model with the results of the Shenzhujiang’s model commonly used in engineering,the two models are consistent in the stress-strain law,and the calculation values are similar,and the measured values are also consistent.This proves that the improved Gudehus-Bauer model is used to reflect the feasibility of stress and strain analysis of rockfill dams.