The Application Of Generalized Plasticity Model On The Analysis Of Concrete Face Rockfill Dam

Concrete face rockfill dam with many of advantages, such as low investment, short construction period, safe and reliable, simple construction, strong adaptability have become one of design major dam type. Stress and deformation of rockfill dam in different working conditions such as construction and reservoir filling stages and earthquake conditions need to be considered. In resent years, in rockfill dam, static analysis is mainly based Duncan-Chang model, equivalent linear model is used in dynamic analysis and permanent deformation analysis is mainly based Shen Zhujiang permanent deformation model. These analysis methods have been widely used in geotechnical engineering and got a lot of research, a wealth of experience in the model parameters and calculation program development had been accumulated, an important reference had been provided for engineering design. Different models and parameters used in the calculation process of the concrete face rockfill dam will result in a complicated calculation and an unreasonable calculation.Only need a set of model parameters, the static and dynamic analysis can be completed by the generalized plasticity model in the framework of generalized plasticity theory. The model is proposed for sand liquefaction. The generalized plastic model has been improved and developed by Zou Degao considered the pressure into generalized plastic model for coarse grained soil, and successfully used in practical engineering simulation. Taking into account the study of the adaptability of improved generalized plasticity model for complex stress path is inadequate, in this paper, the adaptability of the improved generalized plastic model for the complex stress path is validated, and then an actual project was calculated to compared the improved generalized plasticity model with the commonly used model (Duncan-Chang model, equivalent linear model, Shen Zhujiang permanent deformation model), the improved generalized plasticity model was verified.The present research is supported by the National Natural Science Foundation of China (No.51279025),the New Century Excellent Talents funded projects (NCET-12-0083) and the National Natural Science Foundation Major Research Plan Integration Project (No.91215301)". The specific work is as follows: (1) The applicability of improved generalized plasticity model was verified for different stress paths by simulate large-scale triaxial tests; and a small face rockfill dam with measured data was analyzed to verify the reasonableness for the model used in face rockfill dam.(2) Static and dynamic triaxial test for rockfill of the kajiwa face rockfill dam were done by the high-precision and large-scale triaxial apparatus designed by Dalian University of Technology, and the model parameters for the numerical analysis were got.(3) The face rockfill dam was calculated by using the generalized plasticity model and common model (Duncan-Chang model; equivalent linear model; Shen Zhujiang permanent deformation model), the difference of stress, deformation, acceleration and permanent displacement of dam and stress, deformation of face were compared for different models. The generalized plasticity model is verified reasonably to use in face rockfill dam form the comparative result.