Numerical analysis of stress and deformation of concrete face rockfill dam based on the sub-modeling method

• 1、College of Hydraulic and Hydropower Engineering, Xi\'an University of Technology, Xi\'an 710048
• 2、College of Hydraulic and Hydropower Engineering, Xi'an University of Technology, Xi'an 710048,China
• 3、College of Civil and Hydroelectric Engineering, China Three Gorges University, Yichang, 443002, China

Abstract： In this paper，the following works are done. The mid-point incremental method is used to simulate a CRFD project called Miaojiaba by 3D FEM analysis based on Duncan-Chang (E-B) nonlinear constitutive model and its filling construction and retaining water process is also considered. As a result, a corresponding general law of the dam's stress and deformation distribution during the construction and storage period is obtained, Judging from the view of the dam structure, the rockfill dam body works reliably. In order to get more accurate results of the face and its joints' stress and deformation, the developed 3D sub-model method is applied to the calculation with the coupling thin-layer element to simulate the specific boundary between face and cushion. According to the results of engineering example, the stress and deformation distribution of the dam conforms to the general law. The concrete face also has a normal stress and deformation law.The deformation of transverse joints and peripheral joints is small, which indicates that the concrete face works well and safely. At the same time, it is furtherly proved that the sub-modeling method with the coupling thin-layer element to simulate the contact face is feasible and believable.

Keywords： concrete face rockfill dam Duncan-Chang（E-B）model coupling thin-layer element 3D sub-modeling method stress and deformation