Numerical Analysis And Study On The Dynamic Stability Against Sliding Of High Concrete Dam

With the rapid development of China’s national economy, vigorous development of hydropower energy, which greatly affects industry and people’s daily life, has become our country’s major strategy. Southwest of china are rich in water resources, which have ushered in the height of construction. A Large number of high concrete dams are built or will be built in the southwest of China. However, complex geological conditions and being part of the shaky place make the seismic design and safety operation of the construction full of tremendous challenges. As an important component of seismic safety assessment, the importance of dynamic stability against sliding of concrete dam is self-evident. Based on gravity dam and arch dam, two kinds of typical dams, the dynamic anti-sliding stability is analyzed through numerical simulation.Based on a hyperbolic relationship between shear stress and shear deformation, user subroutine FRIC is compiled to define nonlinear frictional behavior for the concrete crack surface. The subroutine realizes the function of3D Goodman element and the effectiveness of the subroutine and the influence of parameters are also verified by an example. The subroutine is also used to simulate crack surface which is assumed that a interpenetrate crack surface has been formed in a gravity dam crest under a main shock. According to the numerical results, sliding and deformation characteristics of the dam crest is analyzed.The way of dynamic contact is used to simulate the interaction of contact surface to study the dynamic stability against sliding of the blocks on the arch dam abutment. The residual sliding displacement of the blocks after the earthquake is taken as the standard to measure the dynamic stability against sliding. The residual displacement and dynamic response of the blocks under different overload earthquake is analyzed and an overload coefficient which is residual displacement mutation point is considered as the safety factor of arch dam-foundation system. And according to it, margin for safety against sliding is determined.