Study on the influence of seismic response of high arch dams considering reservoir bottom absorption
The compressibility of reservoir water and the influence of reservoir-bottom silt on the seismic response of the structure are taken into account to establish the high arch dam-reservoir water-foundation system model of Jinping-I Arch Dam,and the feasibility of using the acoustic-solid coupling method to simulate the effect of reservoir water on the dam body is verified by comparing it with the dynamic water pressure calculated by the Westergaard method.The absorption of silt deposited at the bottom of the upstream reservoir is simulated by different reflection coefficients of the reservoir bottom set in the model;seismic records that conformed to the hydraulic code response spectrum were selected as input based on the site conditions,and the response values of dynamic water pressure at the arch crown beam of the concrete dam under the action of vertical-incidence earthquakes with different bottom reflection coefficients were analyzed and studied.The results showed that the magnitude of the bottom reflection coefficient has a significant effect on the dynamic water pressure results at the arch crown beam,and the dynamic water pressure results increase with the increase of the reflection coefficient,and the difference of the dynamic water pressure at the heel of the dam with adjacent reflection coefficients becomes larger.
万方数据
维普
