库水重力坝无限地基系统地震响应分析

摘要

为了分析库水以及无限地基辐射阻尼对库水重力坝无限地基系统的地震响应影响，通过比例边界有限元法、有限元法以及无限单元法计算了库水重力坝无限地基系统的响应。基于SBFEM 计算上游坝面库水压力，利用无限单元法分析无限地基辐射阻尼的影响，以 Koyna 重力坝为研究对象，给出了重力坝在不同地基弹性模量条件下地震位移时程以及应力的响应，随着地基弹性模量的增加，坝体响应增加。与无质量地基模型的计算结果进行对比，考虑无限地基辐射阻尼的计算结果较小。%In order to analyze the effect of reservoir water and infinite foundation radiation damping on the seismic response of reservoir water-gravity dam-infinite foundation system,the response of reservoir-gravity dam-infinite foundation system was calculated with the scaled boundary finite element method (SBFEM), finite element method (FEM)and infinite element method.The reservoir water pressure at the upstream surface of gravity dam was calculated based on SBFEM,and the effect of the infinite foundation radiation damping was analyzed with the infinite element method.Through taking Koyna gravity dam as the research subject,the response of seismic displacement time history and stress of gravity dam under the condition of different elastic modulus of foundation was obtained.With increasing the elastic modulus of foundation,the dam response increases.Compared with the calculated results from the massless foundation model,it is found that the calculated results with considering the effect of infinite foundation radiation damping are smaller.