摘要
应用比例边界有限元方法进行了坝-水库-无限地基的动力相互作用分析。深入研究了无限地基刚度变化以及地基非均匀性对大坝地震响应的影响。计算了不同的均匀地基刚度和地基刚度随深度变化情况下Koyna大坝的频响曲线以及地震作用下大坝的时程响应。计算结果表明,地基刚度和不均匀性对大坝地震响应产生重要影响。对于均质地基刚度增加时,坝的地震响应随之增加;对于地基刚度随深度增加的不均匀地基,坝的地震响应增加迅速。此外还讨论了工程中广泛应用的无质量地基模型对于相互作用分析的适用性问题。
Effect of dynamic dam-reservoir-foundation interaction, particularly, foundation stiffness and foundation anisotropy on the seismic response of concrete dams was studied. The scaled boundary finite element method presented by Wolf and Song was employed for this investigation. Numerical analyses of the complex frequency response and the time history earthquake response of Koyna dam for various cases of foundation stiffness and foundation anisotropy were performed. It was found that the foundation stiffness and foundation anisotropy play important role in the interaction analysis. The seismic response of dams grows with increase of foundation stiffness especially, when the foundation stiffness increases along with the depth. In addition, the applicability of the widely used massless foundation approach to the dam-foundation interaction analysis is discussed.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2005年第7期819-823,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(50139010)
关键词
混凝土坝
无限地基
地震响应
比例边界有限元
concrete dams
unbounded foundation
seismic response
scaled boundary finite element method
