为了揭示重力坝坝基体系地震破坏过程，需要同时考虑坝体和地基的损伤破坏。本文建立了较为完整的重力坝-地基-库水非线性动力分析模型，同时利用笔者开发的程序模拟了重力坝地基体系的地震破坏。结合印度Koyna坝震害，研究了坝体和地基岩体均采用损伤模型重力坝地基体系的地震破坏过程。作为比较分析，对坝体采用损伤模型、地基采用Drucker-Prager弹塑性模型进行了重力坝地基体系的地震破坏研究。计算结果表明，地基分别采用损伤模型和Drucker-Prager弹塑性模型，得到不同的破坏模式。坝体地基均采用损伤模型模拟的结果与实际震害接近，能更好反映重力坝地震损伤破坏。%In order to reveal seismic damage and failure process of gravity dam-foundation system, both of dam and foundation damage should be considered. A relatively complete nonlinear dynamic analysis model of gravity dam-foundation-water reservoir system has been developed, while seismic damage and failure of gravity dam-foundation system is simulated by the program presented in this paper. According to the study of Koyna dam subjected to the actual earthquake, the seismic damage process of dam-foundation system is investigated by using damage model applied to dam-foundation system. As a comparative study, the seismic failure of dam-foundation system is investigated by using damage model for dam and using Drucker-Prager elastoplastic model for foundation rock. The result shows that different failure modes are got by using dam-age model and Drucker-Prager model for foundation, and the damage of dam-foundation system which has been simulated by using damage model for dam and foundation is close to the actual damage.
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