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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 the earthquake damage process of gravity dam foundation system, it is necessary to consider both dam damage and foundation damage. In this paper, a more complete model of nonlinear dynamic analysis of gravity dam-foundation-reservoir-water is established. At the same time, the program developed by the author is used to simulate the earthquake damage of the gravity dam foundation system. Combined with the earthquake damage of Koyna dam in India, the damage process of the earthquake damage to the dam foundation and the rock mass in the foundation system of the gravity dam is studied. As a comparative analysis, the dam damage model is used, and the foundation is studied by the Drucker-Prager elasto-plastic model for the earthquake damage of the gravity dam foundation system. The calculation results show that the damage model and the Drucker-Prager elasto-plastic model are respectively used for the foundation, and different failure modes are obtained. The simulation results of the dam foundation using the damage model are close to the actual seismic damage, which can better reflect the damage and damage of the gravity dam.