白鹤滩拱坝基础垫座方案优化研究

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Abstract As the foundation conditions of Baihetan arch dam are complicated，large pedestal should be designed to improve the stress distribution. Current research on reinforcement evaluation of dam foundation and abutment generally relies on engineering experience，and there is no comprehensive and reliable pedestal evaluation criteria yet. A new optimization design method for dam pedestal is presented. Stability of pedestal and its affec to dam are both considered，and thus the optimal scheme is verified. This method combines various factors，such as displacement，stress，plastic zone and anti-slide safety factor. Besides，unbalanced force is used to analyze dam heel cracking，and plastic complementary energy(PCE) is applied in pedestal global stability evaluation. As measurement of structural local failure，unbalanced force is effective in predicting location and direction of crack propagation in dam heel. PCE is a scalar norm of unbalanced force，which is suitable for structure stability analysis. Four pedestal design schemes are compared in the meaning of dam displacement，dam heel cracking，pedestal stability and anti-slide safety factors. The optimal scheme regards the pedestal as a part of dam and sets joints on its upstream surfaces.

Key words： foundation engineering high arch dam pedestal optimization design dam heel cracking unbalanced force

Received: 30 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS1/2641

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