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强震区高拱坝抗震问题的研究十分重要,高拱坝静力稳定研究和极限抗震能力复核,是确保地震后不发生库水失控下泄的关键课题之一。采用物理模型试验与数值计算的方法,根据汶川震后新核定参数,并考虑降强因素的影响,对沙牌碾压混凝土拱坝进行静动力分析和复核。通过三维地质力学模型综合法静力破坏试验,研究拱坝坝肩在正常荷载作用下的稳定安全性,得到沙牌拱坝坝肩综合稳定安全系数为3.76,建议对两坝肩开裂较严重区域进行加固处理。在此基础上,基于反应谱理论进行三维有限元动力分析,将应力成果导入开发程序由Drucker-Prager(D-P)和Mohr-Coulomb(M-C)准则对加固后的沙牌拱坝进行动力复核计算,并研究大坝的开裂情况和极限抗震能力,计算结果表明,沙牌拱坝的整体抗震稳定性能良好,仅在万年一遇地震工况下发生坝肩浅表层失稳。研究成果表明,沙牌拱坝坝肩稳定性较高、坝肩加固效果良好,从而在“5.12”汶川地震中表现出超强的整体稳定性和抗震能力,其全面开展的研究工作和采取的工程措施可供国内强震区同类型拱坝工程建设及运行借鉴和参考。
It is very important to study the aseismic problem of high arch dam in strong earthquake area. The study on the stability of high arch dam and the review of the ultimate seismic capacity are one of the key issues to ensure that uncontrollable loss of reservoir water occurs after the earthquake. According to the newly approved parameters after Wenchuan earthquake and the influence of the reducing factors, the static and dynamic analysis and review of Shapai Roller Compacted Concrete Arch Dam are carried out by means of physical model test and numerical calculation. The static stability test of arch dam abutment under normal load is carried out through the static failure test of the integrated 3D geomechanical model. The comprehensive stability safety factor of Shapai arch dam is 3.76. Reinforcement. On this basis, the dynamic finite element method of response spectrum theory is used to analyze the stress results into the development program. The dynamic comparisons of the reinforced Shapai arch dam with the Drucker-Prager (DP) and Mohr-Coulomb (MC) The cracking situation and the ultimate seismic capacity of the dam are studied. The calculation results show that the overall seismic stability of the Shapai arch dam is good, and the shallow surface instability of the abutment occurs only in the once-yearly seismic event. The research results show that the stability of Shapai arch dam abutment is good, and the abutment reinforcement effect is good, so it shows superior overall stability and seismic resistance in the Wenchuan earthquake “5.12”. Its comprehensive research work and The engineering measures adopted can be used for reference and reference for the construction and operation of the same type of arch dam in strong earthquake areas in China.