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地震基岩面选取对核岛场地地表地震反应影响

DOI: 10.13197/j.eeev.2014.06.113.xul.015, PP. 113-121

Keywords: 核岛场址,软岩场地,地震基岩面,地表地震动

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Abstract:

综合各国核电站抗震设计规范对地震动输入界面土层剪切波速取值的要求,以理想化的水平成层软岩场地作为核岛场地,采用等效线性化模型考虑土的非线性动力特性,采用一维波传法研究了地震基岩面的选取对核岛场地地表地震反应的影响,结果表明随着地震基岩面土层剪切波速的增大,场地地表PGA值相应增大;与理想基岩面输入地震动的地表PGA及地表加速度反应谱β谱相比,以剪切波速不大于700m/s的土层作为地震基岩面是不合适的;以剪切波速2400m/s土层作为地震基岩面时,其地表峰值加速度偏小不大于15%、地表加速度反应谱β谱偏小不大于20%,不同地震基岩面的选取主要影响周期小于1.2s的地表β谱,对周期大于2.0s的地表β谱几乎没有影响.以剪切波速2400m/s土层为核岛场地地震效应分析的地震基岩面是合适的.

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