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关山隧道断层破碎带三维有限元地震动力响应

Keywords: 隧道工程,动力响应,断层破碎带,地震,有限元

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Abstract:

以华庄公路关山隧道为研究对象,通过建立大型三维有限元模型,采用一种人工构成的短时间正弦扫描Johnson/Epstein地震记录进行地震动力分析。该记录具有在较短时程内包含较大的实际地震频率范围的特点,从而减小计算分析的持续时间。通过对3种工况(不设置抗震缝、设置2条和3条抗震缝)计算,结果表明关山隧道衬砌结构的动力响应以横向的受力特征为主,拱顶处横向加速度和横向位移最大,仰拱及拱底处横向加速度峰值和横向位移峰值较小,设置3条抗震缝时的围岩体位移和应力明显优于其他工况,该设计方案能满足8度区抗震要求。

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