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双洞隧道洞口段抗减震振动台试验

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Keywords: 隧道工程,双洞隧道洞口段,振动台试验,损伤累积,裂纹效应

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Abstract:

?以西南高烈度地震区某拟建隧道为背景,开展了隧道洞口段抗减震振动台模型试验研究。通过对有无减震层体系的对比试验,研究了减震层的减震效果;并针对目前振动台试验普遍采用的多次加载方案产生的损伤累积问题进行了分析,同时给出了围岩和衬砌的裂纹发展过程及破坏形态。结果表明:在围岩与隧道之间设置减震层可以有效减弱围岩与结构之间的动力相互作用,从而起到减震效果;在评价结构抗震性能时需要考虑多次加载产生的损伤累积和裂纹效应的影响。研究结果可为结构在地震作用下的开裂分析提供参考。

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