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高烈度地震区山岭隧道洞口减震问题的数值模拟研究

, PP. 100-104

Keywords: 隧道工程,减震,数值模拟,地震反应,高烈度地区

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Abstract:

采用有限差分软件FLAC3D3.0研究隧道洞口段的抗震设防长度和衬砌刚度对地震反应的影响,分析设置横向减震层、纵向减震层和加固围岩对衬砌结构的减震效果,并总结山岭隧道洞口减震的思路和措施。结果表明一般进入洞内25~30m后地震放大效应开始趋于平稳,该距离可为确定洞口抗震设防长度参考;衬砌刚度过大在一定程度上将加大震害;设置横向减震层和纵向减震层都能使地震反应明显减弱,使应力分布更趋均匀,且前者效果明显好于后者;通过设置锚杆增强围岩整体性,可有效减少作用在衬砌上的地震荷载,且对软质围岩效果更佳。最后,提出山岭隧道洞口必须综合减震,衬砌应该刚、柔平衡。

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