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基于隔水关键层突水系数法的海底隧道施工突水危险性分析

Keywords: 海底隧道,突水,隔水关键层,突水系数

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Abstract:

突水是海底隧道施工阶段最大的安全风险,而且突水事故多发生在不良地质段.为了更好地控制海底隧道不良地质体施工突水风险,本文对海底隧道的突水模式及其影响因素进行了分析,指出海底隧道突水事故多与隧道开挖引起的围岩变形破坏有关,而未破坏岩层的研究对于突水的控制至关重要.因而,重点对海底隧道不良地质体顶板突水机理进行分析,引入隔水关键层的概念及判别条件,将隔水层关键层突水系数作为海底隧道顶板突水判断标准,以厦门海底隧道左线F1风化槽为例,对隔水关键层突水系数的影响因素进行分析,并将突水系数法应用于F4风化槽突水预测,证实了突水系数法的可行性和适用性.

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