中文摘要：

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．

英文摘要：

Water inrush is the biggest safety risk during subsea tunnel construction stage, which often occurs in unfavorable geological bodies indicated by research. In order to understand and control the construction water inrush risk of unfavorable geological bodies in subsea tunnel, the type, factor and mode of water inrush in subsea tunnel are analyzed, the mechanism of construction water inrush of unfavorable geological bodies in subsea tunnel is analyzed, and failure of rock around tunnel induced by deformation is considered as the most reason, so it＇ s very important to study the rock covers of no damaged, then the water inrush coefficient of water-resisting key strata is introduced and used as the criteria of water inrush judgment in subsea tunnel. In the case of F1 weathered slot in the left line of Xiamen Subsea Tunnel, the influence factors of water inrush coefficient are discussed, and some useful conclusions are given. At last, water inrush coefficient is applied in the prediction of water inrush in F4 weathered slot, and be proved feasible and applicable.