中文摘要：

基于岩体极限平衡理论，分别对海底隧道正常地质段和断层处的突水机理进行了力学分析，给出了隧道突水的临界水压力公式．以翔安隧道2个风化深槽及2个断面为例进行了突水风险计算预测．分析表明：正常地质段，隧道突水临界水压力随着隧道半径的增大而减小，随着围岩的单轴抗压强度的增大而增大，随着隧道埋深的增大而增大；断层处，当破碎带倾角大于或等于围岩内摩擦角时，存在突水的可能，且破碎带倾角愈大、内摩擦角愈小，突水的可能性就愈大．

英文摘要：

Based on the theory of limit equilibrium, a stress analysis was presented to study the waterburst mechanism in normal geologyical condition and fault disruption zone during crossing undersea tunnel, then critical water inrush pressure formula of undersea tunnel was given. Finally, a calculation and waterinrush risk forecast is made in two deep weathered rocks and sections of Xiang＇ an Tunnel. In conclusion, in normal geologyical conditon, critical water pressure decreases with the increasing of tunnel radius, increases with the increasing of uniaxial compressive strength of surrounding rocks and depth of the tunnel respectively; in fault disruption zone, when the obliquity of disruption zone is bigger than or equal to angle of internal friction, waterinrush is likely to occur. And waterinrush is more possible to occur with increasing obliquity of disruption zone and minishing angle of internal friction.