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将强度折减法引入海底隧道安全稳定性分析,并研究了不同埋深和不同水深微风化围岩海底隧道在强震荷载作用下的动力响应规律。结果表明:本文计算条件强震荷载作用下的海底隧道局部破坏安全系数为1.445,整体破坏的安全系数为1.479,发生破坏的位置为右侧墙中部,破坏方式为剪切破坏。随着海底隧道埋深增加,拱顶位移先增大再减小最后增大,仰拱位移不断增大,当埋深大于80 m时,建议对海底隧道围岩进行加固处理。随着水深增加,海底隧道水平位移变化不大,仰拱竖向位移不断增大。
The strength reduction method was introduced into the safety and stability analysis of the subsea tunnel, and the dynamic response of the submarine tunnel with different depths and different depths under strong earthquakes was studied. The results show that the safety coefficient of partial damage of subsea tunnel under strong earthquake conditions is 1.445, the safety factor of overall damage is 1.479, the location of damage is the middle of right wall and the failure mode is shear failure. With the increase of the depth of the tunnel, the displacement of the arch firstly increases, then decreases and finally increases, and the displacement of the arch increases. When the depth is more than 80 m, it is suggested to reinforce the surrounding rock of the tunnel. With the increase of water depth, the horizontal displacement of subsea tunnel changed little, and the vertical displacement of inverted arch increased.