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为了研究水下公路隧道在水平地震动和竖直地震动作用下结构的安全可靠性,采用快速拉格朗日时域有限差分法进行时程分析,并利用大型岩土软件FLAC3D对某浅埋软土地基水下公路隧道进行数值模拟计算。结果表明:双向地震荷载作用下,隧道结构水平残余位移为15.0mm,竖直残余位移为31.0mm,隧道结构顶板和底板之间的水平相对位移、竖直相对位移较小;隧道结构整体应力、内力变化较小,应力幅度最大波动5%;结构自振频率为约0.65Hz。总体上,隧道结构产生剪切、拉伸破坏和共振的概率较小,隧道结构抗震性能较好,结构安全可靠。这些认识可为同类隧道的设计提供参考。
In order to study the safety and reliability of underwater tunnel under horizontal and vertical ground motions, the fast Lagrangian time-domain finite difference method is used to analyze the time-history and the geotechnical software FLAC3D is applied to a shallow buried Soft soil foundation underwater tunnel tunnel numerical simulation. The results show that the horizontal residual displacement of the tunnel structure is 15.0mm and the vertical residual displacement is 31.0mm under the bidirectional seismic load. The relative displacement between the roof and the bottom of the tunnel structure is relatively small and the vertical relative displacement is small. The overall stress of the tunnel structure, Small changes in internal forces, the maximum fluctuation of the stress amplitude of 5%; natural frequency of the structure is about 0.65Hz. Generally speaking, the probability of shear, tensile failure and resonance of the tunnel structure is small, and the seismic performance of the tunnel structure is better and the structure is safe and reliable. These insights can provide reference for the design of similar tunnels.