【摘要】 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。更多还原

【Abstract】 In order to research the safety reliability of underwatertunnel subjected to the horizontal and vertical earthquake,Fast Lagrangian Analysis of Continua was used for seismic time history analysis and the large-scale geotechnical software FLAC3D was adopted for a shallow soft clay ground underwatertunnel’s numerical calculation.The results indicate that the tunnel residual horizontal displacement is 15.0 mm,and vertical displacement is 31.0 mm,but it generates small relative horizontal and vertical displacement;the whole stress and internal force change a little,and the maximum stress amplitude is 5% ;and the natural frequency of tunnel is 0.65 Hz.Overall,the probability of shear,tensile and resonance failure of tunnel is small,and it is safty and reliability.This conclusion can be used for the design of the same type of tunnel.更多还原