【摘要】 以某高速公路小净距隧道为依托,对爆破荷载下相邻隧道的影响进行了数值分析。计算中,岩土本构模型为理想弹塑性模型,瑞雷阻尼的阻尼比取0.05,采用粘滞边界条件模拟动力计算边界条件。分析重点是后行洞爆破,对中夹岩振速的影响和对先行洞衬砌应力及振速的影响。结果显示,先行洞对后行洞爆破有放大作用,随着净距的增大,其放大作用呈衰减趋势。当两隧道净距越小,中夹岩振速越大,当隧道净距变小时,离爆源较近处中夹岩振速增加幅度较大。更多还原

【Abstract】 Dynamic response of twin closely-spaced tunnels of an express way to blast loads is numerically investigated.The consititutive model of rock is assumed to be ideal elastoplastic.The ratio of the Rayleigh damping is 0.05.Moreover,the dynamic boundary condition is assumed to be Viscous.Emphasis is focused on the vibrate velocities of the folder rock and the liner of the advanced tunnel by the blast on the followed tunnel.Numerical results show that the amplitudes of the response factor of the advanced tunnel liner increase with the increasing of the space of two tunnels.Furthermore,the vibrate velocity of the folder rock increase with the space.更多还原