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通过动力分析和振动台模型试验相结合的方法,研究穿越断层破碎带隧道在地震作用下沿纵向的动力响应特性,当隧道位于围岩与断层破碎带接触面附近时,衬砌地震内力和应力急剧增大;当隧道断面沿纵向远离断层破碎带一定距离后,衬砌地震内力和应力逐渐趋于一个稳定值。研究表明:断层与隧道轴线夹角为35°~90°时,穿越断层破碎带隧道合理抗震设防长度为隧道跨度的3.5倍,该研究成果可为隧道工程抗震设防提供参考。
Through the combination of dynamic analysis and shaking table model test, the dynamic response along the longitudinal direction of the tunnel broken through the fault fracture zone is studied. When the tunnel is located near the contact surface between the surrounding rock and the fault fracture zone, the internal seismic force and stress of the lining are abrupt Increase; when the tunnel section along the longitudinal distance away from the fault rupture zone a certain distance, lining seismic internal forces and stress gradually become a steady value. The results show that the reasonable seismic fortification length of the tunnel crossing the fault zone is 3.5 times of the tunnel span when the angle between the fault and the tunnel axis is 35 ° ~ 90 °. The research results can provide a reference for the seismic fortification of the tunnel project.