【摘要】 通过数值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荷载作用下横向内力分布和纵向动力响应特性。结果表明:围岩条件是影响衬砌地震内力的重要因素,围岩越差,地震作用产生的内力越大,其抗震性能越差;在横断面方向,不同围岩条件下衬砌内力均在共轭45°方向最大,为隧道抗震最不利位置;在纵断面方向,隧道位于围岩与断层破碎带接触面时,衬砌地震内力急剧增大;当隧道断面沿纵向远离断层破碎带一定距离后,其内力趋于一个稳定值。研究结果可为穿越断层破碎带隧道结构抗震设防提供参考。更多还原

【Abstract】 The cross-sectional internal force distribution and longitudinal dynamic response characteristics of tunnel through fault fracture zone under seismic load are studied with both dynamic numerical analysis and shaking table model test.Results show that:(1) The condition of surrounding rock is the important factor affecting the internal force of tunnel liner caused by earthquake.The worse surrounding rock conditions are,the more remarkable internal force caused by earthquake produce and the worse seismic performance represent.(2) In the transverse direction,the position of conjugate direction of 45° is the most unfavorable tunnel seismic position;and the maximum internal force in tunnel lining is at the position under different conditions of surrounding rock.(3) In the longitudinal direction,when the tunnel traverses the interface between surrounding rock and fault,the internal force in tunnel lining caused by earthquake increases rapidly.(4) When the tunnel is far from the fault along the longitudinal direction,the internal force of tunnel tends to be a steady value.The research results can provide reference for seismic fortification of tunnel through fault fracture zone.更多还原