棋盘石隧道断裂破碎带地震动力响应分析

以棋盘石穿越断层破碎带段隧道为背景，采用理论计算与数值模拟相结合的方法，对棋盘石隧道在汶川波作用下的地震响应分析进行了系统研究。探讨了断层破碎带衬砌在地震荷载作用下的破坏方式，并且把数值模拟结果与汶川特大地震震害的公路隧道进行对比分析。结果表明:用松动圈折减系数法估算出衬砌最大弯矩和剪力的数值与数值模拟的结果基本一致，验证了MIDAS/GTS-NX模拟隧道地震时程分析的可行性；同时根据对有限元模型进行时程分析的结果，探讨了断层破碎带处衬砌的破坏方式，并提出合理可行的防治及加固措施。

Seismic dynamic response analysis of fault fracture zonein Qipanshi Tunnel

Based on the background of Qipanshi tunnel crossing fault fractured zone, the seismic response of the tunnel under Wenchuan seismic wave was systematically studied by combining theoretical calculation with numerical simulation. The failure modes of lining in fault fracture zone under seismic load were discussed, and the numerical simulation results were compared with other highway tunnels which were damaged by the Wenchuan great earthquake. The results show that the maximum bending moment and shear force of lining estimated by the method of loose-ring reduction coefficient are basically consistent with the numerical simulation results, which verifies the feasibility of acceleration time history analysis of MIDAS/GTS-NX tunnel. Meanwhile, according to the result of time history analysis of finite element model, the failure modes of lining in fault fracture zone were discussed, and the reasonable and feasible prevention and reinforcement measures were put forward.