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随着我国城市轨道交通建设的飞速发展,盾构隧道之间近距离相互穿越工程将会越来越多。武汉市轨道交通2号线与4号线在洪(洪山广场)中(中南路)区间为4孔紧邻交叠隧道。根据实际工程特点,将其简化为不同间距的4孔平行重叠和4孔垂直交叉隧道,分别建立其三维计算模型,分析了紧邻多孔交叠隧道的三维地震响应,其中考虑了不同地震波幅值、隧道间距、隧道空间位置、隧道管片横、纵向差异以及紧邻多孔盾构隧道间加固层的影响,从结构变形和受力两方面评价了其抗震性能。计算分析表明:(1)隧道间距对隧道地震响应影响不显著;(2)4孔垂直交叉隧道的抗震性能要优于4孔平行重叠隧道;(3)紧邻多孔交叠隧道具有良好的抗震性能,满足抗震要求。其研究成果可为今后类似工程的抗震初步设计提供参考。
With the rapid development of urban rail transit construction in our country, there will be more and more projects of crossing tunnels between shield tunnels. Wuhan Metro Line 2 and Line 4 in Hong (Hongshan Square) (Central South Road) interval of 4 holes immediately adjacent to the overlapping tunnel. According to the actual engineering features, this paper simplifies the four-hole parallel overlapped and four-hole vertical cross-over tunnels with different pitches. The three-dimensional calculation models are established respectively, and the three-dimensional seismic response of the adjacent porous tunnels is analyzed. Considering the amplitude of different seismic waves, Tunnel spacing, location of tunnel, transverse and longitudinal differences of tunnel segments, and the influence of reinforcement layer in the immediate vicinity of porous shield tunnel, the seismic performance of the shield tunnel is evaluated from both structural deformation and stress. Computation and analysis show that: (1) The tunnel spacing has no significant effect on the seismic response of the tunnel; (2) The seismic performance of 4-hole vertical cross-over tunnel is better than that of 4-hole parallel overlapping tunnel; (3) , To meet the seismic requirements. The research results can provide reference for the preliminary design of similar projects in the future.