As the key controlling project of long-distance cross-basin water transfer project, water conveyance tunnel plays a significant role in alleviating the regional contradiction between economic layout and water resources distribution. In high seismic intensity areas of southwest China where geological structure is complex and active faults are densely distributed, water conveyance tunnel project inevitably crosses multiple active fault zones. The Xianglushan tunnel of Central Yunnan Water Diversion Project, which crosses the Longpan-Qiaohou fault F10-1, is taken as the research object. The influence of active fault on the anti-dislocation adaptability of the tunnel is evaluated based on the displacement, relative deformation, maximum principal stress, and longitudinal equivalent internal force and other factors of key parts of the tunnel. The effect on reducing the internal force and deformation of lining is also verified via numerical calculation. Results unveil that affected by fault movement dominated by strike-slip, one sidewall of the tunnel is in tension, with a small tensile stress around 5 MPa. The maximum normal and tangential deformation of hinge joint are located in the central section of the fault zone. The adaptive hinge design effectively improves the stress state of lining under dislocation condition. The research findings can be directly applied to the engineering design and construction of water conveyance tunnels crossing active faults, and also provide favorable support for the construction of related engineering tunnels.
Key words
water conveyance tunnel /
active fault /
anti-dislocation design /
strike slip fault /
checking
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