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北疆供水二期工程中的西二、喀—双、双—三隧洞总长516.19 km,设计采用18台TBM分段掘进,其中喀—双隧洞单洞长283.27 km,是目前世界在建最长的输水隧洞。深埋、超特长、TBM集群施工是该隧洞工程建设的显著特点,结合区域地质构造特征、工程地质条件和大量地质勘探成果,分析了存在的主要工程地质问题,提出了TBM结合钻爆法联合分段掘进的施工组织方案。并围绕深埋隧洞施工支洞及TBM进入通道型式的选择布局、超特长隧洞分段施工及TBM掘进方案优化设计、TBM集群施工及配套系统高效运行管理、地质灾害预测预报及风险防范控制、软岩变形控制及断裂破碎带安全掘进等工程建设中的重点、难点及关键技术问题,开展了分析讨论。可供TBM设计制造和长隧洞工程建设借鉴参考。
In the second phase of the Northern Water Supply Project, the total length of the second, the second, the second and the third tunnels is 516.19 km. 18 TBM sections are designed for tunneling. The single tunnel of the double-tunnel is 283.27 km in length, Water Tunnel. TBM cluster construction is a significant feature of the tunnel construction. Combined with the regional geological structural features, engineering geological conditions and a large number of geological exploration results, the main engineering geological problems are analyzed. The TBM combined with drilling and blasting method is proposed Segmentation of the tunnel construction program. The paper also focuses on the selection layout of construction tunnels and TBM access tunnels, the construction of super-long tunnel and TBM tunneling project, the efficient operation and management of TBM cluster construction and ancillary systems, the prediction and prevention of geological hazards and risk prevention and control, Rock deformation control and fracture broken belt safety excavation and other key construction projects, difficulties and key technical issues, carried out analysis and discussion. For TBM design and construction and long tunnel construction reference for reference.