输水隧洞作为长距离跨流域调水工程的关键控制性工程为缓解经济布局与水资源分布之间的区域矛盾发挥着巨大作用。而我国西南高烈度地区地质构造复杂,活动断裂分布密集,导致输水隧洞工程不可避免地需要穿越多条活动断裂带建设。针对滇中引水工程香炉山隧洞过活动断裂带,开展隧道适应性结构在断层错动条件下的影响校核。以龙蟠—乔后断层F10-1为代表,基于隧洞关键部位的位移、相对变形、最大主应力和纵向等效内力等指标,评估活动断层对香炉山隧洞抗错断适应性结构的影响,并基于数值计算验证其在减小衬砌内力与变形方面的作用。结果表明受走滑为主的断层运动影响,隧洞的一侧边墙表现为受拉状态,拉应力较小,约为5 MPa;铰接缝的最大法向变形与切向变形均位于断层带中央节段之间;铰接设计这一适应性结构的存在有效改善了衬砌在错动条件下的受力状态。研究成果可以直接应用于穿越活断层输水隧洞的工程设计与施工,为相关工程隧洞建设提供有利支撑。
Abstract
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.
关键词
输水隧洞 /
活动断裂 /
抗错断设计 /
走滑断层 /
校核
Key words
water conveyance tunnel /
active fault /
anti-dislocation design /
strike slip fault /
checking
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基金
云南省重大科技专项计划项目(202102AF080001);国家自然科学基金资助项目(52079133);中国科学院青年创新促进会项目(2019323)
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