摘要
锦屏二级水电站布置7条穿越锦屏山的隧洞群总长约120 km,其中4条引水隧洞单洞均长16.67 km,开挖洞径12.4~14.6 m,隧洞沿线一般埋深1 500~2 000 m,最大埋深2 525 m,最高外水压力超过10 MPa,具有洞线长、埋深大和洞径大等特点,是国内乃至世界上已建、在建总体规模最大、综合难度最高的地下洞室群工程。引水隧洞沿线水文地质条件复杂,地形条件特殊,在建设过程中遭遇高地应力岩爆、岩溶地下突涌水和承载结构等诸多难题挑战,围绕上述难题开展了大量的开创性研究工作,成功解决了深埋特大水工隧洞关键技术问题,保证了隧洞的安全快速掘进和稳定运行,电站于2014年全部投产发电,工程处于安全稳定运行状态。
Seven tunnels across Jinping Mountain are arranged for JinpingⅡHydropower Station,with a total length of about 120 km.Among them,four headrace tunnels have a length of 16.67 km,an excavated diameter of 12.4-14.6m,and a cover depth of 1 500-2 000 m in general.The maximum cover depth is 2 525 m,and the maximum external water pressure is more than 10 MPa.The tunnels are featured by great length,great depth and large diameter.It is the largest and most difficult among the underground tunnel groups built or under construction in China and even the world.With complex hydrogeological conditions and special topographical conditions along the tunnels,many challenging problems,such as rock burst under high in situ stresses,groundwater inrush in karst strata and failure of loading bearing structure,were encountered during construction.A great amount of groundbreaking studies were carried out regarding these problems.The key technical problems during construction of extremely large and deep tunnels were solved successfully.Safe and rapid tunnel construction and stable operation were achieved.The hydropower station started operation in 2014 and has been in a safe and stable operation state.The successful construction of headrace tunnels of JinpingⅡHydropower Station can provide some experiences and reference for deep tunnel projects in the world.
出处
《隧道建设（中英文）》
北大核心
2017年第11期1492-1501,共10页
Tunnel Construction
关键词
锦屏二级水电站
引水隧洞
深埋
高地应力
特大隧洞
Jinping Ⅱ Hydropower Station
headrace tunnel
deep-buried tunnel
high in situ stress
extremely-large tunnel
