摘要
锦屏二级水电站引水隧洞属于深埋特长隧洞,其中2条引水隧洞施工采用敞开式硬岩掘进机(TBM)进行施工。引水隧洞TBM开挖直径12.4 m,位列世界第二。引水隧洞穿越区域水文地质条件复杂,开挖中面临地下水预报及处理、通风、岩爆防治等三大关键技术问题。通过对大量文献资料和工程实例的研究,概述TBM近半个世纪的发展及其在隧道建设中的应用现状和主要问题。对锦屏二级水电站区域地质条件以及主要的工程地质问题进行分析,结合国内外已有的TBM施工经验,对锦屏二级TBM选型以及在施工中面临的超前地质预报、围岩稳定、高地应力及岩爆、突涌水、溶洞、有害气体、断层破碎带等不良地质条件所采用的施工方法进行分析研究,针对性地提出在各种不良地质条件的下的TBM施工对策,对锦屏二级水电站TBM施工提出建议,研究成果可供类似工程参考。
Jinping II Hydropower Station is characterisized by the four diversion tunnels which are very long and deep-buried. Two of the tunnels are excavated with open-type hard rock tunnel boring machine（TBM） which has an excavation diameter of 12.4 m, the 2nd largest of the same type in the world. The hydrogeological conditions at the tunnel site are very complicated. Three key problems might be met during tunneling, including the forecast and treatment of the groundwater, the ventilation, and the prevention of rockburst. Based on the study of a large amount of data and project case studies of the TBM development, the development of TBM over the past 50 years, its use in tunneling and the encountered problems, are summarized. Based on the research and analysis of the regional geological conditions, main engineering geological problems, and TBM construction experiences at home and abroad, the TBM type selection and tunneling method in case of rock unstability, high geostress and rockburst, water gushing, karstcavity, harmful gas, fracturalzones, etc., are studied. Construction strategies are suggested for TBM tunneling in Jinping II Hydropower Station in case of different unfavourable geological conditions; which hopefully would also benefit similar future projects.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第10期2000-2009,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点项目雅砻江水电开发联合基金项目(50639090)
关键词
水利工程
锦屏二级水电站
引水隧洞
施工
隧洞掘进机
hydraulic engineering
Jinping II Hydropower Station： diversion tunnel
construction
tunnel boring machine（TBM）
