某电站引水隧洞施工方案研究与应用

引水隧洞是水利水电工程中的重要建筑物,施工技术复杂,施工难度大。为制定一个先进、成熟、经济、适用、可靠的施工方案,需要对不同施工方案进行全面比选。结合某电站引水隧洞工程实例系统研究了其施工方案,基于该工程特点,从施工质量、工期、环境保护、工程投资等方面对比分析了钻爆法、TBM法、钻爆法+TBM法的优缺点。结果表明:采用钻爆法施工更为合理;确定了平洞段施工采用分层钻爆开挖,斜井段采用导井开挖,在复杂特殊地质段采用中空自进式锚杆支护;并制定了具体施工方法。钻爆法方案在实际应用中有效保证了工程质量和进度,以期为今后类似引水隧洞施工提供借鉴和参考。

Application of Construction Schemes for Water Diversion Tunnel of Hydropower Station

Water diversion tunnel is an important building in water resources and hydropower engineering.Its construction technology is complex and difficult,thus it is essential to carry out a compare and selection to make an advanced,mature,economical,applicable and reliable construction scheme.Taking the diversion tunnel project of a hydropower station as an example,the construction scheme of the project was studied systematically in this paper.From the aspects of construction quality,construction period,environmental protection,project investment and so on,the advantages and disadvantages of drilling and blasting method,TBM method,drilling and blasting method + TBM method were analyzed according to the engineering characteristics.The results showed that the drilling and blasting method is more reasonable.The adit of diversion tunnel can be excavated by stratified drilling and blasting,the deviated interval section inverse well drill excavated of pilot shaft,complex special geological section adopted self-drilling hollow grouting anchor,and developed a construction procedure.In practical application this scheme can effectively ensure the quality and the progress of the project,the research is expected to provide a reference for similar diversion tunnel construction in the future.