瀑布沟水电站尾水隧洞开挖技术总结

Technical Summary on Tailrace Tunnel Excavation at Pubugou Hydropower Station

瀑布沟水电站尾水隧洞为特大断面,开挖施工中制定了科学、合理的开挖程序,并通过爆破试验确定了每一种围岩类别的爆破参数,同时,通过原型观测仪器反馈爆破参数是否合理,并在实践中不断优化调整,以期达到最理想的效果。在岩脉及断层等不良地质段,通过超前支护和加固处理两种措施,在尾水洞施工中,对保证洞室和施工安全发挥了很好的效能。

Tailrace tunnel at Pubugou hydropower station has extra large cross section.Scientific and proper excavation procedure is decided during construction and blasting parameters are determined for each kind of surrounding rock based on blasting test results.Meanwhile,the blasting parameters are fed back by prototype observation instruments to know whether they are reasonable.These parameters should be optimized and adjusted in practice to achieve best results.Advanced support and reinforcement are carried out in rock dykes and faults.In tailrace tunnel construction,these treatment measures gain good results in ensuring safety of tunnel construction.