超长特大导流洞洞室爆破开挖施工方法

Study on Construction Method of Blasting and Excavation of Extra-long and Super-large Diversion Tunnel

拉哇水电站导流洞工程是国内在建隧洞最长、规模最大、洞径最大的导流洞群工程,如何实现导流洞洞室群快速高质量开挖贯通,对实现2021年导流洞正式过流和大江截流目标至关重要。通过对该电站超长特大导流洞工程施工布置、爆破开挖方法、爆破参数等施工技术应用成果进行归纳、总结,对推动规模集群化、超长特大化、施工条件复杂化等洞室工程施工技术发展和为同类工程提供经验具有重要意义。

The diversion tunnel of Lawa Hydropower Station ranks first in terms of length,scale and diameter among tunnels under construction in China.Rapid excavation of the diversion tunnel group in high quality and earlier breakthrough are of great importance for achieving the goal of formal flow passing of the diversion tunnel and river closure in 2021.This paper summarizes the application results of the blasting excavation technology for extra-long and super-large diversion tunnel,such as the construction layout,blasting excavation method and blasting parameters,which are of great significance in developing construction technology for underground cavern clusters which are super in length,huge in size,and complicated in construction condition,etc.Summarization in this paper is also of great importance in providing references for similar projects.