软弱围岩隧道大断面开挖周边孔爆破新技术

New Peripheral Hole Blasting Techniques for the Large-section Excavation of the Soft Wall-rock Tunnel

分析了软弱围岩隧道采用大断面开挖的可行性,介绍了周边孔拱部光面爆破、边墙预裂爆破的新技术,为类似条件下的隧道开挖提供一些可行经验。

This paper analyzes the feasibility of adopting the large-section excavation in soft wall rock tunnel, introduces the new techniques of the smooth blasting on the arch part of peripheral hole and the side-wall presplitting blasting, which provide some practicable experiences for the tunnel excavation under similar conditions.