The large upper and lower wedge-shaped undercut holes arrangement in the centre of the heading face is recommended based on the comparison and analysis of different undercut holes arrangements in excavation of the Xiganchi water conveyance tunnel located in weak and soft surrounding rocks using smooth blasting technology.
分析光面爆破技术在西甘池输水隧洞软弱围岩开挖中的掏槽孔方案比较,采用在掌子面中心布置上下楔形大掏槽的方案。