组合斜眼掏槽技术在中硬围岩光面爆破中的应用

The Application of the Combination Inclined Underholing Technique in the Smooth Blasting of Hard Wall-rock

在光面爆破中,将楔形掏槽及锥形掏槽技术应用到掏槽眼、辅助眼所组成的“大掏槽体系”中,最终形成了由核心加强抛掷掏槽和外围近锥形辅助掏槽组成的组合斜眼掏槽设计,在铁路隧道中硬围岩施工中得到了广泛的应用,并取得了较好的效果。

In the smooth blasting, the wedge-type underholing technique and the core-type underholing technique are used in the ＂big underholing system＂ composed of the cutting hole and auxiliary hole, and finally the combination inclined underholing design composed of the kernel reinforced fight underholing and the peripheral near-core auxiliary underholing forms, which is widely used in the middle hard wall-rock construction of the railway tunnels.