隧道周边孔切缝药包水间隔装药聚能爆破试验
Test of Shaped Charge Blasting with Slit Cartridge Water Interval Charge in Tunnel Peripheral Hole
张丕云 1王云东 1夏通买 1李兴全 1甘会莲 1陶家龙 2王建国2
作者信息
- 1. 云南交投公路建设第六工程有限公司
- 2. 昆明理工大学国土资源工程学院
- 折叠
摘要
勐省隧道Ⅳ级围岩掘进采用孔底连续装药爆破开挖,存在明显的超欠挖现象.为保证一次爆破成型,减少爆破对围岩和支护结构的扰动,在勐省隧道周边孔应用切缝药包水间隔装药聚能爆破技术,并开展现场试验.试验结果表明,相较于传统光面爆破,水间隔装药聚能爆破技术不仅有效控制了超欠挖,形成了平整轮廓线,且周边孔单孔药量降低了25%,孔距增加了100～300 mm,周边孔半孔率大于70%,节约了混凝土初喷量,避免了欠挖补炮,降低了对围岩的频繁爆破扰动.
Abstract
The excavation of Grade IV surrounding rock of Mengsheng Tunnel is carried out by contin-uous charging blasting at the bottom of the hole,which has obvious over-excavation and under-excavation phenomenon.In order to ensure one-time blasting forming and reduce the disturbance of blasting to sur-rounding rock and supporting structure,the slit cartridge water interval charging technology is applied in the peripheral holes of Mengzhou tunnel,and field tests are carried out.The test results show that compared with the traditional smooth blasting,the water interval charge shaped blasting technology not only effectively controls the overcut and undercut excavation,but also forms a flat contour line,and the charge amount of the single hole in the peripheral hole is reduced by 25%,the hole distance is increased by 100～300 mm,and the half-hole rate of the peripheral hole is greater than 70%,which saves the initial spray amount of concrete and avoids the undercut shot.The frequent blasting disturbance to surrounding rock is reduced.
关键词
隧道掘进/水间隔装药/聚能爆破/切缝药包Key words
tunnel excavation/water interval charge/shaped charge blasting/slit cartridge引用本文复制引用
出版年
2024
NETL
NSTL
万方数据