硬岩巷道掘进的中深孔爆破试验研究

Middle-Deep Bore Blasting Experimental Study on Hard Rock Tunnel Heading

根据硬岩巷道掘进的具体特点,介绍了目前常用的中深孔爆破的掏槽方式,以及选择掏槽形式时应综合考虑的原则,利用爆炸作用理论对掏槽爆破的炮眼间距和装药量进行计算,在现场进行了4种形式的直眼四角菱形掏槽试验,并对该种掏槽方式的爆破效果、施工管理及有关技术问题作了较为细致的分析探讨。

According to the specific features of hard rock tunnel heading, this paper introduces the present frequently-used middle-deep blasting undermining methods and the combined principles when choosing undermining types. By using of explosion effect theories, the paper calculates the bore distance and the charge of undermining blasting. Furthermore, this paper makes tests of four-type direct four corner undermining and analyzes in detail the blasting effects, construction managements and the corresponding technique of this undermining type.