公路隧道通风竖井硬岩爆破技术

Hard Rock Blasting Technique of Ventilation Shaft of Highway Tunnel

秦岭隧道2号竖井地层岩性主要为坚硬混合片麻岩,施工难度大。通过对钻眼机具、掏槽形式、爆破参数和起爆方式进行分析研究和工程实践,确定了合适的竖井硬岩爆破技术,取得了良好的爆破效果,加快了施工速度。

The lithology of No.2 ventilation shaft of Qinling highway the construction difficult. Through analyzing and researching the drill equ and blasting initiation, the hard rock blasting technology fitting to venti blasting effect and advance the construction tunnel is hard mixed gneiss, which makes pment, cut hole styles, blasting parameters ation shaft is determined, which has good