两年来,通过在雷公尖隧道、张滩隧道和大瑶山隧道这三座隧道深孔光面爆破、予裂爆破的试验和大量工程实践,基本上掌握和解决了深孔爆破技术问题:深孔掏槽技术;合理的炮眼布置和起爆顺序;克服炸药卷的深孔管道效应。由于在施工中我们较好地解决了这三个关键问题,从1981年8月22日开始到1982年12月底在上述三座隧道采用瑞典 In the past two years, the deep-hole blasting technology has basically been mastered and solved through the experiments of deep-hole smooth blasting, pre-blasting blasting and a large number of tunnels in the three tunnels of Leigongjian Tunnel, Zhangtan Tunnel and Dayaoshan Tunnel: deep Hole undercutting technology; Reasonable arrangement and initiation sequence of boreholes; Overcoming the deep borehole effect of dynamite coils. As we have solved these three key problems better during construction, we have adopted Sweden from August 22, 1981 to the end of December, 1982 at the above three tunnels