深孔预裂爆破技术在石方开挖施工中的应用

西安市黑河枢纽工程，导流洞出口高边坡坡比为1：0．5，长达17.00m的开挖坡面，利用LM－500C钻机钻孔，实施预裂爆破技术施工，能否达到坡面欠控为0，超挖小于20cm的设计要求。通过认真进行爆破设计，精心进行爆破施工，取得了良好的爆破效果。

Application of deep hole presplit blasting technology in rock excavation

For Jinpen Reservoir on the Heihe River supplying water to the Xi'an metropolis, theproblem in construction is that the steep slope should be excavated from the outlet of diversiontunnel to the elevation of 538, with the length of 17. 00 m and the slope of 1: 0. 5. The hole isdrilled by LM-500C drilling machine, the excavation is realized by presplit blasting, in order tomake the excavation meet the design requirements which are zero underexcavation and overexca-vation less than 20 cm. The problem is solved by taking seriously in design and elaborately imple-ment of pre-blasting. The result of excavation is satisfactory.