我公司承接的花一级公路上程，路基开挖须穿山而过，总j厂挖量33．7万m’，其中三类上约占20％，次坚石与坚力约占80％。通过工程类比，我们采用潜孔钻机与小型空压机凿岩系统进行爆破施工，取得了较好的经济效益。在选择路基开挖施工方案时，采用小直径炮孔凿岩爆破法，效率较 I took the company to spend a highway on the road, roadbed excavation to go through the mountains, the total plant dredging 337,000 m ’, of which about 20% of the three categories, Kennedy stone and strong about 80%. Through the engineering analogy, we use the DTH drilling rig and small air compressor drilling system blasting construction, and achieved good economic benefits. In the choice of subgrade excavation construction program, the use of small diameter blasthole blasting method, the efficiency of more