黑旺铁矿为凹陷露天矿。矿坑西帮2号3米卷扬机斜坡路延深时,由于下车场对邻近边坡要求严格,设计采用预裂爆破控制。限于平台窄,KQ-150型潜孔钻机只好平行于最终坡顶线布置,穿凿垂直深孔作为预裂孔,但经改进装药结构后,取得了满意的效果。 (一)网孔布置该地段为纯石灰岩,节理较发育。台阶上部2～3m在上台阶爆破时破坏严重。 Black Mong iron ore pit for the open pit. West mine pit No. 2 3 meters hoist slope road extension, due to the next yard on the adjacent slope demanding, the design of pre-cracking blast control. Limited to the narrow platform, KQ-150 DTH drilling rig had to be parallel to the final top-line layout, vertical hole drilled as a pre-cut vertical hole, but the improved charge structure, and achieved satisfactory results. (A) Mesh layout The section is pure limestone, more developed joints. 2 ~ 3m in the upper part of the step is seriously damaged when blasting on the stage.