凡口铅锌矿多空孔筒形掏槽分段爆破成天井技术

摘要

The volume of the raising project in mines is generally accounted for 20% ~25% of the total excavation. The raise excavating is one of the most difficult parts. It is necessary to form the slot raise of 16 m high and 2 m diameter in the tunnel of the stope in Fankou Lead-zinc Mine, in order to transport the excavated ores of the stopes quickly and improve the ventilation conditions. The technology of segment cut blasting with empty long holes for raise driving is practiced in the Fankou Lead-zinc Mine, and the satisfied results are achieved, it can be referred by the similar projects.%矿山天井掘进工程量一般占矿山掘进总量的20%~25%,天井施工作业是当前掘进工作中最困难的一环凡口铅锌矿为缓解出矿压力、改善通风条件,需要在采场预控顶巷道一次爆破形成高16m、直径2m的切割天井采用大直径多空孔掏槽爆破一次成井技术进行实践,爆破及成井效果较好,可供类似工程参考.