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在广西大厂矿务局长坡锡矿,我们用深孔分段拉槽一次爆破法掘进了一个垂直切割盲天井。整个天井(高14米、长3.6米、宽2.8米)一次爆成,效果很好,达到了设计要求。井壁平整完好,做到了施工安全、技术可靠,实现了高效低消耗,改善了劳动条件,并使我们对深孔拉槽掘进各种井巷应如何爆破有了新的认识。 (一)地质及掘进技术条件天井高度不能小于14米。矿石自然氧化放热严重,温度高达29～32℃。若用普通法掘
In Guangxi Dachang Mining Bureau slope tin mine, we use a deep-hole sub-slot trenches a blasting of a vertical cutting blinds. The entire patio (14 meters high, 3.6 meters long, 2.8 meters wide) once burst, the effect is very good, to meet the design requirements. The well wall is well-formed, safe and reliable in construction, high in efficiency and low in consumption, improved in working conditions, and enabled us to gain a new understanding of how to blast well shafts in deep-hole trenches. (A) Geology and Tunneling Technical conditions Patio height can not be less than 14 meters. Oxygen natural oxidation exothermic, temperature up to 29 ~ 32 ℃. If common law dig