矿山大口径钻孔循环钻进技术研究

针对矿山大口径钻孔硬岩钻进存在排渣难、碎岩效率低的问题,研究了大口径反循环钻进技术。分析了建立反循环的基本条件,介绍了引射器式、多层橡胶片式、孔底孔口联合式等3种密封方法及其应用现状,基于孔底孔口联合式密封方法研制了311 mm、580/311 mm 2种规格大直径反循环潜孔锤和配套孔口密封装置。经现场应用表明:该方法可建立、维持反循环通道,排渣效果好,钻进效率高,可推广应用于矿山大口径钻孔施工中。

Research on Reverse Circulation Drilling Technology for Large-diameter Mine Drilling Hole

In view of the problems of hard to discharge residue and low efficiency of rock breaking，the large caliber reverse circulation drilling technology was studied.Basic conditions for the establishment of reverse circulation was analyzed，and 3 kinds of sealing methods including the ejector type，multilayer rubber chip type，and double sealing of hole bottom and entrance，and their application were introduced.Based on the double sealing method of hole bottom and top，2 kinds of large diameter reverse circulation DTH hammers with specifications of 311 mm and 580/311 mm and their supporting devices for entrance sealing were developed.The on-site application showed that this method can establish and maintain reverse circulation channel with good discharge effect and high drilling efficiency.It is worthy to be further popularized to large diameter drilling in mines.