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陕西省汉中天台山矿区地层复杂,岩石软硬相间,裂隙发育,构造以线状褶皱伴以走向断裂为特征,总体走向北东60°,岩矿层倾角一般为80°左右。区内主要岩矿层有石英岩、炭质千枚岩、磷矿层、含锰白云岩、白云岩、大理岩、结晶灰岩、绢英片岩、片理化闪长岩等。矿区钻孔设计均为斜孔,轴夹角一般为20°左右;钻孔倾角要求分段上漂,每百 m 最小4°,最大8—12°;设计方位一般为330°或150°。在孔深300m 内,钻孔极易跑方位和倾角,常因此报废工作量,给施工带来极大困难。为解决这一技术难题,除采取一般防斜治斜措施外,设计了“孔底重力纠斜器”(以下简称纠斜器)。经1984年在该矿区的9个钻孔中,实际
The Tiantaishan mining area in Hanzhong, Shaanxi Province has a complex formation with soft and hard rocks and fractures. The structure is characterized by linear folds and strike-to-strike faults, with an overall strike angle of 60 ° to the east and a rock dip of about 80 °. The main rock strata in the area are quartzite, carbonaceous phyllite, phosphate rock, manganese-bearing dolomite, dolomite, marble, crystalline limestone, sericite schist, and physicochemical diorite. Borehole design are inclined holes, the angle between the shaft is generally about 20 °; drilling inclination required sub-floating, minimum 4 ° per hundred m, maximum 8-12 °; design orientation is generally 330 ° or 150 °. In the hole depth of 300m, drilling easy to run azimuth and inclination, often scrapped the workload, to bring great difficulties to the construction. In order to solve this technical problem, in addition to the general anti-tilt-tilt control measures, the design of the “hole bottom gravity correction device” (hereinafter referred to as correction device). Nine holes drilled in the mine in 1984, actually