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马坑铁矿是某地目前已探明的铁矿床之一。勘探工作至1982年止完成钻孔129个，进尺82853米，平均孔深663米，最大孔深1057米。马坑矿区的地层特点是浅部风化带破碎且厚，中部溶洞多裂隙发育，深部矿体厚埋藏深，施工特点是勘探网度密，对孔斜度和取心率要求高，钻探施工难度大。本文就该矿区大口径钻探施工中的主要技术方法作一点分析。一、工程质量要求与存在技术问题1．钻孔弯曲：穿过主矿层底板偏离勘探线不得
Ma Hang iron ore mine is one of the proven iron ore deposits. Exploration work until 1982 completed 129 holes, footage 82,253 meters, the average hole depth of 663 meters, the maximum hole depth of 1057 meters. The features of the Ma Hang mining area are that the shallow weathered zone is crushed and thick, multiple fractures are developed in the central karst cave, and the deep ore body is deeply buried. The construction features are dense exploration network, high requirement on hole slope and coring rate, large drilling difficulty . This article makes a little analysis on the main technical methods in the large-diameter drilling of this mining area. First, the project quality requirements and technical problems 1. Borehole bending: Deviation from exploration line through main floor