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一、地层及施工概况焦作寺岭矿区有两层高铝粘土矿，每一矿层上部岩层的情况分别是：石英砂岩，它局部为粘土质胶结，岩石破碎，裂隙发育，可钻性达九级；燧石灰岩，含泥质生物碎屑结构，节理发育；粘土岩，极易吸水膨胀；粉质粘土砂岩，会在钻进中产生大量岩粉；尤其是第二矿层较厚，上部岩层极不稳定，施工中经常发生缩径挤钻、砂多埋钻，在提钻过程中常由于处理掉块卡钻事故而甩掉岩心，或下钻扫掉块，掉块落于矿层上而又难于被套入岩心管，堵在钻头部位，扫掉块过程中磨掉矿心，严重影响采心率。
First, the formation and construction profile Jiaozuo Si Ling mining area has two layers of high-aluminum clay mine, the upper rock formations in each case are: quartz sandstone, which is part of the clay cement, broken rock, crack development, drillability of nine ; Flint limestone, muddy biological debris structure, joint development; clay rock, extremely easy to water swelling; silty clay sandstone, will produce a large number of rock in drilling; especially the second ore thick, the very rock layer is not Stabilization often occurs during the construction of small diameter drilling, burial buried sand, often in the process of drilling due to deal with block stuck drill get rid of the core, or under the drill swept blocks, falling blocks on the mine and difficult to be quilt Into the core tube, blocking the drill site, swept off the process of grinding off the heart, seriously affecting mining heart rate.