我队所鑽探地层的特征是当鑽孔鑽进到矿层时,由于鑽具的廻轉、冲击以及冲洗液的冲洗作用,易自行破碎。这样每当回次进尺終了采取岩心时,卡塞物不能下落到矿心較下部的間隙內,多被破碎矿心块阻留在矿心的頂部,因而使矿心采取率常常低于地質設計要求。为此,我們采用了于鑽采取岩心的方法,效果良好,矿心采取率达到90％以上。 The characteristic of the formations drilled by our team is that when the borehole is drilled to the mine bed, it is easy to break itself due to the turning, impacting and washing of the drilling fluid. So every time the footage is taken back to take the core, the jam can not fall to the lower part of the gap between the core, more broken ore block stuck in the top of the core, so the core mining rate is often lower than the geological design Claim. For this reason, we adopted a method of taking a core while drilling, and the effect was good. The mining center adopted a rate of over 90%.