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我分队所钻的钻孔差不多从开孔到终孔都是用双层双动岩心管钻进，如用普通的单层岩心管钻进平均岩心采取率只达19％左右，用内管比外管的长度相差50公厘的双层双动岩心管钻进，岩矿心仍然采不出来。我分队所钻的岩石差不多完全都是特别松软或硬（4～6级）而脆的岩石，在双层双动岩心管的内管里所取出的岩矿心几乎全是特别松软的或破碎成小碎块的岩矿心，后来改用内管比外管长80～100公厘左右的普通双层双动岩心管钻进，结果岩矿心采取率达90％以上，甚至100％。
The drilling holes that our unit drills almost all go from the opening to the final hole with the double double-action core pipe. If using ordinary single-layer core pipe to drill into the average core, the average recovery rate is only about 19% Outer tube length difference of 50 mm double double-action core pipe drilling, rock core still can not mining. Rocks that my unit drilled were almost exclusively soft and hard rocks (grades 4-6). The rock cores that were removed from the inner tube of the double-action double-acting core pipe were almost all extremely soft or crushed Into a small fragment of the rock core, and later switched to the inner tube 80 to 100 mm longer than the outer tube of the ordinary double-action double-core drilling, rock core results taken rate of 90%, or even 100%.