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封孔目的是为了隔离钻孔所穿过的含水层,防止采矿时地表水和地下水沿钻孔流入采区,淹没矿井;防止地下水流入矿体,破坏矿床等. 封孔工作应根据矿区不同矿层的化学成分进行室内试验,以试验为依据来选择不同类型的水泥,使其结石体强度能达到封孔要求. 为了使封孔质量经得起透孔检查,要求在每个钻孔的第一封孔段内多封5～6米.封完后待其凝固(一般停留48～72小时),下钻在多封的部分孔段中透孔,能采取出完整的水泥石芯即认为
The purpose of sealing is to isolate the aquifer through which the borehole passes to prevent surface water and groundwater from flowing along the borehole into the mining area during mining and inundating the mine shaft, preventing groundwater from flowing into the ore body, destroying the ore bed, etc. The sealing work should be based on different ore layers Of the chemical composition of the indoor test, based on the experiment to choose different types of cement, so that the stone body strength can reach the sealing requirements.In order to make the sealing quality can withstand the perforation inspection, requiring the first in each drilling Sealing the hole more than 5 to 6 meters after the seal to be solidified (usually stay 48 to 72 hours), drill down in the hole in the part of the hole, can take a complete cement stone that is