Dynamic Secondary Borehole-Sealing Method for Gas Drainage Boreholes along the Coal Seam
作者： Wei Qin , Jialin Xu
DOI: 10.1155/2018/1723019
关键词: Borehole 、 Gas concentration 、 Slurry 、 Cement mortar 、 Drainage 、 Geology 、 Current (stream) 、 Coal mining 、 Mining engineering 、 Abutment
摘要: Under the influence of advanced abutment pressure, tightness a borehole is destroyed, so secondary sealing needed; however, opportune time for unclear. In addition, current borehole-sealing devices do not have functionality. this paper, an opportunity election model was established, and dynamic device developed. working face 3908 Kaiyuan Coal Mine, in situ test conducted. The results show that boreholes sealed with high-water-expansion slurry obviously better than cement mortar polyurethane. When destroyed by peak measures can significantly improve suction gas concentration, drainage amount pressure loading stage.
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