Application of deep borehole blasting on fully mechanized hard top-coal pre-splitting and gas extraction in the special thick seam

Liu Jian; Liu Zegong; Xue Junhua; Gao Kui; Zhou Wei

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Application of deep borehole blasting on fully mechanized hard top-coal pre-splitting and gas extraction in the special thick seam

机译：深孔爆破在特厚煤层综采硬顶煤预分瓦斯中的应用

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In order to solve the problems of top-coal inadequate destruction and large amounts of gas emission in mining extra thick and hard coal seam,this study investigated the pre-splitting for deep borehole blasting and gas pre-draining technologies on top coal.The mechanism of the technologies was systematically expounded based on hard top-coal cracks development obtained by numerical simulation and theoretical analysis.The results show that explosive blasting in the hard rock results in a large number of cracks and large displacement in the rock mass due to the effect of explosion stress.Meanwhile,the thick top-coal caves,and desorbing gas flows along the cracks improve gas extraction.Finally,the pre-splitting for deep borehole blasting and gas pre-draining technologies was applied in No.3802 working face of Shui Liandong Coal Mine,which increases monthly output in the face to 67.34 kt and the drained gas concentration to 86.2%.The drained gas average concentration from each borehole reaches 40%,and the effect is remarkable.

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《矿业科学技术（英文版）》 |2015年第5期|755-760|共6页
作者
Liu Jian; Liu Zegong; Xue Junhua; Gao Kui; Zhou Wei;
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作者单位

State Key Laboratory of Deep Coal Mining & Environmental Protection, Huainan 232001, China;

School of Energy and Safety, Anhui University of Science & Technology, Huainan 232001, China;

Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education, Anhui University of Science & Technology, Huainan 232001, China;

School of Energy and Safety, Anhui University of Science & Technology, Huainan 232001, China;

Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education, Anhui University of Science & Technology, Huainan 232001, China;

State Key Laboratory of Deep Coal Mining & Environmental Protection, Huainan 232001, China;

School of Energy and Safety, Anhui University of Science & Technology, Huainan 232001, China;

Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education, Anhui University of Science & Technology, Huainan 232001, China;

State Key Laboratory of Deep Coal Mining & Environmental Protection, Huainan 232001, China;

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入库时间 2022-08-18 01:02:50

Application of deep borehole blasting on fully mechanized hard top-coal pre-splitting and gas extraction in the special thick seam

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