Technology and application of dynamic pressure gas secondary drainage through borehole in bottom drainage roadway of high gas outburst coal seam

LI Yanhe; ZHAI Cheng; DING Xiong

Safety in Coal Mines > 2022 > 53(10): 191-196.

LI Yanhe, ZHAI Cheng, DING Xiong. Technology and application of dynamic pressure gas secondary drainage through borehole in bottom drainage roadway of high gas outburst coal seam[J]. Safety in Coal Mines, 2022, 53(10): 191-196.

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Technology and application of dynamic pressure gas secondary drainage through borehole in bottom drainage roadway of high gas outburst coal seam

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Published Date: October 19, 2022

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In order to solve the problem of gas overrun and low utilization rate caused by mining pressure relief gas pouring into mining working space in high gas outburst coal seam, this paper used numerical simulation and field application methods to study the efficient extraction of coal gas in front of the working face under the influence of dynamic pressure. The results show that according to the gas concentration monitoring data on site, the coal body in front of the working area was divided into high efficiency extraction zone, effective extraction zone and original extraction zone. The efficient extraction zone was within 20 m in front of the working face, with an average gas extraction concentration of 30% or more. Gas extraction in the effective extraction zone was affected by the dynamic pressure, and the extraction concentration decreased fluctuatingly with increasing distance from the working face. The range of the original extraction area is 50-60 m away, and the gas concentration of the borehole was stable below 10%, which was less influenced by the mining movement. The second extraction technology of dynamic pressure gas in the floor gas extraction roadway of high gas outburst coal seam through the crossing boreholes was better applied in the middle extraction roadway of 12110 working face, the number of extraction holes in the dynamic pressure area was 5%-10% of that in the non-dynamic pressure area, but the monthly extraction volume could reach up to 74.01% of the monthly extraction volume inthe non-dynamic pressure area.
- gas extraction in dynamic pressure zone,
- mining face,
- crossing borehole,
- stress distribution,
- pressure-relief gas,
- numerical simulation

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[1]	谢和平．深部岩体力学与开采理论研究进展[J]．煤炭学报，2019，44（5）：1283－1305. XIE Heping. Research review of the state key research development program of China: Deep rock mechanics and mining theory[J]. Journal of China Coal Society, 2019,44（5）: 1283-1305.
[2]	袁亮．深部采动响应与灾害防控研究进展[J]．煤炭学报，2021，46（3）：716－725. YUAN Liang. Research progress of mining response and disaster prevention and control in deep coal mines[J]. Journal of China Coal Society, 2021, 46（3）: 716-725.
[3]	秦伟，许家林，彭小亚．本煤层超前卸压瓦斯抽采的固－气耦合试验[J]．中国矿业大学学报，2012，41（6）：900－905. QIN Wei, XU Jialin, PENG Xiaoya. Experimental study of coupling between solid and gas during drainage by advance pressure relief in mining-coal seam[J]. Journal of China University of Mining & Technology, 2012, 41（6）: 900-905.
[4]	尹光志，李文璞，李铭辉，等．不同加卸载条件下含瓦斯煤力学特性试验研究[J]．岩石力学与工程学报，2013，32（5）：891－901. YIN Guangzhi, LI Wenpu, LI Minghui, et al. Experimental study of mechanical properties of coal containing methane under different loading-unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32（5）： 891-901.
[5]	周宏伟，荣腾龙，牟瑞勇，等．动应力下煤体渗透率模型构建及研究进展[J]．煤炭学报，2019，44（1）：221. ZHOU Hongwei, RONG Tenglong, MOU Ruiyong, et al. Development in modeling approaches to mining-induced permeability of coals[J]. Journal of China Coal Society, 2019, 44（1）: 221-235.
[6]	LIU Q, CHENG Y, DONG J, et al. Non-Darcy Flow in Hydraulic Flushing Hole Enlargement-Enhanced Gas Drainage: Does It Really Matter[J]. Geofluids, 2018: 1.
[7]	林柏泉，周世宁，张仁贵．煤巷卸压带及其在煤与瓦斯突出危险性预测中的应用[J]．中国矿业大学学报，1993，22（4）：44－52. LIN Baiquan, ZHOU Shining, ZHANG Rengui. The stress relaxation zone in coal tunneling and its application to forecast of outburst danger[J]. Journal of China University of Mining & Technology, 1993, 22（4）: 44-52.
[8]	林柏泉，周世宁．煤巷卸压槽及其防突作用机理的初步研究[J]．岩土工程学报，1995（3）：32－38. LIN Boquan, ZHOU Shining. Outburst preventive mechanism of stress relaxation groove in coal tunnel[J]. Chinese Journal of Geotechnical Engineering, 1995（3）: 32.
[9]	齐黎明，林柏泉，支晓伟．上山掘进时卸压区应力及防突长度分析[J]．中国矿业大学学报，2005，34（3）：299. QI Liming, LIN Baiquan, ZHl Xiaowei. Analysis on distressed zone’s stress and length of preventing outburst in raising tunnelling[J]. Journal of China University of Mining & Technology, 2005, 34（3）: 299-302.
[10]	张建国，林柏泉，叶青．工作面卸压区浅孔瓦斯抽放技术研究[J]．采矿与安全工程学报，2006，23（4）：432－436. ZHANG Jianguo, LIN Baiquan, YE Qin. Research on technology of draining methane of shallow boreholes in a stress-relaxation area of working face[J]. Journal of Mining & Safety Engineering, 2006, 23（4）: 432-436.
[11]	吴仁伦，王继林，程辉，等．五阳煤矿本煤层瓦斯超前采动卸压抽采试验[J]．煤矿安全，2017，48（2）：13. WU Renlun, WANG Jilin, CHENG Hui, et al. Experimental study on pressure relief and extraction of gas in advancement of Wuyang Coal Mine[J]. Safety in Coal Mines, 2017, 48（2）: 13-16.
[12]	吴仁伦，王亚飞，徐东亮，等．工作面面宽对煤层群开采瓦斯卸压运移“三带”范围的影响[J]．采矿与安全工程学报，2017，34（1）：192－198. WU Renlun, WANG Yafei, XU Dongliang, et al. Effects of working face width on the scope of the “three zones” of gas pressure relief and migration in coal seam group mining[J]． Journal of Mining & Safety Engineering, 2017, 34（1）: 192-198.
[13]	郑吉玉，田坤云．工作面前方煤体卸压区范围及瓦斯抽采应用[J]．煤矿安全，2016，47（6）：140－143. ZHENG Jiyu, TIAN Kunyun. Coal pressure relief zone and gas extraction application ahead of working face[J]. Safety in Coal Mines, 2016, 47（6）: 140-143.
[14]	许江，苏小鹏，彭守建，等．卸压区不同钻孔长度抽采条件下瓦斯运移特性试验[J]．岩土力学，2018，39（1）：103－111. XU Jiang, SU Xiaopeng, PENG Shoujian, et al. Experiment on gas migration characteristics during coal bed methane exploitation under different lengths of drilling hole in distressed zone[J]. Rock and Soil Mechanics, 2018, 39（1）: 103-111.
[15]	CHEN Y, XU J, CHU T, et al. The evolution of parameters during CBM drainage in different regions[J]． Transport in Porous Media, 2017, 120（113）: 1-18.

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[10]	HUN Baoju, HAN Libing. Stress Strain Laws for Coal Body Around Through Beds Borehole Orifice in Outburst Coal Seam[J]. Safety in Coal Mines, 2014, 45(1): 143-146.

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