易自燃煤层顺层抽采钻孔封孔参数优化研究

doi:10.16265/j.cnki.issn1003-3033.2019.03.020

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (3): 120-126.doi: 10.16265/j.cnki.issn1003-3033.2019.03.020

易自燃煤层顺层抽采钻孔封孔参数优化研究

祁云^1,2, 齐庆杰^1,2 教授, 吕有厂³, 周新华^1,4 副教授, 迟羽淳^1,2

1 辽宁工程技术大学安全科学与工程学院,辽宁阜新 123000;
2 辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛 125000;
3 炼焦煤资源开发及综合利用国家重点实验室,河南平顶山 467000;
4 辽宁工程技术大学建筑与工程学院,辽宁阜新 123000

收稿日期:2018-11-11 修回日期:2019-01-21 发布日期:2020-11-26
作者简介:祁云 (1988—),男,安徽淮北人,博士研究生,主要研究方向为矿井火灾防治、煤矿瓦斯灾害防治理论及技术。E-mail:1185847870@qq.com。
基金资助:
国家重点研发计划重点专项(2018YFC0807900);国家自然科学基金资助(51274113);辽宁省教育厅科学研究一般资助项目 (L2012124)。

Study on optimization of borehole sealing parameters based on extraction drilling spontaneous combustion control

QI Yun^1,2,QI Qingjie^1,2,LYU Youchang³,ZHOU Xinhua^1,4,CHI Yuchun^1,2

1 College of Safety Science and Engineering, Liaoning Technical University,Fuxin Liaoning 123000 China;
2 Key Laboratory of Mine Thermodynamic disasters and Control of Ministry of Education, Liaoning Technical University, Huludao Liaoning 125000 China;
3 State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, Pingdingshan Henan 467000, China;
4 College of Architecture and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China

Received:2018-11-11 Revised:2019-01-21 Published:2020-11-26

摘要/Abstract

摘要： 针对平煤十矿顺层抽采钻孔封孔不佳导致钻孔自然发火问题,用钻屑法试验研究巷道围岩应力分布特征,深入分析钻孔周围存在的漏气情况及导致钻孔自然发火的条件,并利用Comsol Multiphysics软件,数值模拟不同封孔深度与长度下钻孔周围漏风速度的分布状况,得到最优封孔参数,并探讨其对瓦斯抽采效果的影响。结果显示,距巷道0～7 m为破碎区,8～19 m为塑性区,20～28 m为弹性区;巷道周围破碎区、钻孔周围漏气圈、封孔材料漏风及抽采管路漏风为钻孔漏风区域,为钻孔自然发火提供通风供氧条件。研究表明:当封孔深度为17 m,封孔长度为8 m,最大抽采负压低于30 kPa时为最优封孔条件,既能保证抽采效果又能防止钻孔自然发火;封孔参数优化后单孔瓦斯抽采体积分数达到70%。

关键词: 瓦斯抽采, 自然发火, 顺层钻孔, 封孔参数, 数值模拟

Abstract: To solve the problem of spontaneous combustion of boreholes caused by poor sealing of boreholes in bedding extraction in No.10 Coal Mine of Pingdingshan Coal Mine, the stress distribution characteristics of surrounding rock of roadway were studied by means of drilling cuttings method, the leakage passage around boreholes and the conditions leading to spontaneous combustion of boreholes were analyzed in depth, and distribution of air leakage velocities around boreholes as a function of both sealing depth and sealing condition was simulated by using the Comsol Multiphysics software. Optimum sealing parameters were obtained and their effects on gas extraction were discussed. The results show that 0-7 m away from the roadway is the broken area, 8-19 m is the plastic area, 20-28 m is the elastic area, the broken area around the roadway, the air leakage around the borehole, the air leakage of sealing material and the air leakage of the extraction pipeline are the air leakage ways of the borehole, providing the ventilation and oxygen supply conditions for the spontaneous combustion of the borehole, that when the sealing depth is 17 m, the sealing length is 8 m, the maximum negative extraction is achieved, and when the pressure is less than 30 kPa, it can not only guarantee the effect of drainage but also prevent the spontaneous combustion of boreholes, and that volume fraction of single hole gas drainage reaches 70% after optimization of sealing parameters, which can effectively prevent spontaneous combustion of drainage holes.

Key words: gas extraction, spontaneous combustion, alone coal seam borehole hole sealing parameters, numerical simulation

中图分类号:

X936

祁云, 齐庆杰, 吕有厂, 周新华, 迟羽淳. 易自燃煤层顺层抽采钻孔封孔参数优化研究[J]. 中国安全科学学报, 2019, 29(3): 120-126.

QI Yun,QI Qingjie,LYU Youchang,ZHOU Xinhua,CHI Yuchun. Study on optimization of borehole sealing parameters based on extraction drilling spontaneous combustion control[J]. China Safety Science Journal, 2019, 29(3): 120-126.

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易自燃煤层顺层抽采钻孔封孔参数优化研究

Study on optimization of borehole sealing parameters based on extraction drilling spontaneous combustion control

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