深部突出煤层采动断裂带发育高度确定研究

郭明功; 陶云奇; 张剑钊

doi:10.13272/j.issn.1671-251x.2022030039

深部突出煤层采动断裂带发育高度确定研究

doi: 10.13272/j.issn.1671-251x.2022030039

郭明功^1,,
陶云奇^{2, 4},
张剑钊^{3, 4}

1.
平顶山天安煤业股份有限公司八矿, 河南平顶山　467000
2.
河南工程学院资源与安全工程学院, 河南郑州　451191
3.
郑州慧矿智能科技有限公司, 河南郑州　450016
4.
河南理工大学能源科学与工程学院, 河南焦作　454003

基金项目: 河南工程学院博士培育基金资助项目（DKJ2019002）。

详细信息

作者简介:
郭明功（1980—），男，河南方城人，高级工程师，主要从事矿井瓦斯灾害防治方面的研究工作，E-mail：gmg666@163.com

中图分类号: TD712
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出版历程
- 收稿日期: 2022-03-09
- 修回日期: 2022-08-05
- 网络出版日期: 2022-06-07

Study on determination of development height of mining-induced fissure zone in deep outburst coal seam

GUO Minggong^1
,,
TAO Yunqi^{2, 4},
ZHANG Jianzhao^{3, 4}

1.
No.8 Coal Mine of Pingdingshan Tian'an Coal Mining Co., Ltd., Pingdingshan 467000, China
2.
School of Resources and Safety Engineering, Henan University of Engineering, Zhengzhou 451191, China
3.
Zhengzhou Huikuang Intelligent Technology Co., Ltd., Zhengzhou 450016, China
4.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

摘要

摘要: 采用高位定向长钻孔抽采瓦斯技术代替高抽巷抽采采动卸压瓦斯不仅能够大幅缩减岩石巷道掘进量，有效缓解矿井采掘接替紧张局面，而且瓦斯治理效果显著，但高位定向长钻孔抽采瓦斯技术在实际应用中经常会出现因采动覆岩“三带”发育高度范围确定失准，定向长钻孔布置层位过高或过低导致应用效果不佳的问题。针对该问题，以河南平顶山天安煤业股份有限公司八矿己₁₅−15050工作面为研究背景，采用经验公式法和数值模拟实验法确定该工作面煤层采动断裂带发育高度，得到了垮落带最大发育高度为13.2 m，断裂带最大发育高度为48 m。利用千米定向钻机在己₁₅−15050工作面施工高位定向长钻孔对所得的断裂带发育高度进行验证，结果表明：距煤层顶板20 m处上覆岩层岩性较为破碎，断裂带高浓度瓦斯区在距顶板23 m以上；当己₁₅−15050工作面推进至105 m时，高位定向长钻孔与采空区断裂带已充分沟通；己₁₅−15050工作面上隅角及回风流瓦斯均保持在0.47%，且高位定向长钻孔单孔最大瓦斯抽采体积分数达13.2%，日抽采纯量保持在3~4 m³/min，配风量按2 500 m³/min计算，高位定向长钻孔抽采瓦斯量可达风排瓦斯量的25.5%~34.0%，期间未出现瓦斯超限，高位定向长钻孔布置在当前层位内能够成功治理上隅角和回风流瓦斯，验证了综合2种方法确定断裂带发育高度的正确性。
- 深部突出煤层 /
- 瓦斯抽采 /
- 高位定向长钻孔 /
- 垮落带 /
- 断裂带 /
- 发育高度 /
- 上隅角
Abstract: The use of high-level directional long borehole gas extraction technology instead of high-level extraction roadway to extract mining pressure relief gas can greatly reduce the amount of rock roadway excavation. And it can effectively relieve the tension situation of mine mining replacement. Moreover, it can achieve remarkable gas control effect. But the high-level directional long borehole gas extraction technology often has problems in practical application. Due to inaccurate determination of the development height range of the upper "three zones" of mining overburden, the directional long borehole layout horizon is too high or too low. The application effect is poor. In order to solve this problem, taking the VI₁₅-15050 working face of No. 8 Coal Mine of Henan Pingdingshan Tian'an Coal Mining Co., Ltd. as the research background, the development height of mining-induced fissure zone in the coal seam of the working face is determined by using empirical formula method and numerical simulation experiment method. The maximum development height of the caving zone is 13.2 m, and the maximum development height of the fissure zone is 48 m. The kilometer directional drilling rig is used to construct high-level directional long borehole in the VI₁₅-15050 working face, and the fissure zone development height is verified. The results show that the lithology of overburden is relatively broken at 20 m from the roof of the coal seam, and the high concentration gas area in the fissure zone is more than 23 m from the roof. When the VI₁₅-15050 working face is pushed to 105 m, the high-level directional long borehole and the fissure zone in the goaf have been fully communicated. The gas in the upper corner and return air flow of the VI₁₅-15050 working face is kept at 0.47%. The maximum gas extraction volume fraction of a single hole of the high-level directional long borehole is 13.2%. The daily net gas extraction volume is kept at 3-4 m³/min, and the air distribution volume is calculated as 2500 m³/min. The gas extraction volume of high-level directional long boreholes can reach 25.5%-34.0% of the air exhaust gas volume. During this period, there is no gas overrun, and the high-level directional long boreholes arranged in the current layer can successfully control the gas in the upper corner and return air flow. The correctness of the development height of the fissure zone obtained by the two methods is verified.
- deep outburst coal seam /
- gas extraction /
- high-level directional long borehole /
- caving zone /
- fissure zone /
- development height /
- upper corner

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图 1 煤层综合柱状图

Figure 1. Coal seam comprehensive histogram

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图 2 己₁₅−15050工作面巷道布置

Figure 2. Layout of VI₁₅-15050 working face roadway

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图 3 UDEC数值模型

Figure 3. UDEC numerical model

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图 4 模拟煤层开挖数值模拟实验结果

Figure 4. Numerical simulation experiment results of simulated coal seam excavation

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图 5 高位定向长钻孔布置

Figure 5. Layout of high-level directional long borehole

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图 6 高位定向长钻孔瓦斯抽采体积分数对比

Figure 6. Comparison of gas extraction volume fraction of high-level diretional long borehole

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图 7 高位定向长钻孔抽采混量对比

Figure 7. Comparison of extraction and production mixing volume of high-level diretional long borehole

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图 8 上隅角瓦斯体积分数变化曲线

Figure 8. Change curve of gas volume fraction in upper corner

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图 9 回风流瓦斯体积分数变化曲线

Figure 9. Change curve of gas volume fraction in return air flow

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表 1 煤层顶板岩石力学参数测试结果

Table 1. Test results of mechanical parameters of coal seam roof and rock stratum

岩石名称	弹性模量/GPa	抗压强度/MPa	抗压强度平均值/MPa	抗拉强度/MPa	抗拉强度平均值/MPa
泥岩	11.0	21.5～27.6	23.3	0.9～1.4	1.05
砂质泥岩	18.5	29.6～47.4	35.3	1.5～4.8	3.1
细粒砂岩	28.3	38.3～72.6	54.0	3.2～7.6	6.1
中粒砂岩	33.6	21.8～85.4	48.5	1.4～6.3	3.3
粗粒砂岩	23.1	21.8～58.9	32.7	2.3～3.3	2.8

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表 2 高位定向长钻孔设计参数

Table 2. Design parameters of high-level directional long borehole

孔号	孔深/m	下筛管深度/m	钻孔终孔距煤层垂距/m	钻孔终孔距风巷平距/m
1号	522	522	16	15
2号	525	525	21	25
3号	527	527	25	35
4号	522	522	29	45
5号	513	513	33	55
6号	501	501	38	65

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