煤层厚度影响下大直径钻孔卸压释能机理
TD324; 煤层厚度变化是影响大直径钻孔卸压效果的重要因素之一.基于等效弹性模量原理建立了大直径钻孔卸压弹性力学模型,以某矿不同工作面为工程背景,研究了不同煤层厚度条件下大直径钻孔卸压煤体应力分布特征和能量释放规律,探讨了煤层厚度影响下大直径钻孔卸压释能机理.研究结果表明:当大直径钻孔卸压参数相同时,薄煤层中原岩应力、钻孔切向应力及其塑性区范围均大于厚煤层;大直径钻孔周边应力峰值随煤层厚度增加呈非线性减小趋势,当煤层厚度由1m增加到9m,应力峰值由 23.2 MPa降低到 20.2 MPa,降低 12.9%;大直径钻孔卸压释能率随着煤层厚度增加呈减小趋势,当煤层厚度由 1m增加到 9m,大直...
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| Published in | 煤炭科学技术 Vol. 52; no. 6; pp. 40 - 50 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
长崎大学工学研究科,日本长崎852-8521%兖矿能源鄂尓多斯能化有限公司,内蒙古鄂尔多斯 017000%长崎大学工学研究科,日本长崎852-8521
2024
山东科技大学能源与矿业工程学院,山东青岛 266590%山东科技大学能源与矿业工程学院,山东青岛 266590 石家庄铁道大学大型结构健康诊断与控制研究所,河北石家庄 050043 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-2336 |
| DOI | 10.12438/cst.2023-0654 |
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| Abstract | TD324; 煤层厚度变化是影响大直径钻孔卸压效果的重要因素之一.基于等效弹性模量原理建立了大直径钻孔卸压弹性力学模型,以某矿不同工作面为工程背景,研究了不同煤层厚度条件下大直径钻孔卸压煤体应力分布特征和能量释放规律,探讨了煤层厚度影响下大直径钻孔卸压释能机理.研究结果表明:当大直径钻孔卸压参数相同时,薄煤层中原岩应力、钻孔切向应力及其塑性区范围均大于厚煤层;大直径钻孔周边应力峰值随煤层厚度增加呈非线性减小趋势,当煤层厚度由1m增加到9m,应力峰值由 23.2 MPa降低到 20.2 MPa,降低 12.9%;大直径钻孔卸压释能率随着煤层厚度增加呈减小趋势,当煤层厚度由 1m增加到 9m,大直径钻孔卸压释能率由 68.7%降低到 45.8%,即相同大直径钻孔卸压参数条件下薄煤层卸压效果更好;当大直径钻孔卸压参数相同时,钻孔切向应力随着煤层厚度增加而减小,导致煤体破碎区和塑性区范围以及存储弹性能释放量减小,即钻孔卸压释能率降低.某矿 1208工作面和 1203工作面煤层厚度分别为 9.08、4.95 m,虽然两工作面采取了相同的大直径钻孔参数,但 1208工作面巷道围岩变形破坏更为严重,对大直径卸压钻孔参数优化后,煤体平均钻屑量由 2.48 kg/m下降到 1.76 kg/m,表明随着煤层厚度增加,需采取减小钻孔间距、增大钻孔直径等措施来达到更好的卸压效果. |
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| AbstractList | TD324; 煤层厚度变化是影响大直径钻孔卸压效果的重要因素之一.基于等效弹性模量原理建立了大直径钻孔卸压弹性力学模型,以某矿不同工作面为工程背景,研究了不同煤层厚度条件下大直径钻孔卸压煤体应力分布特征和能量释放规律,探讨了煤层厚度影响下大直径钻孔卸压释能机理.研究结果表明:当大直径钻孔卸压参数相同时,薄煤层中原岩应力、钻孔切向应力及其塑性区范围均大于厚煤层;大直径钻孔周边应力峰值随煤层厚度增加呈非线性减小趋势,当煤层厚度由1m增加到9m,应力峰值由 23.2 MPa降低到 20.2 MPa,降低 12.9%;大直径钻孔卸压释能率随着煤层厚度增加呈减小趋势,当煤层厚度由 1m增加到 9m,大直径钻孔卸压释能率由 68.7%降低到 45.8%,即相同大直径钻孔卸压参数条件下薄煤层卸压效果更好;当大直径钻孔卸压参数相同时,钻孔切向应力随着煤层厚度增加而减小,导致煤体破碎区和塑性区范围以及存储弹性能释放量减小,即钻孔卸压释能率降低.某矿 1208工作面和 1203工作面煤层厚度分别为 9.08、4.95 m,虽然两工作面采取了相同的大直径钻孔参数,但 1208工作面巷道围岩变形破坏更为严重,对大直径卸压钻孔参数优化后,煤体平均钻屑量由 2.48 kg/m下降到 1.76 kg/m,表明随着煤层厚度增加,需采取减小钻孔间距、增大钻孔直径等措施来达到更好的卸压效果. |
| Abstract_FL | The variation of coal seam thickness is one of the important factors affecting the pressure relief of large-diameter drilling hole.We have established an elastic model of pressure relief of large-diameter drilling hole based on the principle of equivalent elastic modulus.Taking two working faces of a mine as engineering background,we have studied key issues of large-diameter drilling hole regarding coal seam thickness,including the stress distribution characteristics and energy release laws,and the pressure relief and energy release mechan-ism.Several phenomena of engineering significance have been revealed by our research.Firstly,when the parameters of large-diameter drilling hole are the same,the stress of primary rock,tangential stress and plastic zone range of thin coal seam are greater than those of thick coal seam.Secondly,the peak stress around the large-diameter drilling hole decreases nonlinearly with the increase of coal seam thickness.When the coal seam thickness increases from 1 m to 9 m,the peak stress drops by 12.9%,from 23.2 MPa to 20.2 MPa.Like-wise,the pressure relief and energy release rate also decreases with the increase of coal seam thickness.When the coal seam thickness in-creases from 1 m to 9 m,the pressure relief and energy release rate of large-diameter drilling hole decreases from 68.7%to 45.8%,indicat-ing that better pressure relief effect can be achieved in thin coal seam.Moreover,when the parameters of large-diameter drilling hole are the same,the increase of coal seam thickness causes decrease of the tangential stress and thereby results in the decrease of the range of coal fragmentation zone and plastic zone,and the amount of the released elastic energy,which reduces the pressure relief energy release rate.The coal seam thicknesses of working faces 1208 and 1203 of a certain mine are 9.08 m and 4.95 m,respectively.Although the same set of large-diameter drilling hole parameters is adopted for these two working faces,the one with thicker coal seam suffers from more serious surrounding rock deformation and failure.By optimizing the parameters of large-diameter drilling hole based on our research,the average amount of drilling cuttings decreased from 2.48 kg/m to 1.76 kg/m.Therefore,we suggest that as the coal seam thickness increases,meas-ures such as reducing drilling spacing and increasing drilling diameter should be considered in order to guarantee the expected pressure re-lief effect. |
| Author | 张悦颖 张骞 郭伟耀 方恒宇 赵同彬 张东晓 吴震 王翔宇 |
| AuthorAffiliation | 山东科技大学能源与矿业工程学院,山东青岛 266590%山东科技大学能源与矿业工程学院,山东青岛 266590;长崎大学工学研究科,日本长崎852-8521%兖矿能源鄂尓多斯能化有限公司,内蒙古鄂尔多斯 017000%长崎大学工学研究科,日本长崎852-8521;石家庄铁道大学大型结构健康诊断与控制研究所,河北石家庄 050043 |
| AuthorAffiliation_xml | – name: 山东科技大学能源与矿业工程学院,山东青岛 266590%山东科技大学能源与矿业工程学院,山东青岛 266590;长崎大学工学研究科,日本长崎852-8521%兖矿能源鄂尓多斯能化有限公司,内蒙古鄂尔多斯 017000%长崎大学工学研究科,日本长崎852-8521;石家庄铁道大学大型结构健康诊断与控制研究所,河北石家庄 050043 |
| Author_FL | ZHANG Dongxiao WANG Xiangyu GUO Weiyao ZHANG Yueying ZHAO Tongbin FANG Hengyu ZHANG Qian WU Zhen |
| Author_FL_xml | – sequence: 1 fullname: ZHANG Dongxiao – sequence: 2 fullname: WANG Xiangyu – sequence: 3 fullname: GUO Weiyao – sequence: 4 fullname: ZHANG Yueying – sequence: 5 fullname: ZHAO Tongbin – sequence: 6 fullname: WU Zhen – sequence: 7 fullname: FANG Hengyu – sequence: 8 fullname: ZHANG Qian |
| Author_xml | – sequence: 1 fullname: 张东晓 – sequence: 2 fullname: 王翔宇 – sequence: 3 fullname: 郭伟耀 – sequence: 4 fullname: 张悦颖 – sequence: 5 fullname: 赵同彬 – sequence: 6 fullname: 吴震 – sequence: 7 fullname: 方恒宇 – sequence: 8 fullname: 张骞 |
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| DOI | 10.12438/cst.2023-0654 |
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| DocumentTitle_FL | Influence of coal seam thickness on pressure relief and energy release mechanism of large-diameter drilling hole |
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| Keywords | coal seam thickness rock burst 冲击地压 large-diameter drilling hole pressure relief and energy release 煤层厚度 应力演化 卸压释能 大直径钻孔 stress evolution |
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| Publisher | 长崎大学工学研究科,日本长崎852-8521%兖矿能源鄂尓多斯能化有限公司,内蒙古鄂尔多斯 017000%长崎大学工学研究科,日本长崎852-8521 山东科技大学能源与矿业工程学院,山东青岛 266590%山东科技大学能源与矿业工程学院,山东青岛 266590 石家庄铁道大学大型结构健康诊断与控制研究所,河北石家庄 050043 |
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| Title | 煤层厚度影响下大直径钻孔卸压释能机理 |
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