| 辛安煤矿1402工作面临空窄煤柱采掘响应及动态加固 |
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| 引用本文： | 汪北方,梁冰,刘维,张晶,迟海波,刘亚辉.辛安煤矿1402工作面临空窄煤柱采掘响应及动态加固[J].煤田地质与勘探,2020,48(1):145-153. |
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| 作者姓名： | 汪北方 梁冰 刘维 张晶 迟海波 刘亚辉 |
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| 作者单位： | 辽宁工程技术大学矿业学院,辽宁 阜新 123000;煤炭资源与安全开采国家重点实验室,江苏徐州 221008;煤炭开采水资源保护与利用国家重点实验室,北京 100011;辽宁工程技术大学力学与工程学院,辽宁 阜新 123000;辽宁工程技术大学土木工程学院,辽宁 阜新 123000;辽宁工程技术大学理学学院,辽宁 阜新 123000;辽宁工程技术大学矿业学院,辽宁 阜新 123000 |
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| 基金项目： | 国家自然科学基金项目(51704139);煤炭资源与安全开采国家重点实验室开放研究基金项目(SKLCRSM18KF011);煤炭开采水资源保护与利用国家重点实验室开放研究基金项目(SHJT-17-42.7)。 |
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| 摘 要： | 随着我国煤炭资源去产能整合煤矿的增多，复采工作面临空窄煤柱采动失稳问题日益凸显，已严重制约矿井安全高效生产。为此，针对辛安煤矿复采1402工作面辅运巷道5号钻场临空窄煤柱稳定性控制的工程难题，运用数值模拟与理论分析相结合的方法，探究5号钻场临空窄煤柱稳定性采掘扰动响应特征，提出5号钻场临空窄煤柱动态注浆加固技术方案并开展现场应用和效果检验。研究结果表明:1402工作面辅运巷道掘进对5号钻场临空窄煤柱稳定性影响较小；在1402工作面回采期间，距5号钻场18~6 m范围，临空窄煤柱集中垂直应力由非对称马鞍形分布逐渐过渡为拱形分布；距5号钻场6 m时，临空窄煤柱承载叠加垂直应力超过煤体强度，塑性区完全贯通，极易破坏失稳；现场采用MP364型注浆材料及专用注浆设备对5号钻场临空窄煤柱前后5 m区域进行加固，动态注浆始终超前工作面10 m，通过深孔窥视和气体监测手段验证临空窄煤柱良好的封堵固化效果，保障了工作面安全回采，为我国整合矿井类似条件下煤柱稳定性控制提供借鉴和参考。移动阅读
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| 关 键 词： | 复采工作面 临空窄煤柱 应力叠加 动态注浆 加固效果检验 辛安煤矿 |
| 收稿时间： | 2019-04-11 |
Mining response and dynamic reinforcement for narrow coal pillar next to goaf in working face 1402 of Xin’an coal mine |
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| WANG Beifang,LIANG Bing,LIU Wei,ZHANG Jing,CHI Haibo,LIU Yahui.Mining response and dynamic reinforcement for narrow coal pillar next to goaf in working face 1402 of Xin’an coal mine[J].Coal Geology & Exploration,2020,48(1):145-153. |
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| Authors: | WANG Beifang LIANG Bing LIU Wei ZHANG Jing CHI Haibo LIU Yahui |
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| Institution: | (School of Mines,Liaoning Technical University,Fuxin 123000,China;State Key Laboratory of Coal Resources and Safe Mining,Xuzhou 221008,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 100011,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;School of Civil Engineering and Transportation,Liaoning Technical University,Fuxin 123000,China;School of Science,Liaoning Technical University,Fuxin 123000,China) |
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| Abstract: | With the increase of integrating coal mines under national coal de-capacity policy,the mining instability phenomenon of narrow coal pillar next to goaf is increasingly prominent,which has seriously restricted the safety and efficient production in coal mines.Therefore,stability control engineering problem of narrow coal pillar next to goaf,near No.5 drilling field on air return roadway of repeated mining face 1402 in Xin’an coal mine was as study object,a method of combining numerical simulation and theoretical analysis was used to explore the mining disturbance response characteristics of narrow coal pillar stability next to goaf,near No.5 drilling field,then dynamic grouting reinforcement technical scheme for narrow coal pillar next to goaf,near No.5 drilling field was put forward and field application and effect test were carried out.The study results showed that:the stability of narrow coal pillar next to goaf,near No.5 drilling field was slightly affected by air return roadway excavating in working face 1402.While in the mining period of working face 1402,within the range of 18-6 m from No.5 drilling field,the concentrated vertical stress in narrow coal pillar next to goaf gradually transformed from asymmetrical saddle-shaped distribution into arched distribution.When working face was 6 m away from No.5 drilling field,the superimposing vertical stress in narrow coal pillar next to goaf exceeded coal strength,and the plastic zone was completely connected,which was extremely easy to failure and even destabilization.In the field,MP364 type grouting material and special grouting equipment were applied to conduct dynamic grouting reinforcement 5 m of front area and rear area in narrow coal pillar near No.5 drilling field,which was always 10 m ahead working face.Good grouting curing effect of coal pillar next to goaf was verified through the deep hole peeping and gas monitoring,and ensured the working face mined safely,provided a significant reference for similar condition of coal pillar stability control in integrating coal mines of our country. |
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| Keywords: | repeated mining face narrow coal pillar next to goaf stress superposition dynamic grouting reinforcement detecting Xin’an coal mine |
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