| 深部煤层采动破坏电位响应特征与分布规律 |
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| 引用本文： | 王恩元,李忠辉,钮月,刘盛东,沈荣喜,李德行,张昕.深部煤层采动破坏电位响应特征与分布规律[J].煤田地质与勘探,2021,49(1):241-248. |
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| 作者姓名： | 王恩元 李忠辉 钮月 刘盛东 沈荣喜 李德行 张昕 |
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| 作者单位： | 中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;中国矿业大学煤矿瓦斯治理国家工程研究中心;中国矿业大学安全工程学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学深部资源流态化开采前沿科学研究中心 |
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| 基金项目： | 国家自然科学基金项目(51934007,51674254);山东省重大科技创新工程项目(2019JZZY020505)。 |
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| 摘 要： | 为了研究采动破坏过程煤体电位信号的响应特征与规律，利用自主研发的矿用电位仪在河南薛湖煤矿25050综采工作面进行了现场测试。结果表明:煤层采动破坏过程能够产生显著的电位信号，电位响应特征能够揭示煤体应力状态的变化，随着回采工作面的推进，电位强度呈先增加后降低趋势，利用钻孔卸压后，煤体应力降低，电位信号随之下降；电位强度与钻屑量的空间分布规律基本一致，利用电位空间分布规律能够识别应力异常特征，出现“卡钻”现象时，煤体应力异常，电位强度出现峰值；当瓦斯指标超限或出现大能量煤炮事件时，电位信号呈超前增大趋势并伴随剧烈波动，利用电位信号能够识别煤岩动力灾害危险的前兆特征。研究成果表明利用电位手段可现场监测煤体采动破坏、预警煤岩动力灾害。
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| 关 键 词： | 深部煤层 采动破坏 电位响应 特征规律 煤岩动力灾害 |
| 收稿时间： | 2020-11-19 |
Characteristics and distribution laws of electric potential response to mining failure of deep coal seam |
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| WANG Enyuan,LI Zhonghui,NIU Yue,LIU Shengdong,SHEN Rongxi,LI Dexing,ZHANG Xin.Characteristics and distribution laws of electric potential response to mining failure of deep coal seam[J].Coal Geology & Exploration,2021,49(1):241-248. |
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| Authors: | WANG Enyuan LI Zhonghui NIU Yue LIU Shengdong SHEN Rongxi LI Dexing ZHANG Xin |
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| Institution: | (Key Laboratory of Coal Methane and Fire Control,Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;National Engineering Research Center for Coal Gas Control,China University of Mining and Technology,Xuzhou 221116,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory for GeoMechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;Frontier Scientific Research Center of Fluidized Mining of Deep Resources,China University of Mining and Technology,Xuzhou 221116,China) |
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| Abstract: | To study the response characteristics and laws on electric potential(EP)signal of the coal body in the mining failure process,a self-developed mine EP meter was utilized to conduct field tests in the No.25050 fully mechanized mining face of Xuehu Coal Mine.The results show that the EP signals can be produced significantly during coal seam mining failure process,and the EP response characteristics can reveal the changes of stress state in coal body.As the working face advances,the EP intensity firstly increases and then decreases.The EP intensity decreases significantly after the construction of stress-relief drillings.Simultaneously,the spatial distribution characteristics of EP intensity can identify the zones with abnormal stress in coal seam.The distribution law of the EP intensity and the amount of drill cuttings are similar.When the“stuck”phenomenon occurs during drilling process,abnormal stress is observed in coal body,and the EP intensity reaches a peak value suddenly.The temporal EP signal has the characteristics of precursory response to the hazard of coal and rock dynamic disasters.When the gas indicator exceeds the limit or a large-energy coal cannon event occurs,the EP signal shows a leading increase trend and is accompanied by violent fluctuations.The study results are expected to provide a new idea and an application basis for the utilization of EP methods to monitor coal mining failure and early warning of coal and rock dynamic disasters. |
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| Keywords: | deep coal seam mining failure electric potential response characteristic law coal and rock dynamic disaster |
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