基于微震监测的高强度开采工作面煤岩破坏规律研究
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摘要
高强度开采工作面煤岩破坏规律是采场支架与围岩关系研究的关键。以山西潞安集团余吾煤业S2205高强度开采工作面为工程背景,利用微震监测技术并结合传统矿压实测技术,对工作面煤岩破坏规律进行实测分析。研究结果表明:利用微震事件频次和能量分布可判断顶底板岩层的破坏范围;微震事件的发生和工作面的推进度有关,当推进度达到一定程度、突然发生大变化、停产后复产时,微震事件会急剧增多,应该保持稳定合理的推进速度;微震事件周期性地超前于周期来压,具体表现为能量和频次的周期性变化,可以依此预测工作面周期来压;高强度开采工作面煤岩破裂会产生微震事件,事件的频次和能量能反映煤岩破裂程度,事件发生的位置即为超前支承压力影响峰值区域。研究结果可为类似条件下高强度开采工作面的设备选型、工艺选择确定提供理论依据和工程参考。
The failure law of coal rock in high-intensity working face is the key to study the relationship between stope support and surrounding rocks.Taking the S2205high-intensity working face of Yuwu Coal mine as the engineering background,the failure law of coal rock in the working face was measured and analyzed by microseismic monitoring technology and traditional compaction measurement technology.The results were concluded as follows.Firstly,the failure range of roof and floor strata could be judged by the frequency and energy distribution of microseismic events.Secondly,the occurrence of microseismic events was related to the advance degree of working face.When the advance degree reached a certain value,great change suddenly occurred,or production was resumed after shutdown,the microseismic events would increase sharply.So,the stable and reasonable advance speed should be maintained.Thirdly,microseismic events were ahead of the periodic weighting periodically,which was manifested in the periodic variation of energy and frequency.Based on this,the periodic weighting of working face could be predicted.Finally,microseismic events would be produced by coal rock failure of high-intensity working face.And the frequency and energy of the events could reflect the failure degree of coal rock.The location of the events was the peak area affected by the advance abutment pressure.The research results could provide a theoretical basis and engineering reference for equipment selection and technology selection of high-intensity working face under similar conditions.
The failure law of coal rock in high-intensity working face is the key to study the relationship between stope support and surrounding rocks.Taking the S2205high-intensity working face of Yuwu Coal mine as the engineering background,the failure law of coal rock in the working face was measured and analyzed by microseismic monitoring technology and traditional compaction measurement technology.The results were concluded as follows.Firstly,the failure range of roof and floor strata could be judged by the frequency and energy distribution of microseismic events.Secondly,the occurrence of microseismic events was related to the advance degree of working face.When the advance degree reached a certain value,great change suddenly occurred,or production was resumed after shutdown,the microseismic events would increase sharply.So,the stable and reasonable advance speed should be maintained.Thirdly,microseismic events were ahead of the periodic weighting periodically,which was manifested in the periodic variation of energy and frequency.Based on this,the periodic weighting of working face could be predicted.Finally,microseismic events would be produced by coal rock failure of high-intensity working face.And the frequency and energy of the events could reflect the failure degree of coal rock.The location of the events was the peak area affected by the advance abutment pressure.The research results could provide a theoretical basis and engineering reference for equipment selection and technology selection of high-intensity working face under similar conditions.
引文
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[9]杨永康.特厚煤层大采高综放采场覆岩移动规律及围岩控制研究[M].北京:煤炭工业出版社,2014.
[2]杨胜利,王兆会,蒋威,等.高强度开采工作面煤岩灾变的推进速度效应分析[J].煤炭学报,2016,41(3):586-594.
[3]刘超.采动煤岩瓦斯动力灾害致灾机理及微震预警方法研究[D].大连:大连理工大学,2011.
[4]许红杰,夏永学,蓝航,等.微震活动规律及其在煤矿开采中的应用[J].煤矿开采,2012,17(2):93-95,16.
[5]丁学龙,王恩元,贾迎梅,等.煤岩胀裂破坏过程微震特性试验[J].煤炭科学技术,2009,37(8):32-35.
[6]杨永杰,陈绍杰,张兴民,等.煤矿采场覆岩破坏的微地震监测预报研究[J].岩土力学,2007(7):1407-1410.
[7]邓志刚,任勇,毛德兵,等.波兰EMAG矿压监测系统功能及应用[J].煤炭科学技术,2008(10):1-4.
[8]任勇.华丰煤矿微震监测与冲击地压影响因素分析[J].煤炭科学技术,2010,38(7):1-5,99.
[9]杨永康.特厚煤层大采高综放采场覆岩移动规律及围岩控制研究[M].北京:煤炭工业出版社,2014.