极近距离煤层联合开采工作面合理错距研究
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摘要
基于山西灵石某矿极近距离煤层联合开采过程中存在的安全和技术问题,采用FLAC3D数值模拟研究方法,分析了上、下煤层联合开采工作面不同错距下上工作面覆岩应力传递规律,并结合现场工程实践,得出上下工作面联合开采的合理错距。结果表明:上下工作面错距为20m时上工作面煤壁前方垂直应力较大,应力集中系数为2.12;将上下工作面布置在26~35 m范围是保证安全开采条件下比较合理的错距,通过分析现场上工作面单体支柱压力数据,压力值普遍低于35 MPa,进一步论证了该错距范围的合理性。
According to the safety and technical problems of combined mining in close-distance coal seams of a mine in Lingshi county,Shanxi,the stress transfer law of overlying strata of upper working face under the condition of different malposition of upper and lower coal seam combined mining is analyzed,using FLAC3D numerical simulation research method. And in conjunction with the field engineering practice,the reasonable malposition of the upper and lower working surfaces is obtained. The results show that: When the upper and lower working face malposition is 20 m,the vertical stress in front of the coal wall is larger,and the stress concentration coefficient is 2.12; The upper and lower working face malposition is arranged in the range of 26 m ~ 35 m,which is the reasonable malposition to ensure safe mining. By analyzing the data of single pillar pressure in the upper working face,the pressure value is generally lower than 35 MPa. Further,the rationality of the range of malposition is demonstrated.
According to the safety and technical problems of combined mining in close-distance coal seams of a mine in Lingshi county,Shanxi,the stress transfer law of overlying strata of upper working face under the condition of different malposition of upper and lower coal seam combined mining is analyzed,using FLAC3D numerical simulation research method. And in conjunction with the field engineering practice,the reasonable malposition of the upper and lower working surfaces is obtained. The results show that: When the upper and lower working face malposition is 20 m,the vertical stress in front of the coal wall is larger,and the stress concentration coefficient is 2.12; The upper and lower working face malposition is arranged in the range of 26 m ~ 35 m,which is the reasonable malposition to ensure safe mining. By analyzing the data of single pillar pressure in the upper working face,the pressure value is generally lower than 35 MPa. Further,the rationality of the range of malposition is demonstrated.
引文
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[7]康健,孙广义,董长吉.极近距离薄煤层同采工作面覆岩移动规律研究[J].采矿与安全工程学报,2010,27(1):51-56.KANG Jian,SUN Guangyi,DONG Changji.Overlying strata movement law of ultra-close thin coal seam adopting simultaneous mining face[J].Journal of Mining&Safety Engineering,2010,27(1):51-56.
[8]陈善乐,王坤,汪华君,等.近距离煤层群下行开采切眼错距确定分析[J].中国安全生产科学技术,2015,11(12):144-149.CHEN Shanle,WANG Kun,WANG Huajun,et al.Analysis on determination of alternate distance for open-off cut in downward mining of close distance coal seam group[J].Journal of Safety Science and Technology,2015,11(12):144-149.
[9]梁冰,石占山,姜福利.远距离薄煤上保护层开采方案保护有效性论证[J].中国安全科学学报,2015,25(4):17-22.LIANG Bing,SHI Zhanshan,JIANG Fulil.Research on protection result of extra-thin protective coal seam mining[J].China Safety Science Journal,2015,25(4):17-22.
[10]周泽,朱川曲,李青锋,等.考虑媒体状态的采动岩体移动规律[J].地下空间与工程学报,2017,13(5):1338-1346.ZHOU Ze,ZHU Chuanqu,LI Qingfeng,et al.The mined rock mass movement law considering the properties of coal seam[J].Chinese Journal of Underground Space and Engineering,2017,13(5):1338-1346.
[11]查文华,宋新龙,计平.坚硬顶板下极近距离煤层联合开采安全错距确定研究[J].安全与环境学报,2013,13(5):187-190.ZHUA Wenhua,SONG Xinlong,JI Ping.Determination on security malposition of combined mining in ultra-close coal seams under hard roof[J].Journal of Safety and Environment,2013,13(5):187-190.
[12]朱涛,张百胜,冯国瑞,等.极近距离煤层下层煤采场顶板结构与控制[J].煤炭学报,2010,35(2):190-193.ZHU Tao,ZHANG Baisheng,FENG Guorui,et al.Roof structure and control in the lower seam mining field in the ultra-close multiple seams[J].Journal of China Coal Society,2010,35(2):190-193.
[13]杨伟,刘长友,黄炳香,等.近距离煤层联合开采条件下工作面合理错距确定[J].采矿与安全工程学报,2012,29(1):101-105.YANG Wei,LIU Changyou,HUANG Bingxiang,et al.Determination on reasonable malposition of combined mining in close-distance coal seams[J].Journal of Mining&Safety Engineering,2012,29(1):101-105.
[14]杨伟,刘长友,杨宇.层间应力影响下近距离煤层工作面合理错距留设问题研究[J].岩石力学与工程学报,2012,31(S1):2966-2972.YANG Wei,LIU Changyou,YANG Yu.Determination on reasonable malposition of combined mining in close-distance coal seams[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(S1):2966-2972.
[15]严国超,胡耀青,宋选民,等.极近距离薄煤层群联合开采常规错距理论与物理模拟[J].岩石力学与工程学报,2009,28(3):591-597.YAN Guochao,HU Yaoqing,SONG Xuanmin,et al.Theory and physical simulation of conventional staggered distance during combined mining of ultra-close thin coal seam group[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):591-597.
[2]孙春东,杨本生,刘超.1.0 m极近距离煤层联合开采矿压规律[J].煤炭学报,2011,36(9):1423-1428.SUN Chundong,YANG Bensheng,LIU Chao.Strata behavior regularity of 1.0 m very contiguous seams combined mining[J].Journal of China Coal Society,2011,36(9):1423-1428.
[3]杜君武,黄庆享.浅埋煤层群同采工作面合理走向错距研究[J].煤炭科学技术,2017,45(9):122-127.DU Junwu,HUANG Qingxiang.Research on reasonable staggered distance along strike of simutaneous mining faces in shallow seams[J].Coal Science and Technology,2017,45(9):122-127.
[4]马海峰,李传明,李家卓,等.不同推进速度下煤岩体采动力学行为响应特征与控制[J].中国安全生产科学技术,2016,12(12):74-79.MA Haifeng,LI Chuanming,LI Jiazhuo,et al.Response characteristics of mining-induced mechanical behavior for coal and rock mass under different advancing speed and its control[J].Journal of Safety Science and Technology,2016,12(12):74-79.
[5]王路军,朱卫兵,许家林,等.浅埋深极近距离煤层工作面矿压显现规律研究[J].煤炭科学技术,2013,41(3):47-50.WANG Lujun,ZHU Weibing,XU Jialin,et al.Study on mine strata pressure behavior law of coal mining face in ultra contiguous seam with shallow depth[J].Coal Science and Technology,2013,41(3):47-50.
[6]李浩,石必明,李耀.强突松软近距离煤层群石门揭煤防突技术研究[J].中国安全生产科学技术,2014,10(1):98-102.LI Hao,SHI Biming,LI Yao.Study on technologies of rock crosscut coal uncovering and avoiding outburst of gas in condition of soft coal seams with strong gas outburst risk in short distance[J].Journal of Safety Science and Technology,2014,10(1):98-102.
[7]康健,孙广义,董长吉.极近距离薄煤层同采工作面覆岩移动规律研究[J].采矿与安全工程学报,2010,27(1):51-56.KANG Jian,SUN Guangyi,DONG Changji.Overlying strata movement law of ultra-close thin coal seam adopting simultaneous mining face[J].Journal of Mining&Safety Engineering,2010,27(1):51-56.
[8]陈善乐,王坤,汪华君,等.近距离煤层群下行开采切眼错距确定分析[J].中国安全生产科学技术,2015,11(12):144-149.CHEN Shanle,WANG Kun,WANG Huajun,et al.Analysis on determination of alternate distance for open-off cut in downward mining of close distance coal seam group[J].Journal of Safety Science and Technology,2015,11(12):144-149.
[9]梁冰,石占山,姜福利.远距离薄煤上保护层开采方案保护有效性论证[J].中国安全科学学报,2015,25(4):17-22.LIANG Bing,SHI Zhanshan,JIANG Fulil.Research on protection result of extra-thin protective coal seam mining[J].China Safety Science Journal,2015,25(4):17-22.
[10]周泽,朱川曲,李青锋,等.考虑媒体状态的采动岩体移动规律[J].地下空间与工程学报,2017,13(5):1338-1346.ZHOU Ze,ZHU Chuanqu,LI Qingfeng,et al.The mined rock mass movement law considering the properties of coal seam[J].Chinese Journal of Underground Space and Engineering,2017,13(5):1338-1346.
[11]查文华,宋新龙,计平.坚硬顶板下极近距离煤层联合开采安全错距确定研究[J].安全与环境学报,2013,13(5):187-190.ZHUA Wenhua,SONG Xinlong,JI Ping.Determination on security malposition of combined mining in ultra-close coal seams under hard roof[J].Journal of Safety and Environment,2013,13(5):187-190.
[12]朱涛,张百胜,冯国瑞,等.极近距离煤层下层煤采场顶板结构与控制[J].煤炭学报,2010,35(2):190-193.ZHU Tao,ZHANG Baisheng,FENG Guorui,et al.Roof structure and control in the lower seam mining field in the ultra-close multiple seams[J].Journal of China Coal Society,2010,35(2):190-193.
[13]杨伟,刘长友,黄炳香,等.近距离煤层联合开采条件下工作面合理错距确定[J].采矿与安全工程学报,2012,29(1):101-105.YANG Wei,LIU Changyou,HUANG Bingxiang,et al.Determination on reasonable malposition of combined mining in close-distance coal seams[J].Journal of Mining&Safety Engineering,2012,29(1):101-105.
[14]杨伟,刘长友,杨宇.层间应力影响下近距离煤层工作面合理错距留设问题研究[J].岩石力学与工程学报,2012,31(S1):2966-2972.YANG Wei,LIU Changyou,YANG Yu.Determination on reasonable malposition of combined mining in close-distance coal seams[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(S1):2966-2972.
[15]严国超,胡耀青,宋选民,等.极近距离薄煤层群联合开采常规错距理论与物理模拟[J].岩石力学与工程学报,2009,28(3):591-597.YAN Guochao,HU Yaoqing,SONG Xuanmin,et al.Theory and physical simulation of conventional staggered distance during combined mining of ultra-close thin coal seam group[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):591-597.
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