保护层开采防突效果区域时空特征分析
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摘要
为获得保护层开采区域防突效果的时空演化特征,确定区域抽采补充措施相关参数,制定更优的被保护煤层采掘时空规划,建立伏岩应力(变形)力学模型开展数值模拟,并现场考察被保护煤层参数变化的时空分布情况。结果表明:覆(伏)岩层岩性及结构、煤层开采厚度、工作面长度等是影响保护效果时空分布特征的主要因素;被保护区域煤层的应力呈W型分布,变形呈M型分布;随工作面位置变化,瓦斯压力先增加后降低,膨胀率和透气性先降低后增加;煤岩变形量相对于工作面位置的推移存在一定的迟滞性,体现了煤岩变形的蠕变特征。
The paper aims to study temporal-spatial evolution features of outburst prevention effect in protective layer mining area and provide the basis for determining gas drainage parameters and mining sequence. A mechanical modle for underlying rock stress( deformation) was established to carry out the numerical simulation. The spatiotemporal distribution of parameters of protected coal seam was investigated.The results show that main factors influencing spatiotemporal distribution of protection effect are rock quality and structure,coal seam mining thickness and length of mining face,that the distribution of stress of protected coal seam is W-shaped and that of deformation is M-shaped,that with the change of mining face position, the gas pressure firstly increases and then decreases, while the expansion rate and permeability firstly decrease and then increase,and that the change of coal deformation lags behind the advancing of mining face position,which shows the creep characteristics of the coal deformation.
The paper aims to study temporal-spatial evolution features of outburst prevention effect in protective layer mining area and provide the basis for determining gas drainage parameters and mining sequence. A mechanical modle for underlying rock stress( deformation) was established to carry out the numerical simulation. The spatiotemporal distribution of parameters of protected coal seam was investigated.The results show that main factors influencing spatiotemporal distribution of protection effect are rock quality and structure,coal seam mining thickness and length of mining face,that the distribution of stress of protected coal seam is W-shaped and that of deformation is M-shaped,that with the change of mining face position, the gas pressure firstly increases and then decreases, while the expansion rate and permeability firstly decrease and then increase,and that the change of coal deformation lags behind the advancing of mining face position,which shows the creep characteristics of the coal deformation.
引文
[1]胡千庭.突出矿井实现安全高效开采的技术途径探讨[J].煤炭科学技术,2015,43(1):50-53.HU Qianting. Dscussion on technical access to realize safety and high efficient mining in outburst mine[J]. Coal Science and Technology,2015,43(1):50-53.
[2]梁冰,石占山,姜福利,等.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 Fuli,et al.Research on protection result of extra-thin protective coal seam mining[J].China Safety Science Journal,2015,25(4):17-22.
[3]朱红青,张民波,冯世梁,等.高位孔抽采上被保护层卸压瓦斯的研究及其应用[J].中国安全科学学报,2013,23(2):92-96.ZHU Hongqing,ZHANG Minbo,FENG Shiliang,et al. Study on relief-pressure gas drainage in upper protected layer with high-level borehole and its application[J].China Safety Science Journal,2013,23(2):92-96.
[4]齐庆新,程志恒,张浪,等.近距离突出危险煤层群上保护层开采可行性分析[J].煤炭科学技术,2015,43(4):43-47,52.QI Qingxin,CHENG Zhiheng,ZHANG Lang,et al. Analysis on feasibility of upper protective layers mining in contiguous seams with coal and gas outburst hazard[J].Coal Science and Technology,2015,43(4):43-47,52.
[5]王永秀,齐庆新,徐刚,等.华丰矿保护层开采数值模拟研究[J].煤矿开采,2003,8(4):4-7.WANG Yongxiu,QI Qingxin,XU Gang,et al. Numerical study on the protective mining in seam No. 6 of huafeng coal mine[J]. Coal Mining Technology,2003,8(4):4-7.
[6]戴广龙,郭良经,张树川.海孜矿上保护层开采卸压保护范围数值模拟研究[J].中国安全科学学报,2013,23(7):13-18.DAI Guanglong,GUO Liangjing,ZHANG Shuchuan. Numerical simulation of haizi mine upper protective layer mining's protection scope[J].China Safety Science Journal,2013,23(7):13-18.
[7]王伟,程远平,袁亮,等.深部近距离上保护层底板裂隙演化及卸压瓦斯抽采时效性[J].煤炭学报,2016,41(1):138-148.WANG Wei,CHENG Yuanping,YUAN Liang,et al. Floor fracture evolution and relief gas drainage timeliness in deeper underground short-distance upper protective coal seam extraction[J]. Journal of China Coal Society,2016,41(1):138-148.
[8]薛东杰,周宏伟,孔琳,等.采动条件下被保护层瓦斯卸压增透机理研究[J].岩土工程学报,2012,34(10):1 910-1 916.XUE Dongjie,ZHOU Hongwei,KONG Lin,et al. Mechanism of unloading-induced permeability increment of protected coal seam under mining[J]. Chinese Journal of Geotechnical Engineering,2012,34(10):1 910-1 916.
[9]刘泽功,袁亮,戴广龙,等.采场覆岩裂隙特征研究及在瓦斯抽放中应用[J].安徽理工大学学报:自然科学版,2004,24(4):10-15.LIU Zegong,YUAN Liang,DAI Guanglong,et al. Study on the characteristics of the gob roof cracks in stopes and its application in gas drainage[J]. Journal of Anhui University of Science and Technology:Natural Science,2004,24(4):10-15.
[10]涂敏,黄乃斌,刘宝安.远距离下保护层开采上覆煤岩体卸压效应研究[J].采矿与安全工程学报,2007,24(4):418-421,426.TU Min,HUANG Naibin,LIU Baoan. Research on pressure-relief effect of overlying coal rock body using far distance lower protective seam exploitation method[J].Journal of Mining and Safety Engineering,2007,24(4):418-421,426.
[11]齐庆新,季文博,元继宏,等.底板贯穿型裂隙现场实测及其对瓦斯抽采的影响[J].煤炭学报,2014,39(8):1 552-1 558.QI Qingxin,JI Wenbo,YUAN Jihong,et al. In-situ observation on the floor-connected crack field and its effects on methane extraction[J].Journal of China Coal Society,2014,39(8):1 552-1 558.
[2]梁冰,石占山,姜福利,等.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 Fuli,et al.Research on protection result of extra-thin protective coal seam mining[J].China Safety Science Journal,2015,25(4):17-22.
[3]朱红青,张民波,冯世梁,等.高位孔抽采上被保护层卸压瓦斯的研究及其应用[J].中国安全科学学报,2013,23(2):92-96.ZHU Hongqing,ZHANG Minbo,FENG Shiliang,et al. Study on relief-pressure gas drainage in upper protected layer with high-level borehole and its application[J].China Safety Science Journal,2013,23(2):92-96.
[4]齐庆新,程志恒,张浪,等.近距离突出危险煤层群上保护层开采可行性分析[J].煤炭科学技术,2015,43(4):43-47,52.QI Qingxin,CHENG Zhiheng,ZHANG Lang,et al. Analysis on feasibility of upper protective layers mining in contiguous seams with coal and gas outburst hazard[J].Coal Science and Technology,2015,43(4):43-47,52.
[5]王永秀,齐庆新,徐刚,等.华丰矿保护层开采数值模拟研究[J].煤矿开采,2003,8(4):4-7.WANG Yongxiu,QI Qingxin,XU Gang,et al. Numerical study on the protective mining in seam No. 6 of huafeng coal mine[J]. Coal Mining Technology,2003,8(4):4-7.
[6]戴广龙,郭良经,张树川.海孜矿上保护层开采卸压保护范围数值模拟研究[J].中国安全科学学报,2013,23(7):13-18.DAI Guanglong,GUO Liangjing,ZHANG Shuchuan. Numerical simulation of haizi mine upper protective layer mining's protection scope[J].China Safety Science Journal,2013,23(7):13-18.
[7]王伟,程远平,袁亮,等.深部近距离上保护层底板裂隙演化及卸压瓦斯抽采时效性[J].煤炭学报,2016,41(1):138-148.WANG Wei,CHENG Yuanping,YUAN Liang,et al. Floor fracture evolution and relief gas drainage timeliness in deeper underground short-distance upper protective coal seam extraction[J]. Journal of China Coal Society,2016,41(1):138-148.
[8]薛东杰,周宏伟,孔琳,等.采动条件下被保护层瓦斯卸压增透机理研究[J].岩土工程学报,2012,34(10):1 910-1 916.XUE Dongjie,ZHOU Hongwei,KONG Lin,et al. Mechanism of unloading-induced permeability increment of protected coal seam under mining[J]. Chinese Journal of Geotechnical Engineering,2012,34(10):1 910-1 916.
[9]刘泽功,袁亮,戴广龙,等.采场覆岩裂隙特征研究及在瓦斯抽放中应用[J].安徽理工大学学报:自然科学版,2004,24(4):10-15.LIU Zegong,YUAN Liang,DAI Guanglong,et al. Study on the characteristics of the gob roof cracks in stopes and its application in gas drainage[J]. Journal of Anhui University of Science and Technology:Natural Science,2004,24(4):10-15.
[10]涂敏,黄乃斌,刘宝安.远距离下保护层开采上覆煤岩体卸压效应研究[J].采矿与安全工程学报,2007,24(4):418-421,426.TU Min,HUANG Naibin,LIU Baoan. Research on pressure-relief effect of overlying coal rock body using far distance lower protective seam exploitation method[J].Journal of Mining and Safety Engineering,2007,24(4):418-421,426.
[11]齐庆新,季文博,元继宏,等.底板贯穿型裂隙现场实测及其对瓦斯抽采的影响[J].煤炭学报,2014,39(8):1 552-1 558.QI Qingxin,JI Wenbo,YUAN Jihong,et al. In-situ observation on the floor-connected crack field and its effects on methane extraction[J].Journal of China Coal Society,2014,39(8):1 552-1 558.