远距离煤层开采工作面布置方式卸压增透效应
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摘要
为了研究远距离煤层上行开采工作面布置方式对卸压增透效果的影响,根据潘二煤矿11223工作面地质条件,通过FLAC~(3D)数值模拟软件研究远距离煤层卸压开采应力场、位移场、裂隙场分布特征,并以卸压系数为判据,确定工作面卸压增透范围。研究表明:西二段工作面采用垂直布置方式,下方11223工作面开采会引起上覆11224工作面位移场、应力场发生明显变化,11224工作面中部卸压系数达90. 37%,卸压效果良好;东一段11224工作面采用风巷外错90 m、机巷内错90 m的方式布置,导致11224工作面下部卸压系数88. 97%,卸压效果较好,而在工作面上部卸压效果不明显。通过对比,可以确定远距离煤层上行开采时,工作面采用垂直布置可获得更好的卸压增透效果。
In order to study the effect of pressure released and permeability improved induced by working face arrangement under long distance coal seam upward mining,according to the geological conditions of the 11223 working face in Panji No.2 Coal Mine,the FLAC~(3D) numerical simulation software was used to study the distribution character of stress field,displacement field and crack field after the pressure relived mining,and make sure the pressure released and permeability improved area depend on stress relief coefficient under different mining condition. The results indicate that: the working faces were vertically arrangement in the west second segment,the mining of lower 11223 working face can induce remarkable change in stress field,displacement field of upper 11224 working face,the stress relief coefficient is 90. 37% in the middle part of 11224 working face,which can make a good stress relief effect. However,in the east first segment,the 11224 working face used the 90 m outward stagger mode in ventilation entry and 90 m inner stagger mode in conveyor entry,the stress relief coefficient is 88. 97% in the lower part of 11224 working face,this can make a good stress relief effect,while the stress relief is very feeble in the upper part. To sum up,it can make a better effect of pressure released and permeability improved when working faces apply vertically arrangement under long distance coal seam upward mining.
In order to study the effect of pressure released and permeability improved induced by working face arrangement under long distance coal seam upward mining,according to the geological conditions of the 11223 working face in Panji No.2 Coal Mine,the FLAC~(3D) numerical simulation software was used to study the distribution character of stress field,displacement field and crack field after the pressure relived mining,and make sure the pressure released and permeability improved area depend on stress relief coefficient under different mining condition. The results indicate that: the working faces were vertically arrangement in the west second segment,the mining of lower 11223 working face can induce remarkable change in stress field,displacement field of upper 11224 working face,the stress relief coefficient is 90. 37% in the middle part of 11224 working face,which can make a good stress relief effect. However,in the east first segment,the 11224 working face used the 90 m outward stagger mode in ventilation entry and 90 m inner stagger mode in conveyor entry,the stress relief coefficient is 88. 97% in the lower part of 11224 working face,this can make a good stress relief effect,while the stress relief is very feeble in the upper part. To sum up,it can make a better effect of pressure released and permeability improved when working faces apply vertically arrangement under long distance coal seam upward mining.
引文
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[15]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.
[16]张向阳,涂敏,杨科,等.保护层卸压开采两煤层终采线合理位置确定[J].煤炭科学技术,2012,40(2):15-18.ZHANG Xiangyang,TU Min,YANG Ke,et al. Determination on rational location of final terminal mining line for protective seam pressure releasing and mining in two seam[J]. Coal Science and Technology,2012,40(2):15-18.
[17]李志华,华心祝,杨科,等.采空区下孤岛工作面矿压显现规律研究[J].煤炭工程,2013,45(11):72-74,78.LI Zhihua,HUA Xinzhu,YANG Ke,et al. Study on mine strata pressure behavior law of coal mining face in seam island under goaf[J]. Coal Engineering,2013,45(11):72-74,78.
[2]谢和平,高峰,周宏伟,等.煤与瓦斯共采中煤层增透率理论与模型研究[J].煤炭学报,2013,38(7):1 101-1 108.XIE Heping,GAO Feng,ZHOU Hongwei,et al. On theoretical and modeling approach to mining enhanced permeability for simultaneous exploitation of coal and gas[J]. Journal of China Coal Society,2013,38(7):1 101-1 108.
[3]袁亮.低透气性煤层群瓦斯抽采理论与技术[M].北京:煤炭工业出版社,2004:204-242.
[4]袁亮.低透高瓦斯煤层群安全开采关键技术研究[J].岩石力学与工程学报,2008,27(7):1 370-1 379.YUAN Liang. Key technique of safe mining in low permeability and methane-rich seam group[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(7):1 370-1 379.
[5]涂敏,袁亮,缪协兴,等.保护层卸压开采煤层变形与增透效应研究[J].煤炭科学技术,2013,41(1):40-43.TU Min,YUAN Liang,MIAO Xiexing,et al. Study on seam deformation and permeability improved effect of pressure released mining in protective seam[J]. Coal Science and Technology,2013,41(1):40-43.
[6]国家安全生产监督管理总局,国家煤矿安全监察局.煤矿安全规程[M].北京:煤炭工业出版社,2010∶114-115.
[7]肖同强,李允生,顾树生.高瓦斯煤层群保护层开采卸压效果数值模拟[J].河南理工大学学报:自然科学版,2013,32(5):527-530.XIAO Tongqiang,LI Yunsheng,GU Shusheng. Study on numerical simulation of pressure relief effect of protective seam mining in high gas coal seams[J]. Journal of Henan Polytetechnic University:Natural Science,2013,32(5):527-530.
[8]杜泽生,秦波涛,范迎春.保护层开采效果可信度评价模型及其应用研究[J].采矿与安全工程学报,2017,34(1):185-191.DU Zesheng,QIN Botao,FAN Yingchun. A reliability evaluation model of exploitation efficiency of the protective layer and its application[J]. Journal of Mining&Safety Engineering,2017,34(1):185-191.
[9]程祥,赵光明,李英明,等.软岩保护层开采卸压增透效应及瓦斯抽采技术研究[J].采矿与安全工程学报,2018,35(5):1 045-1 053.CHENG Xiang,ZHAO Guangming,LI Yingming,et al. Study on relief-pressure antireflective effect and gas extraction technology for mining soft rock protective seam[J]. Journal of Mining&Safety Engineering,2018,35(5):1 045-1 053.
[10]王文,李化敏,高保彬,等.远距离保护层开采煤层渗透特性及瓦斯抽采技术研究[J].中国安全生产科学技术,2014,10(11):84-89.WANG Wen,LI Huamin,GAO Baobin,et al. Study on permeability characteristic of coal seam and gas extraction techniques in coal mining with long distance protection coal seam[J]. Journal of Safety Science and Technology,2014,10(11):84-89.
[11]张树川,朱丹.远距离被保护层被保护区域预抽瓦斯效果研究[J].中国安全生产科学技术,2014,10(7):32-37.ZHANG Shuchuan,ZHU Dan. Study on gas drainage effect in protected area of the protected coal seam layer with long distance[J]. Journal of Safety Science and Technology,2014,10(7):32-37.
[12]施峰,王宏图,舒才.间距对上保护层开采保护效果影响的相似模拟实验研究[J].中国安全生产科学技术,2017,13(12):138-144.SHI Feng,WANG Hongtu,SHU Cai. Similar simulation test study on influence of inter coal seam distance on protect-tion effect in upper protective layer mining[J]. Journal of Safety Science and Technology,2017,13(12):138-144.
[13]陈彦龙,吴豪帅,张明伟,等.煤层厚度与层间岩性对上保护层开采效果的影响研究[J].采矿与安全工程学报,2016,33(4):578-584.CHEN Yanlong,WU Haoshuai,ZHANG Mingwei,et al. Research on the upper protective coal seam mining effect induced by coal thickness and interburden rock properties[J]. Journal of Mining&Safety Engineering,2016,33(4):578-584.
[14]李晓艳,孙光中,付江伟.卸围压条件下含瓦斯煤渗透性演化试验研究[J].中国安全科学学报,2017,27(8):114-119.LI Xiaoyan,SUN Guangzhong,FU Jiangwei. Experimental study on evolution of permeability of coal containing methane under confining pressure unloading condition[J]. China Safety Science Journal,2017,27(8):114-119.
[15]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.
[16]张向阳,涂敏,杨科,等.保护层卸压开采两煤层终采线合理位置确定[J].煤炭科学技术,2012,40(2):15-18.ZHANG Xiangyang,TU Min,YANG Ke,et al. Determination on rational location of final terminal mining line for protective seam pressure releasing and mining in two seam[J]. Coal Science and Technology,2012,40(2):15-18.
[17]李志华,华心祝,杨科,等.采空区下孤岛工作面矿压显现规律研究[J].煤炭工程,2013,45(11):72-74,78.LI Zhihua,HUA Xinzhu,YANG Ke,et al. Study on mine strata pressure behavior law of coal mining face in seam island under goaf[J]. Coal Engineering,2013,45(11):72-74,78.