火成岩顶板对工作面冲击地压影响的理论分析
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摘要
针对火成岩顶板诱发工作面冲击地压的问题,以新安煤矿八采区首采面为工程背景,采用顶板剪切梁模型,考虑煤层的塑性软化性质,分析了火成岩侵入对冲击地压的影响。结果表明:火成岩顶板厚度、剪切弹性模量和抗剪强度3个指标对诱发冲击地压具有重要影响。"煤层-火成岩顶板"变形系统既可能发生顶板断裂型冲击地压,也可能发生煤体压缩型冲击地压,计算得到了2种冲击地压的发生条件。定义了火成岩顶板过渡厚度、过渡剪切模量和过渡抗剪强度,分别给出了以这3项指标判定冲击地压是否发生及发生类型的判别方法。对于新安煤矿八采区首采面,火成岩顶板厚度小于过渡厚度,剪切弹性模量大于过渡剪切模量,抗剪强度大于过渡强度,所以该工作面火成岩顶板首先断裂,将发生顶板断裂型冲击地压。
This paper aims to tackle the challenge of rock burst caused by igneous rock roof in coal mines. Based on the first longwall face of No.8 mining area at Xin'an Coal Mine, this research analyzed the impact of igneous rock intrusion on rockburst by using the roof shear beam model and considering the plasticity softening property of the coal seam. The results suggested that the roof thickness, shear modulus and shear strength have a critical impact on rockburst propensity. The deformation system of"the coal seam-igneous rock roof" may induce either the roof fracture type rockburst or the coal compression type rockburst, and the conditions for the occurrence of these two types rock bursts were proposed. The thickness, shear modulus and shear strength of a transitional layer, which is between the igneous rock roof and the coal seam, have been defined and used to form a new criterion to determine the rock burst occurrence and type of rock burst. For the first longwall face at the No.8 mining area, Xin'an Coal Mine, the rock roof thickness is less than the transition thickness, the shear modulus is larger than the transition modulus, and the shearing strength is greater than the transition strength. Therefore, the igneous rock roof first breaks, and the roof fracture type rockburst occurs.
This paper aims to tackle the challenge of rock burst caused by igneous rock roof in coal mines. Based on the first longwall face of No.8 mining area at Xin'an Coal Mine, this research analyzed the impact of igneous rock intrusion on rockburst by using the roof shear beam model and considering the plasticity softening property of the coal seam. The results suggested that the roof thickness, shear modulus and shear strength have a critical impact on rockburst propensity. The deformation system of"the coal seam-igneous rock roof" may induce either the roof fracture type rockburst or the coal compression type rockburst, and the conditions for the occurrence of these two types rock bursts were proposed. The thickness, shear modulus and shear strength of a transitional layer, which is between the igneous rock roof and the coal seam, have been defined and used to form a new criterion to determine the rock burst occurrence and type of rock burst. For the first longwall face at the No.8 mining area, Xin'an Coal Mine, the rock roof thickness is less than the transition thickness, the shear modulus is larger than the transition modulus, and the shearing strength is greater than the transition strength. Therefore, the igneous rock roof first breaks, and the roof fracture type rockburst occurs.
引文
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[12]王义然,牟宗龙,阮国强.深井火成岩侵入工作面冲击矿压防治[J].煤矿开采,2010,15(6):77-79.WANG Yiran,MU Zonglong,RUAN Guoqiang.Rock-burst prevention and control of deep mining face influenced by intrusive igneous rock[J].Coal Mining Technology,2010,15(6):77-79.
[13]刘礼鹏,牟宗龙,窦林名,等.火成岩坚硬底板冲击矿压原因及防治[J].煤矿安全,2012,43(2):155-157.LIU Lipeng,MU Zonglong,DOU Linming,et al.Reasons and prevention measures for rock-burst in hard floor of igneous rock[J].Safety in Coal Mines,2012,43(2):155-157.
[14]詹振江,陆菜平.火成岩下工作面开采的冲击危险性评价与监测技术[J].煤矿开采,2012,17(3):83-85.ZHAN Zhenjiang,LU Caiping.Rock-burst danger evaluation and monitoring technology of mining under igneous rock[J].Coal Mining Technology,2012,17(3):83-85.
[15]罗吉安.巨厚火成岩下煤巷冲击地压机理及防治技术研究[D].徐州:中国矿业大学,2013.
[16]胡敏军,王连国,朱双双,等.巨厚火成岩诱发冲击矿压的原因与防治技术[J].矿业研究与开发,2013,33(6):54-57.HU Minjun,WANG Lianguo,ZHU Shuangshuang,et al.Reasons and prevention measures for rock burst caused by extremely thick igneous rock[J].Mining Research and Development,2013,33(6):54-57.
[17]梁继忠,张峰,张润兵.火成岩下开采的冲击监测与防治技术[J].煤矿安全,2013,44(6):91-93.LIANG Jizhong,ZHANG Feng,ZHANG Runbing.The impact monitoring and control technology of mining under igneous rock[J].Safety in Coal Mines,2013,44(6):91-93.
[18]张强.强冲击煤层火成岩侵入综放面冲击地压危险分析与防治[J].山东工业技术,2015(5):82.ZHANG Qiang.Risk analysis and prevention of rock burst in fully mechanized caving face of igneous rock intrusion in strong impact coal seam[J].Shandong Industrial Technology,2015(5):82.
[19]陆占金,曹建军,李思乾.厚硬火成岩诱发冲击矿压的原因研究[J].能源技术与管理,2015,40(4):10-12.LU Zhanjin,CAO Jianjun,LI Siqian.Study on the causes of impact rock pressure induced by thick and hard igneous rocks[J].Energy Technology and Management,2015,40(4):10-12.
[20]钱坤.厚硬火成岩下回采工作面的冲击矿压防治研究[J].中国煤炭,2017,43(5):60-65.QIAN Kun.Study on prevention and control of rock burst in mining face under thick hard igneous rock[J].China Coal,2017,43(5):60-65.
[2]冯国瑞,王贵文,王朋飞,等.石炭二叠系火成岩侵入区特厚煤层采区停采煤柱合理宽度研究[J].采矿与安全工程学报,2019,36(1):87-94.FENG Guorui,WANG Guiwen,WANG Pengfei,et al.Study on rational width of the end-mining coal pillar of extra-thick mining panel in permo-carboniferous igneous rock intrusion area[J].Journal of Mining&Safety Engineering,2019,36(1):87-94.
[3]刘树文,王伟,白翔,等.冀东-辽西太古宙火成岩岩石组合和动力学意义[J].地球科学,2018,43(1):44-56.LIU Shuwen,WANG Wei,BAI Xiang,et al.Lithological assemblages of archean meta-igneous rocks in eastern Hebei-western Liaoning provinces of north China craton and their Geodynamic implications[J].Earth Science,2018,43(1):44-56.
[4]刘海顺,井广成,谢龙,等.微震信号随能量的变化特征:以张小楼井为例[J].采矿与安全工程学报,2018,35(2):316-323.LIU Haishun,JING Guangcheng,XIE Long,et al.Variation of microseismic signal with energy:a case study of Zhangxiaolou coal mine[J].Journal of Mining&Safety Engineering,2018,35(2):316-323.
[5]杨增强,窦林名,刘畅,等.深井巷帮煤体冲击机理及水射流卸压技术应用[J].采矿与安全工程学报,2017,34(4):670-677,729.YANG Zengqiang,DOU Linming,LIU Chang,et al.Mechanism of rock burst in roadway side wall and the application of water jet pressure relief technology in deep mine[J].Journal of Mining&Safety Engineering,2017,34(4):670-677,729.
[6]王桂峰,窦林名,蔡武,等.冲击地压的不稳定能量触发机制研究[J].中国矿业大学学报,2018,47(1):190-196.WANG Guifeng,DOU Linming,CAI Wu,et al.Unstable energy triggering mechanism of rock burst[J].Journal of China University of Mining&Technology,2018,47(1):190-196.
[7]刘少虹,潘俊锋,王洪涛,等.基于地震波和电磁波CT联合探测的采掘巷道冲击危险性评价方法[J].煤炭学报,2018,43(11):2980-2991.LIU Shaohong,PAN Junfeng,WANG Hongtao,et al.Assessment of rock burst risk in roadway based on the combination of seismic and electromagnetic wave CTtechnology[J].Journal of China Coal Society,2018,43(11):2980-2991.
[8]刘少虹,潘俊锋,夏永学,等.基于地音与电磁波CT的掘进工作面冲击危险性层次化评价方法研究[J].煤炭学报,2018,43(8):2107-2116.LIU Shaohong,PAN Junfeng,XIA Yongxue,et al.Research on the risk hierarchical assessment of rock burst of heading face based on acoustic emission and electromagnetic wave CT system[J].Journal of China Coal Society,2018,43(8):2107-2116.
[9]陈凡,曹安业,窦林名,等.基于区域划分与主控因素辨识的冲击危险性评价方法[J].煤炭学报,2018,43(3):607-615.CHEN Fan,CAO Anye,DOU Linming,et al.Method of coal burst hazard assessment based on region division and identification of main impact factors[J].Journal of China Coal Society,2018,43(3):607-615.
[10]赵三俊.火成岩侵入煤层工作面支架支护强度的确定[J].山西煤炭管理干部学院学报,2016,29(4):35-36.ZHAO Sanjun.Determination of support strength of igneous rock intrusion coal seam face[J].Journal of Shanxi Coal-Mining Administrators College,2016,29(4):35-36.
[11]靳春华,潘一山,石强.王营煤矿火成岩型冲击矿压浅析[J].煤矿开采,2006,11(1):59-61.JIN Chunhua,PAN Yishan,SHI Qiang.Analysis of igneous rock burst in Wangying colliery[J].Coal Mining Technology,2006,11(1):59-61.
[12]王义然,牟宗龙,阮国强.深井火成岩侵入工作面冲击矿压防治[J].煤矿开采,2010,15(6):77-79.WANG Yiran,MU Zonglong,RUAN Guoqiang.Rock-burst prevention and control of deep mining face influenced by intrusive igneous rock[J].Coal Mining Technology,2010,15(6):77-79.
[13]刘礼鹏,牟宗龙,窦林名,等.火成岩坚硬底板冲击矿压原因及防治[J].煤矿安全,2012,43(2):155-157.LIU Lipeng,MU Zonglong,DOU Linming,et al.Reasons and prevention measures for rock-burst in hard floor of igneous rock[J].Safety in Coal Mines,2012,43(2):155-157.
[14]詹振江,陆菜平.火成岩下工作面开采的冲击危险性评价与监测技术[J].煤矿开采,2012,17(3):83-85.ZHAN Zhenjiang,LU Caiping.Rock-burst danger evaluation and monitoring technology of mining under igneous rock[J].Coal Mining Technology,2012,17(3):83-85.
[15]罗吉安.巨厚火成岩下煤巷冲击地压机理及防治技术研究[D].徐州:中国矿业大学,2013.
[16]胡敏军,王连国,朱双双,等.巨厚火成岩诱发冲击矿压的原因与防治技术[J].矿业研究与开发,2013,33(6):54-57.HU Minjun,WANG Lianguo,ZHU Shuangshuang,et al.Reasons and prevention measures for rock burst caused by extremely thick igneous rock[J].Mining Research and Development,2013,33(6):54-57.
[17]梁继忠,张峰,张润兵.火成岩下开采的冲击监测与防治技术[J].煤矿安全,2013,44(6):91-93.LIANG Jizhong,ZHANG Feng,ZHANG Runbing.The impact monitoring and control technology of mining under igneous rock[J].Safety in Coal Mines,2013,44(6):91-93.
[18]张强.强冲击煤层火成岩侵入综放面冲击地压危险分析与防治[J].山东工业技术,2015(5):82.ZHANG Qiang.Risk analysis and prevention of rock burst in fully mechanized caving face of igneous rock intrusion in strong impact coal seam[J].Shandong Industrial Technology,2015(5):82.
[19]陆占金,曹建军,李思乾.厚硬火成岩诱发冲击矿压的原因研究[J].能源技术与管理,2015,40(4):10-12.LU Zhanjin,CAO Jianjun,LI Siqian.Study on the causes of impact rock pressure induced by thick and hard igneous rocks[J].Energy Technology and Management,2015,40(4):10-12.
[20]钱坤.厚硬火成岩下回采工作面的冲击矿压防治研究[J].中国煤炭,2017,43(5):60-65.QIAN Kun.Study on prevention and control of rock burst in mining face under thick hard igneous rock[J].China Coal,2017,43(5):60-65.