煤与瓦斯突出中单个煤壳解体突出的突变理论分析
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摘要
在煤与瓦斯突出中,煤体自组织地形成最具抗力的球盖壳形式来抵抗被突出,煤壳一旦解体便丧失承载能力,高位势煤岩系统中与单个煤壳突出相应的各种能量得以释放。根据反映煤岩破坏特性的塑性变形局部化理论,导得突出前煤壳形变、位移时相应于偏应力的功、能增量关系,建立了煤壳失稳解体的突变模型,并对由于偏应力作用导致煤壳失稳解体机制进行了研究,给出失稳瞬间释放的偏应力应变能表达式、煤岩系统体积应变能释放量表达式和孔隙瓦斯粉碎解体后的碎煤及与煤层瓦斯渗流形成瓦斯-煤粉两相流描述。所得结果可深化对煤、地应力与瓦斯压力三因素对煤与突出演化规律综合作用的认识。
In process of coal-gas outburst, the coal mass forms a spherical shell itself which is the best form to resist outburst. Once the coal shell disintegrates, it loses carrying capacity; and in the high-potential coal-rock system, all kinds of energy corresponding to the outburst of a single coal shell are released immediately. According to the theory of plastic deformation localization which reflects the destruction characteristics of coal-rock, the equilibrium relationship of work and energy increments corresponding to deviatoric stress while coal shell deforms is educed; and the catastrophe model of destabilization and disintegration of coal shell is established. The mechanism of coal shell disintegration due to deviatoric stress is studied; the expressions of deviatoric strain energy at the destabilization moment, volumetric strain energy releasing amount are educed. The description of crushed coal and gas seepage form two-phase flow of gas-coal after porous gas outburst is given. The obtained analysis result can deepen the acquaintance with the combined action of three factors (coal, geostress and gas pressure) on coal-gas outburst.
In process of coal-gas outburst, the coal mass forms a spherical shell itself which is the best form to resist outburst. Once the coal shell disintegrates, it loses carrying capacity; and in the high-potential coal-rock system, all kinds of energy corresponding to the outburst of a single coal shell are released immediately. According to the theory of plastic deformation localization which reflects the destruction characteristics of coal-rock, the equilibrium relationship of work and energy increments corresponding to deviatoric stress while coal shell deforms is educed; and the catastrophe model of destabilization and disintegration of coal shell is established. The mechanism of coal shell disintegration due to deviatoric stress is studied; the expressions of deviatoric strain energy at the destabilization moment, volumetric strain energy releasing amount are educed. The description of crushed coal and gas seepage form two-phase flow of gas-coal after porous gas outburst is given. The obtained analysis result can deepen the acquaintance with the combined action of three factors (coal, geostress and gas pressure) on coal-gas outburst.
引文
[1]朱兴珊.特大型煤与瓦斯突出的地质条件及其成因[J].中国安全科学学报,1997,7(6):18-24ZHU Xing-shan.Geological conditions and cause of formation of the especially big coal and gas outburst[J].China Safety Science Journal,1997,7(6):18-24.
[2]蒋承林.煤与瓦斯突出阵面的推进过程及力学条件分析[J].中国矿业大学学报,1994,23(4):1-9.JIANG Cheng-lin.Analyses of the developing process and mechanical conditions of coal gas outburst front[J].Journal of China University of Mining&Technology,1994,23(4):1-9.
[3]蒋承林,候世松,李磊.突出矿井的鉴定指标新探[J].煤矿安全,2006,37(6):47-49.JIANG Cheng-lin,HOU Shi-song,LI Lei.Probing into identification index of outburst mine[J].Safety in Coal Mines,2006,37(6):47-49.
[4]潘岳,张勇,王志强.煤岩突出中单个煤壳突出前兆阶段的能量分析[J].岩土力学,2008,29(6):1500-1506.PAN Yue,ZHANG Yong,WANG Zhi-qiang.Energy analysis for premonitory phase of outburst of a single coal shell in coal-rock outburst[J].Rock and Soil Mechanics,2008,29(6):1500-1506.
[5]贾乃文.粘塑性力学及工程应用[M].北京:地震出版社,2000:51-52.
[6]VARDOULAKIS I.A gradient flow theory of plasticity for granular materials[J].Acta Mechenica,1991,87:197-217.
[7]凌复华.突变理论-历史、现状和展望[J].力学进展,1984,14(4):389-403.LING Fu-hua.History,present and advances of the catastrophe theory[J].Advances in Mechanics,1984,14(4):389-403.
[8]JEGER J C,COOK G W.Fundamentals of rock mechanics[M].London:Chapman and Hall Press,1979:466-470.
[9]程五一,刘晓会,王魁军.煤与瓦斯突出冲击波阵面的传播规律的研究[J].煤炭学报,2004,29(1):57-60.CHENG Wu-yi,LIU Xiao-yu,WANG Kui-jun.Study on regulation about shock-wave-front propagating for coal and gas outburst[J].Journal of China Coal Society,2004,29(1):57-60.
[2]蒋承林.煤与瓦斯突出阵面的推进过程及力学条件分析[J].中国矿业大学学报,1994,23(4):1-9.JIANG Cheng-lin.Analyses of the developing process and mechanical conditions of coal gas outburst front[J].Journal of China University of Mining&Technology,1994,23(4):1-9.
[3]蒋承林,候世松,李磊.突出矿井的鉴定指标新探[J].煤矿安全,2006,37(6):47-49.JIANG Cheng-lin,HOU Shi-song,LI Lei.Probing into identification index of outburst mine[J].Safety in Coal Mines,2006,37(6):47-49.
[4]潘岳,张勇,王志强.煤岩突出中单个煤壳突出前兆阶段的能量分析[J].岩土力学,2008,29(6):1500-1506.PAN Yue,ZHANG Yong,WANG Zhi-qiang.Energy analysis for premonitory phase of outburst of a single coal shell in coal-rock outburst[J].Rock and Soil Mechanics,2008,29(6):1500-1506.
[5]贾乃文.粘塑性力学及工程应用[M].北京:地震出版社,2000:51-52.
[6]VARDOULAKIS I.A gradient flow theory of plasticity for granular materials[J].Acta Mechenica,1991,87:197-217.
[7]凌复华.突变理论-历史、现状和展望[J].力学进展,1984,14(4):389-403.LING Fu-hua.History,present and advances of the catastrophe theory[J].Advances in Mechanics,1984,14(4):389-403.
[8]JEGER J C,COOK G W.Fundamentals of rock mechanics[M].London:Chapman and Hall Press,1979:466-470.
[9]程五一,刘晓会,王魁军.煤与瓦斯突出冲击波阵面的传播规律的研究[J].煤炭学报,2004,29(1):57-60.CHENG Wu-yi,LIU Xiao-yu,WANG Kui-jun.Study on regulation about shock-wave-front propagating for coal and gas outburst[J].Journal of China Coal Society,2004,29(1):57-60.
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