煤岩动力灾害能量机理的数值模拟
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摘要
根据煤岩固体变形能和瓦斯气体膨胀能,建立了煤岩动力灾害统一能量方程,在数值模拟软件FLAC3D中编写了能量计算模块,并考虑采动应力波动载和流固耦合的条件分析了不同瓦斯初始压力作用下巷道围岩的能量分布状态,解释了深部开采条件下在一些含瓦斯煤层中出现的兼具冲击地压和煤与瓦斯突出2种灾害特征的动力灾害现象。认为瓦斯的不同参与程度导致了不同的动力灾害显现特征,瓦斯参与动力灾害的程度可由瓦斯压力或瓦斯含量来表征;煤体中瓦斯压力存在一个临界范围,当瓦斯含量高于此临界值范围时,动力灾害以煤与瓦斯突出的特征为主,反之则以冲击地压的特征为主;在低瓦斯压力下,瓦斯膨胀能量也具有与煤岩体变形能相当的数量级,对含瓦斯煤层的冲击地压研究不可忽视瓦斯的作用。
Based on strain energy of coal or rock mass and expansion energy of methane,presented a unified energy equation for underground dynamic disaster analysis. Stress wave boundary condition added and fluid-stress coupling calculation applied,an numerical simulation model with energy calculation mode programmed in FLAC3D was set up to obtain energy distribution of roadway under different original methane pressures. Some deep dynamic phenomena with integrated characteristics of rock-burst and coal-and-methane burst was explained by the simulation results. The results indicate that different methane participation degrees result in different dynamic behaviors,methane participation degree may be represented by methane pressure or methane content; there is a critical range for methane pressure,when it is higher than the critical range,dynamic disaster takes on coal and methane burst’s characteristic,otherwise it takes on rock-burst’s characteristic; even under low methane pressure,methane expansion energy is equivalent to strain energy of coal or rock mass in order of magnitude,so methane can’t be ignored in researching rock-burst in coal seam with methane.
Based on strain energy of coal or rock mass and expansion energy of methane,presented a unified energy equation for underground dynamic disaster analysis. Stress wave boundary condition added and fluid-stress coupling calculation applied,an numerical simulation model with energy calculation mode programmed in FLAC3D was set up to obtain energy distribution of roadway under different original methane pressures. Some deep dynamic phenomena with integrated characteristics of rock-burst and coal-and-methane burst was explained by the simulation results. The results indicate that different methane participation degrees result in different dynamic behaviors,methane participation degree may be represented by methane pressure or methane content; there is a critical range for methane pressure,when it is higher than the critical range,dynamic disaster takes on coal and methane burst’s characteristic,otherwise it takes on rock-burst’s characteristic; even under low methane pressure,methane expansion energy is equivalent to strain energy of coal or rock mass in order of magnitude,so methane can’t be ignored in researching rock-burst in coal seam with methane.
引文
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[12]王淑坤,李首滨,毛德兵.我国煤岩冲击倾向研究的进展[A].2000高效洁净开采与支护技术研讨会论文集[C].北京:煤炭工业出版社,2000.
[13]钱鸣高,刘听成.矿山压力及其控制[M].北京:煤炭工业出版社,1991.
[14]朱连山.关于煤层中的瓦斯膨胀能[J].煤矿安全,1985,16(2):47-50,38.Zhu Lianshan.Gas expansion energy in coal seam[J].Safety in Coal Mines,1985,16(2):4750,38.
[15]刘明举,颜爱华.煤与瓦斯突出的热动力过程分析[J].焦作工学院学报(自然科学版),2001,20(1):1-7.Liu Mingju,Yan Aihua.Themodynamic process analysis of coal and gas outbursts[J].Journal of Jiaozuo Institute of Technology,2001,20(1):17.
[2]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):5961.
[3]李忠华,潘一山,纪海汛,等.瓦斯煤层冲击地压防治技术及应用[M].北京:国防工业出版社,2009.
[4]李永杰,陈喜恩,王唐龙,等.平煤集团十二矿三水平冲击矿压原因分析及防治对策[J].煤矿安全,2007,38(4):33-35.Li Yongjie,Chen Xien,Wang Tanglong,et al.Reasons analysis and controlling countermeasure of rock burst in3level of No.12Mine in Pingdingshan Coal Group[J].Safety in Coal Mines,2007,38(4):3335.
[5]肖斌,谢友友,董涛,等.平煤十二矿冲击地压危险性研究[J].江西煤炭科技,2008(1):81-83.Xiao Bin,Xie Youyou,Dong Tao,et al.Study on hazard of pressure bump in No.12Colliery of Pingdingshan Mining Bureau[J].Jiangxi Coal Science&Technology,2008(1):8183.
[6]佩图霍夫ИМ.煤矿冲击地压[M].北京:煤炭工业出版社,1980.
[7]李铁,蔡美峰,王金安,等.深部开采冲击地压与瓦斯的相关性探讨[J].煤炭学报,2005,30(5):562-567.Li Tie,Cai Meifeng,Wang Jinan,et al.Discussion on relativity bwt-ween rockburst and gas in deep exploitation[J].Journal of China Coal Society,2005,30(5):562567.
[8]李世愚,和雪松,潘科,等.矿山地震、瓦斯突出及其相关性[J].煤炭学报,2006,31(S):11-18.Li Shiyu,He Xuesong,Pan Ke,et al.Relationship between mining seismicity and gas outburst in coal mine[J].Journal of China Coal Society,2006,31(S):1118.
[9]齐庆新,史元伟,刘天泉.冲击地压粘滑失稳机理的实验研究[J].煤炭学报,1997,22(2):144-148.Qi Qingxin,Shi Yuanwei,Liu Tianquan.Mechanism of instability caused by viscous sliding in rock burst[J].Journal of China Coal Society,1997,22(2):144148.
[10]郭德勇,韩德馨.煤与瓦斯突出粘滑机理研究[J].煤炭学报,2003,28(6):598602.Guo Deyong,Han Dexin.The stick-slip mechanism of coal and gas outburst[J].Journal of China Coal Society,2003,28(6):598-602.
[11]章梦涛,徐曾和,潘一山,等.冲击地压和突出的统一失稳理论[J].煤炭学报,1991,16(4):48-52.Zhang Mengtao,Xu Zenghe,Pan Yishan,et al.A united instability theory on coal(rock)burst and outburst[J].Journal of China Coal Society,1991,16(4):4852.
[12]王淑坤,李首滨,毛德兵.我国煤岩冲击倾向研究的进展[A].2000高效洁净开采与支护技术研讨会论文集[C].北京:煤炭工业出版社,2000.
[13]钱鸣高,刘听成.矿山压力及其控制[M].北京:煤炭工业出版社,1991.
[14]朱连山.关于煤层中的瓦斯膨胀能[J].煤矿安全,1985,16(2):47-50,38.Zhu Lianshan.Gas expansion energy in coal seam[J].Safety in Coal Mines,1985,16(2):4750,38.
[15]刘明举,颜爱华.煤与瓦斯突出的热动力过程分析[J].焦作工学院学报(自然科学版),2001,20(1):1-7.Liu Mingju,Yan Aihua.Themodynamic process analysis of coal and gas outbursts[J].Journal of Jiaozuo Institute of Technology,2001,20(1):17.
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