考虑气体压力的三轴煤与瓦斯突出模拟实验
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摘要
为了深入探索煤与瓦斯突出演化规律及其孕灾机理,利用自主研发的基于气体驱动多场煤与瓦斯突出试验系统,进行了原煤在不同气体压力和不同应力条件下的煤与瓦斯突出试验,研究了煤样在突出后的损伤破坏特征。得到如下结论:煤样的突出破坏强度随气体压力的增大而增大,特别是气体压力超过临界值2.2 MPa时,会产生喷出煤粉的强烈突出现象;原煤突出后不仅有粉化的煤粉,还有大颗粒的煤和小煤块,从而出现封堵突出口、抑制突出的现象;在煤样没有发生喷出煤粉的强烈突出时,随着轴压或围压的增大,煤样突出破坏强度有减小的趋势;通过分析突出口气体压力的演化规律,可预判煤样突出破坏的程度。
In order to further explore the evolution law of coal and gas outburst and its pregnant catastrophe mechanism, the self-developed system of gas-driven multi-physics coal and gas outburst test is used to carry out the coal and gas outburst experiments of raw coal under different gas pressure and different stress. The damage characteristics of the coal sample after the outburst are studied. The conclusions are as follows: The intensity of outburst destruction of coal samples increases with the increase of gas pressure. Especially, when the gas pressure exceeds the critical value of 2.2 MPa, there will be a strong outburst of pulverized coal. In addition, there are large particles of coal and small coal blocks,which results in the block of the outlet and restrain of the outburst. When there is no strong outburst of pulverized coal, the intensity of outburst destruction of coal samples will tend to decrease with the axial pressure or confining pressure increasing. By analyzing the evolution law of gas pressure at the outburst cavern, the degree of outburst destruction of the coal sample can be prejudged.
In order to further explore the evolution law of coal and gas outburst and its pregnant catastrophe mechanism, the self-developed system of gas-driven multi-physics coal and gas outburst test is used to carry out the coal and gas outburst experiments of raw coal under different gas pressure and different stress. The damage characteristics of the coal sample after the outburst are studied. The conclusions are as follows: The intensity of outburst destruction of coal samples increases with the increase of gas pressure. Especially, when the gas pressure exceeds the critical value of 2.2 MPa, there will be a strong outburst of pulverized coal. In addition, there are large particles of coal and small coal blocks,which results in the block of the outlet and restrain of the outburst. When there is no strong outburst of pulverized coal, the intensity of outburst destruction of coal samples will tend to decrease with the axial pressure or confining pressure increasing. By analyzing the evolution law of gas pressure at the outburst cavern, the degree of outburst destruction of the coal sample can be prejudged.
引文
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[17]金洪伟.煤与瓦斯突出发展过程的实验与机理分析[J].煤炭学报,2012,37(增刊1):98-103.JIN Hongwei.Effect of adsorptional gases on permeability of outburst coal[J].Journal of China Coal Society,2012,37(Sup 1):98-103.
[18]TU Q,CHENG Y,GUO P,et al.Experimental study of coal and gas outbursts related to gas-enriched areas[J].Rock Mechanics&Rock Engineering,2016,49(9):1-13.
[19]GUAN Ping,WANG Haoyue,ZHANG Youxue.Mechanism of instantaneous coal outbursts[J].Geology,2009,37(10):915-918.
[20]WANG Shugang,ELSWORTH.Rapid decompression and desorption induced energetic failure in coal[J].Journal of Rock Mechanics and Geotechnical Engineering,2015,7(3):345-350.
[21]郑修麟.工程材料的力学行为[M].西安:西北工业大学出版社,2004:26-27.
[22]SHEPHERD J,RIXON L K,GRIFFITHS L.Outbursts and geological structures in coal mines:a review[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstract,1981,18(4):267-283.
[2]俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社,1992:79-90.
[3]于不凡.煤矿瓦斯灾害防治及利用技术手册(修订版)[M].北京:煤炭工业出版社,2005:508-559.
[4]霍多特B B.煤与瓦斯突出[M].宋士钊,王佑安,译.北京:中国工业出版社,1966:16-18.
[5]蒋承林,俞启香.煤与瓦斯突出过程中能量耗散规律的研究[J].煤炭学报,1996,21(2):173-178.JIANG Chenglin,YU Qixiang.Study on energy dissipation law of coal and gas outburst[J].Journal of China Coal Society,1996,21(2):173-178.
[6]唐春安,刘红元.石门揭煤突出过程的数值模拟研究[J].岩石力学与工程学报,2002,21(10):1467-1472.TANG Chun’an,LIU Hongyuan.Study of numerical simulation on outburst process of stone door exposed[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(10):1467-1472.
[7]KHODOT V V,KOGAN G L.Modeling gas bursts[J].Journal of Mining Science,1979,15(5):491-494.
[8]WOLD M B,CONNELL L D,CHOI S K.The role of spatial variability in coal seam parameters on gas outburst behaviour during coal mining[J].International Journal of Coal Geology,2008,75:1-14.
[9]NORBERT S.Laboratory study of the phenomenon of methane and coal outburst[J].International Journal of Rock Mechanics&Mining Sciences,2012,55:102-107.
[10]YIN Guangzhi,JIANG Changbao,WANG J G,et al.Anew experimental apparatus for coal and gas outburst simulation[J].Rock Mechanics and Rock Engineering,2016,49(5):2005-2013.
[11]许江,刘东,彭守建,等.不同突出口径条件下煤与瓦斯突出模拟试验研究[J].煤炭学报,2013,38(1):9-14.XU Jiang,LIU Dong,PENG Shoujian,et al.Coal and gas outburst analogous test under the different diameter of exposed coal seam surface[J].Journal of China Coal Society,2013,38(1):9-14.
[12]许江,耿加波,彭守建,等.不同含水率条件下煤与瓦斯突出的声发射特性[J].煤炭学报,2015,40(5):1047-1054.XU Jiang,GENG Jiabo,PENG Shoujian,et al.Acoustic emission characteristics of coal and gas outburst under different moisture contents[J].Journal of China Coal Society,2015,40(5):1047-1054.
[13]袁瑞甫,李怀珍.含瓦斯煤动态破坏模拟实验设备的研制与应用[J].煤炭学报,2013,38(增刊1):117-123.YUAN Ruifu,LI Huaizhen.Development and application of simulation test apparatus for gassy coal dynamic failure[J].Journal of China Coal Society,2013,38(Sup 1):117-123.
[14]刘健,刘泽功,高魁,等.构造带石门揭煤诱导突出的力学特性模拟及声发射响应[J].煤炭学报,2014,39(10):2022-2028.LIU Jian,LIU Zegong,GAO Kui,et al.Simulation experiment of mechanical characteristics and acoustic emission response during outburst induced by rock cross-cut coal uncovering in tectonic belt[J].Journal of China Coal Society,2014,39(10):2022-2028.
[15]蔡成功.煤与瓦斯突出三维模拟实验研究[J].煤炭学报,2004,29(1):66-69.CAI Chenggong.Experimental study on 3-D simulation of coal and gas outbursts[J].Journal of China Coal Society,2004,29(1):66-69.
[16]欧建春,王恩元,马国强,等.煤与瓦斯突出过程煤体破裂演化规律[J].煤炭学报,2012,37(6):978-983.OU Jianchun,WANG Enyuan,MA Guoqiang,et al.Coal rupture evolution law of coal and gas outburst process[J].Journal of China Coal Society,2012,37(6):978-983.
[17]金洪伟.煤与瓦斯突出发展过程的实验与机理分析[J].煤炭学报,2012,37(增刊1):98-103.JIN Hongwei.Effect of adsorptional gases on permeability of outburst coal[J].Journal of China Coal Society,2012,37(Sup 1):98-103.
[18]TU Q,CHENG Y,GUO P,et al.Experimental study of coal and gas outbursts related to gas-enriched areas[J].Rock Mechanics&Rock Engineering,2016,49(9):1-13.
[19]GUAN Ping,WANG Haoyue,ZHANG Youxue.Mechanism of instantaneous coal outbursts[J].Geology,2009,37(10):915-918.
[20]WANG Shugang,ELSWORTH.Rapid decompression and desorption induced energetic failure in coal[J].Journal of Rock Mechanics and Geotechnical Engineering,2015,7(3):345-350.
[21]郑修麟.工程材料的力学行为[M].西安:西北工业大学出版社,2004:26-27.
[22]SHEPHERD J,RIXON L K,GRIFFITHS L.Outbursts and geological structures in coal mines:a review[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstract,1981,18(4):267-283.