煤岩受压过程中内部红外辐射温度变化特征研究
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摘要
在煤岩体内部钻Ф10mm的孔,首次利用红外测温仪实时测量煤岩体孔内的温度来得到其内部的温度变化特征.对煤和泥岩试件进行单轴加载红外观测试验,分析其受压过程中红外辐射温度的时空演化特征,发现煤内部温度与时间、载荷都是正相关的.煤样中出现破裂前兆是突然升温型,红外辐射温度由低速上升或者平稳状态转为高速上升,温度上升速度突然发生转折,温度突增最高达0.10℃.泥岩总体上都是升温形式,将升温泥岩孔内红外辐射温度与应力、应变线性拟合,得到孔内红外辐射温度与应力、应变的线性相关系数均大于0.92.泥岩中出现破裂前兆是突然升温型,最高突增0.23℃.
To study the variation characteristics of internal temperature of coal-rock mass in the compression process,we drilled a hole of Ф10 mm in coal-rock mass and measured the real-time temperature of the hole by the infrared thermometer.Infrared observation experiment of coal and mudstone under uniaxial loading was carried out in this study,and temporal and spatial evolution rule of infrared radiation temperature were also analyzed.The results show that the internal temperature of coal has a positive relationship with time and load.The sign of fracture appears in the coal samples,that is,temperature suddenly rises.Infrared radiation temperature shows a change from low-speed increase or stable state to high-speed increase,and increase speed of temperature suddenly changes,with a maximum increase of 0.10 ℃.On the whole,the mudstone shows an increase.Linear fitting the infrared radiation temperature,stress and strain in the hole of temperature-rising mudstone concludes that linear correlation coefficients of above three factors are all greater than 0.92.The sign of failure appears in mudstone,that is,temperature suddenly rises,with a maximum increment of 0.23 ℃.
To study the variation characteristics of internal temperature of coal-rock mass in the compression process,we drilled a hole of Ф10 mm in coal-rock mass and measured the real-time temperature of the hole by the infrared thermometer.Infrared observation experiment of coal and mudstone under uniaxial loading was carried out in this study,and temporal and spatial evolution rule of infrared radiation temperature were also analyzed.The results show that the internal temperature of coal has a positive relationship with time and load.The sign of fracture appears in the coal samples,that is,temperature suddenly rises.Infrared radiation temperature shows a change from low-speed increase or stable state to high-speed increase,and increase speed of temperature suddenly changes,with a maximum increase of 0.10 ℃.On the whole,the mudstone shows an increase.Linear fitting the infrared radiation temperature,stress and strain in the hole of temperature-rising mudstone concludes that linear correlation coefficients of above three factors are all greater than 0.92.The sign of failure appears in mudstone,that is,temperature suddenly rises,with a maximum increment of 0.23 ℃.
引文
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[2]崔承禹,邓明德,耿乃光,等.在不同压力下岩石光谱辐射特性研究[J].科学通报,1993,38(6):538-541.CUI Cheng-yu,DENG Ming-de,GENG Nai-guang,etal.Rock spectral radiation signatures under differentpressures[J].Chinese Sci Bull,1993,38(6):538-541.
[3]WU L X,WANG J Z.Features of infrared thermalimage and radiation temperature of coal rocks loaded[J].Science in China,1998,41(2):158-164.
[4]WU L X,CUI C Y,GENG N G,et al.Remote sensingrock mechanics(RSRM)and associated experimentalstudies[J].Int J Rock Mech&Min Sci,2000,37(6):879-888.
[5]刘善军,吴立新,吴焕萍,等.多暗色矿物类岩石单轴加载过程中红外辐射定量研究[J].岩石力学与工程学报,2002,21(11):1585-1589.LIU Shan-jun,WU Li-xin,WU Huan-ping,et al.Quantitative study on the thermal infrared radiationof dark mineral rock in condition of uniaxial loading[J].Chinese Journal of Rock Mechanics and Engi-neering,2002,21(11):1585-1589.
[6]刘善军,吴立新,吴育华,等.受载岩石红外辐射的影响因素及机理分析[J].矿山测量,2003(3):67-68.LIU Shan-jun,WU Li-xin,WU Yu-hua,et al.Analy-sis of affection factors of infrared radiation comingfrom loaded rocks[J].Mine Surveying,2003(3):67-68.
[7]FREUND F.On the electrical conductivity structureof the stable continental crust[J].Journal of Geody-namics,2003,35(3):353-388.
[8]刘善军,吴立新,张艳博.岩石破裂前红外热像的时空演化特征[J].东北大学学报:自然科学版,2009,30(7):1034-1038.LIU Shan-jun,WU Li-xin,ZHANG Yan-bo.Tempo-ral-spatial evolution features of infrared thermal ima-ges before rock failure[J].Journal of Northeastern U-niversity:Natural Science,2009,30(7):1034-1038.
[9]张艳博,刘善军.含孔岩石加载过程的热辐射温度场变化特征[J].岩土力学,2011,32(4):1013-1017.ZHANG Yan-bo,LIU Shan-jun.Thermal radiationtemperature field variation of hole rock in loadingprocess[J].Rock and Soil Mechanics,2011,32(4):1013-1017.
[10]刘力强,陈国强,刘培洵,等.岩石变形试验热红外观测系统[J].地震地质,2004,26(3),492-501.LIU Li-qiang,CHEN Guo-qiang,LIU Pei-xun,et al.Infrared measurement system for rock deformationexperiment[J].Seismology and Geology,2004,26(3):492-501.
[11]刘善军,吴立新.脆性岩石与有机玻璃受力红外辐射特征的比较[J].岩石力学与工程学报,2007,26(2):4183-4188.LIU Shan-jun,WU Li-xin.Comparison of infraredradiations of brittle rock and polymethyl mechacry-late induced by stress[J].Chinese Journal of RockMechanics and Engineering,2007,26(2):4183-4188.
[12]吴立新,刘善军,吴育华.遥感-岩石力学引论:岩石受力灾变的红外遥感[M].北京:科学出版社,2006.
[13]刘善军,吴立新,王川婴,等.遥感-岩石力学(VIII):论岩石破裂的热红外前兆[J].岩石力学与工程学报,2004,23(10):1621-1627.LIU Shan-jun,WU Li-xin,WANG Chuan-ying,etal.Remote sensing-rock mechanics(VIII):TIR o-mens of rock fracturing[J].Chinese Journal of RockMechanics and Engineering,2004,23(10):1621-1627.
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