煤破坏过程中的温度演化特征实验研究
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摘要
以红外热像仪和数字散斑相关方法作为试验观测手段,对一种煤试件进行实验研究,观测和分析煤试件从变形到破坏过程中的变形演化、温度演化及二者的对应变化关系。研究结果表明:(1)煤试件变形场演化主要体现为初期的均匀变形演化到加载峰值前的变形集中带形成,加载峰后阶段主要为变形集中带的加速滑动;(2)煤试件温度场演化在加载峰前由于受压应力作用,内部质点间距发生改变的热力耦合效应引起温度上升,在加载峰后阶段由于变形集中带内煤体受拉剪作用及变形集中带的滑动,引起温度降低;(3)煤试件在变形破坏过程中存在明显的温度场变化,且变形集中带内、外温度演化特征相似,加载峰前阶段温度增加,加载峰后阶段温度降低,但变形集中带内温度总体高于带外温度。
The evolution characteristics of deformation fields and temperature fields are inspected and analyzed by using the digital speckle correlation method and infrared thermal imager.The test material is a kind of coal and the specimens are loaded by uniaxial test machine.The analytical results show that:(1) The deformation field evolution of coal specimen is divided into two phases:initial uniform deformation evolution to deformation localization at pre-peak loading stage,and deformation concentration in the localization band at post-peak loading stage.(2) The temperature evolution of coal specimen is divided into two phases:temperature rises due to internal particle spacing change caused by thermo-mechanical coupling effect at pre-peak loading stage;temperature decreases due to the tensile-shear effect and the sliding effect of deformation localization band at post-peak loading stage.(3) The temperature change is obvious in the deformation and destruction process of coal specimens;and the temperature evolution characteristics are similar inside and outside the deformation concentration band.The temperature increases at pre-peak loading stage and decreases at post-peak loading stage.The temperature inside the deformation localization band is higher than that outside the deformation localization band.
The evolution characteristics of deformation fields and temperature fields are inspected and analyzed by using the digital speckle correlation method and infrared thermal imager.The test material is a kind of coal and the specimens are loaded by uniaxial test machine.The analytical results show that:(1) The deformation field evolution of coal specimen is divided into two phases:initial uniform deformation evolution to deformation localization at pre-peak loading stage,and deformation concentration in the localization band at post-peak loading stage.(2) The temperature evolution of coal specimen is divided into two phases:temperature rises due to internal particle spacing change caused by thermo-mechanical coupling effect at pre-peak loading stage;temperature decreases due to the tensile-shear effect and the sliding effect of deformation localization band at post-peak loading stage.(3) The temperature change is obvious in the deformation and destruction process of coal specimens;and the temperature evolution characteristics are similar inside and outside the deformation concentration band.The temperature increases at pre-peak loading stage and decreases at post-peak loading stage.The temperature inside the deformation localization band is higher than that outside the deformation localization band.
引文
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[14]宋义敏,马少鹏,杨小彬,等.断层黏滑动态变形过程的实验研究[J].地球物理学报,2012,55(1):171–179.(SONGYimin,MAShaopeng,YANG Xiaobin,et al.Experimental study on the dynamicdisplacement evolution of fault in stick-slip process[J].ChineseJournal of Geophysics,2012,55(1):171–179.(in Chinese))
[15]宋义敏,马少鹏,杨小彬,等.岩石变形破坏的数字散斑相关方法研究[J].岩石力学与工程学报,2011,30(1):170–175.(SONGYimin,MA Shaopeng,YANG Xiaobin,et al.Experimental investigationon failure of rock by digital speckle correlation methods[J].ChineseJournal of Rock Mechanics and Engineering,2011,30(1):170–175.(in Chinese))
[2]谭云亮,王学水.煤矿坚硬顶板活动过程中声发射特征的初步研究[J].岩石力学与工程学报,1992,11(3):211–217.(TAN Yunliang,WANG Xueshui.A preliminary study of acoustic emission of rockduring the roof weighting process in a coal mine[J].Chinese Journal ofRock Mechanics and Engineering,1992,11(3):211–217.(in Chinese))
[3]李俊平,周创兵.岩体的声发射特征试验研究[J].岩土力学,2004,25(3):374–378.(LI Junping,ZHOU Chuangbing.Experimentalresearch on acoustic emission characteristics of rock mass[J].Rockand Soil Mechanics,2004,25(3):374–378.(in Chinese))
[4]刘力强,陈国强,刘培洵,等.岩石变形实验热红外观测系统[J].地震地质,2004,26(3):492–500.(LIU Liqiang,CHEN Guoqiang,LIU Peixun,et al.Infrared measurement system for rock deformationexperiment[J].Seismology and Geology,2004,26(3):492–500.(in Chinese))
[5]窦林名,何学秋,王恩元,等.由煤岩变形冲击破坏所产生的电磁辐射[J].清华大学学报:自然科学版,2001,41(12):86–88.(DOULinming,HE Xueqiu,WANG Enyuan,et al.Electromagneticemissions in rock and coal burst failures[J].Journal of TsinghuaUniversity:Science and Technology,2001,41(12):86–88.(in Chinese))
[6]姜耀东,吕玉凯,赵毅鑫,等.煤样失稳破坏的多参量监测试验[J].岩石力学与工程学报,2012,31(4):667–674.(JIANG Yaodong,LU Yukai,ZHAO Yixin,et al.Multiparameter monitoring experimentsfor instability destruction of coal samples[J].Chinese Journal of RockMechanics and Engineering,2012,31(4):667–674.(in Chinese))
[7]耿乃光,崔承禹,邓明德.岩石破裂实验中的遥感观测与遥感岩石力学的开端[J].地震学报,1992,14(增1):645–652.(GENGNaiguang,CUI Chengyu,DENG Mingde.Rock fracture experiment inthe remote sensing observation and the threshold of remote sensingrock mechanics[J].Acta Seismologica Sinica,1992,14(Supp.1):645–652.(in Chinese))
[8]WU L X,WANG J Z.Features of infrared thermal image andradiation temperature of coal rocks loaded[J].Science in China SeriesD,1998,41(2):158–164.
[9]王来贵,李建新,赵娜,等.岩石工程系统破坏的弱场控制探讨[J].辽宁工程技术大学学报,2005,24(5):671–673.(WANGLaigui,LI Jianxin,ZHAO Na,et al.Research on weak-field controlof rock engineering system failure[J].Journal of Liaoning TechnicalUniversity,2005,24(5):671–673.(in Chinese))
[10]董玉芬,于波,郝凤山,等.煤变形破裂过程中红外信息的试验研究[J].实验力学,2002,17(2):206–211.(DONG Yufen,YU Bo,HAO Fengshan,et al.An experimental research on the infraredradiation in coal rupture[J].Journal of Experimental Mechanics,2002,17(2):206–211.(in Chinese))
[11]董玉芬,王来贵,刘向峰,等.岩石变形过程中红外辐射的实验研究[J].岩土力学,2001,22(2):134–137.(DONG Yufen,WANGLaigui,LIU Xiangfeng,et al.The experimental research of theinfrared radiation in the process of rock deformation[J].Rock and SoilMechanics,2001,22(2):134–137.(in Chinese))
[12]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):1621–1 627.(LIU Shanjun,WU Lixin,WANG Chuanying,et al.Remotesensing-rock mechanics(VIII)—thermal infrared omens of rock fracturing[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(10):1 621–1 627.(in Chinese))
[13]崔承禹,邓明德,耿乃光.在不同压力下岩石光谱辐射特性的研究[J].科学通报,1993,38(6):538–541.(CUI Chengyu,DENG Mingde,GENG Naiguang.Study on the features of spectrum radiation of rocksunder different loads[J].Chinese Science Bulletin,1993,38(6):538–541.(in Chinese))
[14]宋义敏,马少鹏,杨小彬,等.断层黏滑动态变形过程的实验研究[J].地球物理学报,2012,55(1):171–179.(SONGYimin,MAShaopeng,YANG Xiaobin,et al.Experimental study on the dynamicdisplacement evolution of fault in stick-slip process[J].ChineseJournal of Geophysics,2012,55(1):171–179.(in Chinese))
[15]宋义敏,马少鹏,杨小彬,等.岩石变形破坏的数字散斑相关方法研究[J].岩石力学与工程学报,2011,30(1):170–175.(SONGYimin,MA Shaopeng,YANG Xiaobin,et al.Experimental investigationon failure of rock by digital speckle correlation methods[J].ChineseJournal of Rock Mechanics and Engineering,2011,30(1):170–175.(in Chinese))
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