不同温度作用后煤体单轴压缩声发射特征
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摘要
为研究温度对煤体力学特性的影响规律,采用MTS-880试验系统和声发射检测系统对经过不同温度处理的煤体进行单轴压缩全过程声发射测试。结果表明,随着应力的增加,经不同温度处理的各组煤体的累积声发射数量也随之增加,而经不同温度处理的各组煤体所积累声发射存在明显差异,这主要是由于温度使得煤体内部结构发生变化所致。通过区别各组煤体不同时段的声发射特征,不同温度条件对煤体的破坏存在明显差异,随着温度的升高煤体应力-应变全过程中压密过程延长,煤体弹性模量和抗压强度在温度作用下先增后减,140℃时为最大值;而随着温度升高,声发射频率表现愈发离散,声发射振铃数与能量在80℃时达到最大值。实验结果可为探究热效应对煤体作用机理提供一定的理论依据。
In order to study the influence of temperature on coal properties,the MTS-880 test system and acoustic emission testing system were used to carry out the uniaxial compression test of coal body after different temperature treatment. The results show that with the increase of stress,the amount of cumulative acoustic emission of each coal body increases with different temperatures,and there is a significant difference in the acoustic emission from each coal body treated at different temperatures,which is mainly due to the change of the internal structure of the coal body. With the increase of temperature,the densifying process is extended during stress-strain process of coal,and the modulus of elasticity and the compressive strength of coal increase gradually,then decreases and reach the maximum at 140 ℃under the action of temperature. With the increase of temperature,the acoustic emission frequency is more discrete,and the number and energy of acoustic emission reaches the maximum at 80 ℃. The experimental results provide theoretical basis for exploring the mechanism of thermal effect on coal.
In order to study the influence of temperature on coal properties,the MTS-880 test system and acoustic emission testing system were used to carry out the uniaxial compression test of coal body after different temperature treatment. The results show that with the increase of stress,the amount of cumulative acoustic emission of each coal body increases with different temperatures,and there is a significant difference in the acoustic emission from each coal body treated at different temperatures,which is mainly due to the change of the internal structure of the coal body. With the increase of temperature,the densifying process is extended during stress-strain process of coal,and the modulus of elasticity and the compressive strength of coal increase gradually,then decreases and reach the maximum at 140 ℃under the action of temperature. With the increase of temperature,the acoustic emission frequency is more discrete,and the number and energy of acoustic emission reaches the maximum at 80 ℃. The experimental results provide theoretical basis for exploring the mechanism of thermal effect on coal.
引文
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[17]于艳梅,胡耀青,梁卫国,等.瘦煤热破裂规律显微CT试验[J].煤炭学报,2010(10):1696-1700.YU Yan-mei,HU Yao-qing,LIANG Wei-guo,et al. Micro-CT experimental research of lean coal thermal cracking laws[J]. Journal of China Coal Society,2010(10):1696-1700.
[18]左建平,谢和平,周宏伟,等.不同温度作用下砂岩热开裂的实验研究[J].地球物理学报,2007,50(4):1150-1155.ZUO Jian-ping,XIE He-ping,ZHOU Hong-wei,et al.Experimental research on thermal cracking of sandstone under different temperature[J]. Chinese Journal of Geophysics,2007,50(4):1150-1155.
[2]何满潮,谢和平,彭苏萍,等.深部开采岩体力学研究[J].岩石力学与工程学报,2005,24(16):2803-2813.HE Man-chao,XIE He-ping,PENG Su-ping,et al. Study on rock mechanics in deep mining engineering[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(16):2803-2813.
[3]郝宪杰,袁亮,卢志国,等.考虑煤体非线性弹性力学行为的弹塑性本构模型[J].煤炭学报,2017,42(4):896-901.HAO Xian-jie,YUAN Liang,LU Zhi-guo,et al. An elastic-plastic-soften constitutive model of coal considering its nonlinear elastic mechanical behavior[J]. Journal of China Coal Society,2017,42(4):896-901.
[4] R. Vidya Sagar,B. K. Raghu Prasad. A review of recent development in parametric based acoustic emission techniques applied to concrete structures[J]. Nondestructive Testing&Evaluation,2012,27(1):47-68.
[5] Kim J S,Lee K S,Cho W J,et al. A comparative evaluation of stress-strain and acoustic emission methods for quantitative damage assessments of brittle rock[J].Rock Mechanics&Rock Engineering,2015,48(2):495-508.
[6]李志梁,李树刚,林海飞,等.基于声发射特征的覆岩采动裂隙演化规律研究[J].西安科技大学学报,2017,37(2):159-163.LI Zhi-liang,LI Shu-gang,LIN Hai-fei,et al. Study of the dynamic evolution rules of mining fracture based on acoustic emission technique[J]. Journal of Xi’an University of Science and Technology,2017,37(2):159-163.
[7]苏承东,高保彬,南华,等.不同应力路径下煤样变形破坏过程声发射特征的试验研究[J].岩石力学与工程学报,2009,28(4):757-766.SU Cheng-dong,GAO Bao-bin,NAN Hua,et al. Experimental study on acoustic emission characteristics during deformation and failure processes of coal samples under different stress paths[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(4):757-766.
[8]左建平,裴建良,刘建锋,等.煤岩体破裂过程中声发射行为及时空演化机制[J].岩石力学与工程学报,2011,30(8):1564-1570.ZUO Jian-ping,PEI Jian-liang,LIU Jian-feng,et al. Investigation on acoustic mission behavior and its timespace evolution mechanism in failure process of coalrock combined body[J]. Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1564-1570.
[9]张朝鹏,张茹,张泽天,等.单轴受压煤岩声发射特征的层理效应试验研究[J].岩石力学与工程学报,2015,34(4):770-778.ZHANG Zhao-peng,ZHANG Ru,ZHANG Ze-tian,et al.Experimental research on effects of bedding plane on coal acoustic emission under uniaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(4):770-778.
[10] Manthei G. Characterization of acoustic emission sources in a rock salt specimen under triaxial compression[J].Bulletin of the Seismological Society of America,2005,95(5):1674-1700.
[11]纪洪广,卢翔.常规三轴压缩下花岗岩声发射特征及其主破裂前兆信息研究[J].岩石力学与工程学报,2015,34(4):694-702.JI Hong-guang,LU Xiang. Characteristics of acoustic emission and rock fracture precursors of granite under conventional triaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(4):694-702.
[12]宋义敏,邢同振,赵同彬,等.岩石单轴压缩变形场演化的声发射特征研究[J].岩石力学与工程学报,2017,36(3):534-542.SONG Yi-min,XING Tong-zhen,ZHAO Tong-bin,et al.Acoustic emission characteristics of deformation field development of rock under uniaxial loading[J]. Chinese Journal of Rock Mechanics and Engineering,2017,36(3):534-542.
[13]曾鹏,刘阳军,纪洪广,等.单轴压缩下粗砂岩临界破坏的多频段声发射耦合判据和前兆识别特征[J].岩土工程学报,2017,39(3):509-517.ZENG Peng,LIU Yang-jun,JI Hong-guang,et al. Coupling criteria and precursor identification characteristics of multi-band acoustic emission of gritstone fracture under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2017,39(3):509-517.
[14]郑虹,冯夏庭,陈祖煜.岩石力学室内试验ISRM建议方法的标准化和数字化[J].岩石力学与工程学报,2010,29(12):2456-2468.ZHENG Hong,FENG Xia-ting,CHEN Zu-yu. Standardization and digitization for ISRM suggested methods of rock mechanics laboratory tests[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(12):2456-2468.
[15]肖旸,王振平,马砺,等.煤自燃指标气体与特征温度的对应关系研究[J].煤炭科学技术,2008,36(6):47-51.XIAO Yang,WANG Zhen-ping,MA Li,et al. Research on correspondence relationship between coal spontaneous combustion index gas and feature temperature[J].Coal Science and Technology,2008,36(6):47-51.
[16]朱红青,郭艾东,屈丽娜.煤热动力学参数、特征温度与挥发分关系的试验研究[J].中国安全科学学报,2012,22(3):55-60.ZHU Hong-qing,GUO Ai-dong,QU Li-na. Experimental Study on the relationship among the coal kinetics parameters characteristic temperatures and volatile[J]. China Safety Science Journal,2012,22(3):55-60.
[17]于艳梅,胡耀青,梁卫国,等.瘦煤热破裂规律显微CT试验[J].煤炭学报,2010(10):1696-1700.YU Yan-mei,HU Yao-qing,LIANG Wei-guo,et al. Micro-CT experimental research of lean coal thermal cracking laws[J]. Journal of China Coal Society,2010(10):1696-1700.
[18]左建平,谢和平,周宏伟,等.不同温度作用下砂岩热开裂的实验研究[J].地球物理学报,2007,50(4):1150-1155.ZUO Jian-ping,XIE He-ping,ZHOU Hong-wei,et al.Experimental research on thermal cracking of sandstone under different temperature[J]. Chinese Journal of Geophysics,2007,50(4):1150-1155.