含瓦斯煤体破坏过程中AE序列关联维数演化分析
摘要
利用分形理论对无瓦斯和含瓦斯煤体失稳破坏中的声发射序列关联维数演化特征进行了分析。结果表明,单轴载荷条件下煤体的声发射时间序列在各变形阶段具有明显的分形特征,各变形阶段的声发射过程具有不同的自相似性,其关联维数可描述煤样力学状态;三轴加载过程中,无瓦斯和含瓦斯煤样的声发射时间序列随应力水平的变化趋势和声发射关联维数变化趋势相似;弹性阶段后,煤样的声发射时间序列关联维数的突降,可以作为破坏的"前兆",这一特征不随围压变化、瓦斯压力的存在与否而发生变化。
The correlation dimension evolution characteristics of acoustic emission(AE) time-series during the instability and failure of coal with and without gas are analyzed base on fractal theory.The results show the coal rock's AE time-series of deformation stages have obviously fractal characteristics under uniaxial loading.The processes of AE of deformation have different self-similarity,and the correlation dimension can describe the mechanical state of coal.During the triaxial loading process,the stress-varying trend of AE time-series of coal with and without gas is similar to the trend of AE correlation dimension.The sharp decrease of AE time-series' correlation dimension can be considered as a "precursor" for failure.This feature doesn't change with the change of confining pressure and gas pressure.
The correlation dimension evolution characteristics of acoustic emission(AE) time-series during the instability and failure of coal with and without gas are analyzed base on fractal theory.The results show the coal rock's AE time-series of deformation stages have obviously fractal characteristics under uniaxial loading.The processes of AE of deformation have different self-similarity,and the correlation dimension can describe the mechanical state of coal.During the triaxial loading process,the stress-varying trend of AE time-series of coal with and without gas is similar to the trend of AE correlation dimension.The sharp decrease of AE time-series' correlation dimension can be considered as a "precursor" for failure.This feature doesn't change with the change of confining pressure and gas pressure.
引文
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[21]曹树刚,刘延保,李勇,等.不同围压下煤岩声发射特征试验[J].重庆大学学报,2009,32(11):1321-1327.CAO SHU-GANG,LIU YAN-BAO,LI YONG,et al.Experimental study on acoustic emission characteristicsof coal rock at different confining pressure[J].Journalof Chongqing University,2009,32(11):1321-1327.
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[2]纪洪广.混凝土材料声发射性能研究与应用[M].北京:煤炭工业出版社,2004.
[3]YANAGIDANI T,EHARA S,NISHIZAWA O,et al.Localization of dilatancy in Ohshima graniteunder constant uniaxial stress[J].J Geophys Res,1985,90(B8):6840-6858.
[4]KUSUNOSE K,NISHIZAWA O.AE gap prior tolocal fracture of rock under uniaxial compression[J].JPhy Earth,1986,34(suppl1):45-56.
[5]HIRATA T,SATOH T,ITO K.Fracture structure ofspatial distribution of microfacturing in rock[J].Geophysical Journal of the Royal Astronomical Society,1987,90(2):368-374.
[6]安镇文,姚栋华,陈颙.岩石声发射和地震活动的信息维特征[J].中国科学:B辑,1992,22(7):736-742.AN ZHEN-WEN,YAO DONG-HUA,CHEN-YU.The information dimensional Characteristic of acousticemission and seismic activities[J].Science in China:Ser.B,1992,22(7):736-742.
[7]雷兴林,马瑾,楠濑勤一郎,等.三轴压缩下粗晶花岗岩声发射三维分布及其分形特征[J].地震地质,1991,13(2):92-106.LEI XING-LIN,MA JIN,KUSUNOSE KINICHIRO,et al.The three-dimensional distribution of acousticemission and fractal characteristics of coarse-grainedgranite under triaxial compression[J].Seismology andGeology,1991,13(2):92-106.
[8]FENG XIA-TING,SETO M.Fractal structure of thetime distribution of microfracturing in rocks[J].Geophysical Journal International,1999,136(1):275-285.
[9]冯夏庭,赖户政宏.化学环境侵蚀下的岩石破裂特性:第一部分:试验研究[J].岩石力学与工程学报,2000,19(4):403-407.FENG XIA-TING,MASAHIRO SETO.Rockfracturing behaviors under chemical corrosion:PartⅠ:Experimental study[J].Chinese Journal of RockMechanics and Engineering,2000,19(4):403-407.
[10]王泳嘉,冯夏庭.化学环境侵蚀下的岩石破裂特性:第二部分:时间分形分析[J].岩石力学与工程学报,2000,19(5):551-556.WANG YONG-JIA,FENG XIA-TING.Rockfracturing behaviors under chemical corrosion:PartⅡ:Temporal fractal analysis[J].Chinese Journal of RockMechanics and Engineering,2000,19(5):551-556.
[11]高峰,李建军,李肖音,等.岩石声发射特征的分形分析[J].武汉理工大学学报,2005,27(7):67-69.GAO FENG,LI JIAN-JUN,LI XIAO-YIN,et al.Fractal analysis of the characteristics of acousticemission of rock[J].Journal of Wuhan University ofTechnology,2005,27(7):67-69.
[12]尹贤刚,李庶林,唐海燕,等.岩石破坏声发射平静期及其分形特征研究[J].岩石力学与工程学报,2009,28(增2):3383-3390.YIN XIAN-GANG,LI SHU-LIN,TANG HAI-YAN,et al.Study on quiet period and its fractalcharacteristics of rock failure acoustic emission[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(suppl2):3383-3390.
[13]黄滚.岩石断裂失稳破坏与冲击地压的分叉和混沌特征研究[D].重庆:重庆大学,2007.
[14]李树春.周期荷载作用下岩石变形与损伤规律及其非线性特征[D].重庆:重庆大学,2008.
[15]SHKURATNIK V L,FILIMONOV Y L,KUCHURIN SV.Experimental investigations into acoustic emission incoal samples under uniaxial loading[J].Journal of MiningScience,2004,40(5):458-464.
[16]SHKURATNIK V L,KUCHURIN S V,FILIMONOV Y L.Regularities of acoustic emissionand thermoemission memory effect in coal specimensunder varying thermal conditions[J].Journal of MiningScience,2007,43(4):394-403.
[17]KUCHURIN S V,SHKURATNIK V L,VINNIKOVV A.Regularities of influence of disturbances onthermal emission memory in coal specimens[J].Journalof Mining Science,2008,44(2):131-137.
[18]MEHIC M,RANJITH P G,CHOI S K,et al.Thegeomechanical behavior of Australian black coal underthe effects of CO2injection:Uniaxial testing[C]∥Proceedings of the GeoShanghai Conference,June 6-8,2006,Shanghai,China.[S.1]:American Society ofCivil Engineers,2006:290-297.
[19]曹树刚,刘延保,张立强.突出煤体变形破坏声发射特征的综合分析[J].岩石力学与工程学报,2007,26(增1):2794-2799.CAO SHU-GANG,LIU YAN-BAO,ZHANG LI-QIANG.Study on characteristics of acoustic emissionin outburst coal[J].Chinese Journal of Rock Mechanicsand Engineering,2007,26(suppl1):2794-2799.
[20]曹树刚,刘延保,张立强,等.突出煤体单轴压缩和蠕变状态下的声发射对比试验[J].煤炭学报,2007,32(12):1264-1268.CAO SHU-GANG,LIU YAN-BAO,ZHANG LI-QIANG,et al.Experimental on acoustic emission ofoutburst-hazardous coal under uniaxial compression andcreep[J].Journal of China Coal Society,2007,32(12):1264-1268.
[21]曹树刚,刘延保,李勇,等.不同围压下煤岩声发射特征试验[J].重庆大学学报,2009,32(11):1321-1327.CAO SHU-GANG,LIU YAN-BAO,LI YONG,et al.Experimental study on acoustic emission characteristicsof coal rock at different confining pressure[J].Journalof Chongqing University,2009,32(11):1321-1327.
[22]谭云亮,刘传孝,赵同彬.岩石非线性动力学初论[M].北京:煤炭工业出版社,2008
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