重庆大学学报2018，Vol.41Issue(2)：78-86,9.DOI:10.11835/j.issn.1000-582X.2018.02.010
页岩声发射RA值及其分形特征的试验研究
Laboratory study on RA value fractal feature of shale acoustic emission under conventional triaxial compression
摘要
Abstract
Shale acoustic emission test is conducted under the condition of conventional triaxial compression,and the time series of acoustic emission RA value is obtained.In order to study the micro mechanism and fractal feature in the process of shale destruction under the condition of conventional triaxial compression,the coupling relationship between fractal dimension and time is obtained and analyzed with using the calculation of correlation dimension of time series on MATLAB software.Results show:1)Crack in the process of shale destruction is the combination of tensile crack and shear crack,and shear crack is the main crack.Moreover,tensile cracks mainly appear at the peak strength,and the number of tensile crack is significantly reduced with the increase of confining pressure.2)The RA value of shale acoustic emission has self-similarity characteristics and fractal feature in the time domain.The evolutionary pattern of fractal dimension is:rise-sudden drop-fluctuation.3)The fractal dimension rises in the first stage,indicating that in rock interior tiny cracks first disorderly extend until fracture surfaces form.Then the fracture dimension suddenly decreases,suggesting the fracture surfaces extend and macro cracks form,and the rock is about to break.Therefore,the first sudden decrease of fractal dimension can be taken as the premonition of rock destruction.关键词
声发射/围压/页岩/声发射RA值/分形特征Key words
acoustic emission/confining pressure/shale/acoustic emission RA value/fractal feature分类
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顾义磊,王泽鹏,李清淼,房局,廖帅..页岩声发射RA值及其分形特征的试验研究[J].重庆大学学报,2018,41(2):78-86,9.基金项目
煤矿灾害动力学与控制国家重点实验室自主研究资助项目(2011DA105287-MS201303) （2011DA105287-MS201303）
十三五国家重点研发计划项目资助 (2016YFC0801402 （）
2016YFC0801404 ) （）
十三五国家科技重大专项 (2016ZX05045004 （）
2016ZX05043005) （）
国家自然科学基金面上项目(51674050).Supported by Independent Research Funding Project of Coal Mine Disaster Dynamics and Control State Key Laboratory(2011DA105287-MS201303),National Keypoint Research and Invention Program in 13th Five-Year (2016YFC0801402 （51674050）
2016YFC0801404),National Keypoint Science and Technology Program in 13th Five-Year (2016ZX05045004 （）
2016ZX05043005)and National Natural Science Foundation of China(51674050). （51674050）
