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Extraction and identifcation of spectrum characteristics of coal and rock hydraulic fracturing and uniaxial compression signals

查看全文 作　　者：Ya′nan [1,2]Qian;Quangui [1,2,3]Li;Qianting [1,2]Hu;Zhizhong [4]Jiang;Ronghui [1,2]Liu;Jie [1,2,5]Li;Wenxi [1,2]Li;Changjun [1,2]Yu 高影响力作者 机构地区：[1]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;[2]School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China;[3]State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines(Anhui University of Science and Technology),Huainan 232001,China;[4]Mining College of Guizhou University,Guiyang 550025,Guizhou,China;[5]China Coal Technology and Engineering Group Shenyang Research Institute,Fushun 113122,China高影响力机构 出　　处：《International Journal of Coal Science & Technology》索引2023年第10卷第4期,共16页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(52074049);Chongqing Natural Science Foundation(cstc2021jcyj-msxmX0764);the Independent Research fund of The State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines(Anhui University of Science and Technology)(SKLMRDPC19KF07). 摘　　要：Microseismic(MS)events generated during coal and rock hydraulic fracturing(HF)include wet events caused by fracturing fuid injection,in addition to dry events caused by stress perturbations.The mixture of these two events makes efective fracturing MS events pickup difcult.This study is based on physical experiments of diferent coal and rock HF and uniaxial compression.The diferences of waveform characteristic parameters of various coal and rock ruptures were analyzed using the Hilbert–Huang transform,leading to some useful conclusions.The phase characteristics of the acoustic emission(AE)energy difered signifcantly and responded well to the pumping pressure curve.The AE waveforms of HF exhibit similar energy and frequency distribution characteristics after Empirical mode decomposition.The main frequency bands for coal,sandstone,and shale samples are 100–300 kHz,while the mudstone sample is in the range of 50–150 kHz.The decay ratios for coal,sandstone,shale and mudstone samples are 0.78,0.83,0.67 and 0.85,respectively.When compared to the uniaxial compression test,the main frequency bands of HF were reduced for coal,sandstone and mudstone samples,whereas shale remained essentially unchanged.The duration,instantaneous energy,and total energy of the HF waveform are smaller than those of uniaxial compression,while the decay ratio is greater,especially for the mudstone samples.The waveform characteristic parameters,trained using the multilayer perceptron neural network,can efectively identify HF and uniaxial compression events with an accuracy of 96%. 关 键 词：Hydraulic fracturing Uniaxial compression Hilbert-Huang transform Acoustic emission Microseismic
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