Page 176 - 《水资源与水工程学报》2023年第5期
P. 176

!34 " ! 5 #                       & ' ( ) & * + , -                               Vol.34No.5
               2023 $ 10%               JournalofWaterResources&WaterEngineering                 Oct.,2023

            DOI:10.11705/j.issn.1672-643X.2023.05.20


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                 EFGHI:TD313;TV16   JK7LM:A    JNOI:1672643X(2023)05017211

                       Variationlawofchargeinductionandmicroseismicsignalsof
                                        coalandrockundercyclicloading

                                                                             3
                                                 1,2
                                                                                      1
                                                               1
                                  ZHAOYangfeng ,DINGLing,LIUYuchun,LIBing
                     (1.SchoolofMechanicsandEngineering,LiaoningTechnicalUniversity,Fuxin123000,China;2.Liaoning
                       KeyLaboratoryofMineSubsidenceDisasterPreventionandControl ,Fuxin123000,China;3.Schoolof
                                     Sciences,LiaoningTechnicalUniversity,Fuxin123000,China)
                 Abstract:Inordertoimprovetherelevanceandaccuracyofthemonitoringandearlywarningofcoaland
                 rockunstablefailureindeepundergroundengineering,thechargeinductionandmicroseismicsignals
                 generatedbycoalandrockinthedeformationandfractureprocessundercyclicloadingweremonitored
                 simultaneouslybyaselfdevelopedmultichannelmonitoringsystem ,andthetime-frequencycharacter
                 isticsandenergyfeaturesofthesignalswereanalyzedandcomparedwiththoseoftheuniaxialcompres
                 siontests.Theresultsshowthatthechargeinductionandmicroseismicsignalsofcoalandrockundercy
                 clicloadinghavedifferentcharacteristicsatdifferentloadingstages ,moremicrofracturesaregeneratedin
                 thecyclicunloadingsection,andchargeinductionsignalswithsmallpeakvaluesfrequentlyoccurbefore
                 multiplesplittingfracturesgenerateinthecoalsamples.OfparticularnoteisthatFouriertransformand
                 spectrumanalysisofthesignalsshowthatthevariationcharacteristicsofthespectralbandandspectral
                 amplitudeofthemicroseismicsignalscanverywellreflecttheinternalfractureextensionofthecoalsam
                 ples ,andtheincreaseoftheamplitudeofthemainfrequencyissynchronouswiththatoftheamplitudeof
                 microseismicsignals.Thechargeinductionandmicroseismicsignalscanjointlydefinetheloadingprocess
                 ofthecoalandrock,whichcanprovidemoreaccurateearlywarninginformationonrockfailures.
                 Keywords:coalandrockunstablefailure;cyclicloadingandunloading;chargeinduction;microseis
                 micsignals;time-frequencycharacteristics




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