摘要:
通过室内岩石声发射试验研究在不同断裂情况下声发射信号的时空演化特征,对岩石工程 的监测预警具有一定的指导意义。 通过岩石的张拉和剪切试验,利用Geiger定位法和混合矩张量 理论分析了岩石不同断裂类型的时空演化特征,并利用数值模拟软件RFPA2D 进行验证。 试验结果 表明:在张拉破坏时,岩石在弯矩最大处首先开裂,并以张拉信号源为主;剪切破坏时,岩石在主裂 隙中部首先开裂,并出现零星的张拉信号源,但随着荷载的增加,其绝大部分的信号源为剪切信 号源。
Abstract:
Throughindoorrockacousticemissiontest,thestudyofthespatio-temporalevolutioncharacteristicsofacousticemissionsignalsunderdifferentfractureconditionshascertainguidingsignificance formonitoringandearlywarningofrockengineering.Throughthetensileandsheartestsofrock,the temporalandspatialevolutioncharacteristicsofdifferenttypesofrockfracturewereanalyzedbyusing theGeigerlocationmethodandthehybridmomenttensortheory,andthenumericalsimulationsoftware RFPA2Dwasusedtoverifyit.Duringthetensilefailureofrock,thecrackinginitiatedatthemaximum bendingmomentandthetensioningsignalsourceisthemainsource.Duringtheshearfailure,therocks crackfirstlyinthemiddleofthemaincrackandappearthescatteredsourceoftensionsignal,butwith theincreaseoftheload,thesourceismajorlyshearsignal.
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