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机构地区:[1]江西理工大学资源与环境工程学院,江西赣州341000 [2]江西理工大学工程研究学院,江西赣州341000
出 处:《工程勘察》2014年第1期6-10,共5页Geotechnical Investigation & Surveying
基 金:江西省教育厅科技计划项目(GJJ12336);江西省教育厅青年自然科学基金项目(GJJ12364);校级研究生创新专项资金项目(YC2012-X05)
摘 要:通过RMT-150C岩石力学测试系统与SAEU2S型声发射仪器,对粉砂岩进行了单轴压缩声发射试验。运用荷载—时间—振铃累计计数关系对岩样损伤阶段进行划分,利用经验模态分解法(EMD)对不同损伤阶段的典型信号源进行了分解,并结合EMD能量熵分析声发射信号能量分布,进而对岩体损伤阶段进行描述。结果表明,粉砂岩单轴压缩破裂可分为起始损伤期、损伤发展期、损伤加剧期、试件屈服期及试件断裂层剥离期五个阶段,其EMD能量熵主要能量所占优势频率分布情况呈现先往高频发展、再往低频发展的趋势。利用EMD能量熵能有效分辨岩样损伤过程中的声发射源信号特征,为评估岩体损伤变化奠定了基础。Acoustic emission (AE) tests on siltstone specimens are carried out with RMT-150C hydraulic-pressure servo testing system and acoustic emission instrument SAEU2S. Classifying the different damage stage by loading, accumulated ring count and time relationship, resolving the typical acoustic emission signals of different damage stages by empirical mode decomposition (EMD), analyzing the energy distribution of AE signals by EMD energy spectrum, then the rock mass damaging stages are described. The results show that the sihstone specimens failure under uniaxial compression are classified into five different stages, and they are initial stage, developing stage, aggravation stage, yield stage and failure stage. The dominant frequency distribution of the energy spectrum of EMD tends to be higher and then lower. The energy spectrum of EMD could distinguish effectively the characteristics of acoustic emission signals during the damage process of sihstone specimens, which lays the foundation for evaluation of rock mass damage.
关 键 词:岩石力学 粉砂岩 声发射 经验模态分解(EMD) 损伤
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