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压缩与劈裂条件下矿岩声发射信号的频率特性
Frequency characteristics of rock acoustic emission in uniaxial compression and brazilian splitting test
投稿时间: 2016-11-14  最后修改时间: 2017-01-17
DOI:
中文关键词:  岩石声发射  单轴压缩  巴西劈裂  峰值频率  破裂尺度  幅值分布
英文关键词:rock acoustic emission  uniaxial compression  Brazilian splitting  peak frequency  fracture dimension  amplitude distribution
基金项目:国家杰出青年科学基金
作者单位E-mail
王金鹏 中南大学 291890271@qq.com 
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中文摘要:
      为研究岩石在单轴压缩与巴西劈裂加载条件下声发射信号的频率特性,在RMT-150C岩石力学试验系统上对流纹斑岩开展了单轴压缩和巴西劈裂条件下的声发射实验。实验结果表明:在单轴压缩实验中,声发射信号的峰值频率分布在550 kHz以下,550 kHz以上的信号极少,并且100 kHz以下的信号占大多数;而巴西劈裂实验中,声发射信号的峰值频率也分布在550 kHz以下,以100-200 kHz的信号为主。此外,岩样在单轴压缩破坏过程中声发射信号的峰值频率在达到峰值应力前明显降低,而巴西劈裂破坏过程中声发射信号的峰值频率主要集中在100-200 kHz以及400-500 kHz之间,在达到峰值应力前峰值频率变化不明显。
英文摘要:
      The experimental studies of rhyolite porphyry in uniaxial compression loading test and Brazilian splitting test are conducted on Rock Mechanics Testing system (RMT-150C) to investigate the acoustic emission frequency characteristics. Results show that peak frequencies are mostly distributed below 550 kHz and rarely have the peak frequencies higher than 550 kHz both in uniaxial compression loading test and Brazilian splitting test. The signals with peak frequencies below 100 kHz are in the majority in uniaxial compression loading test. However, the signals with peak frequencies between 100 kHz and 200 kHz are in the majority in Brazilian splitting test. In addition, the peak frequency of acoustic emission signals decreased obviously in a certain period just before peak stress in uniaxial compression process of rock samples. However, the peak frequency mainly distributed between 100-200 kHz and 400-500 kHz in Brazil splitting tests, and did not change significantly before reaching the peak stress.
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