石英岩加卸载声发射特性研究

发布时间：2018-05-18 13:56

本文选题：单轴加载 + 主破裂阶段　；参考：《矿业研究与开发》2017年08期

【摘要】：为了研究岩体在掘进过程中其内部破损的过程,采用TYP-500型三轴压缩试验机和PCI-2声发射系统对灵宝金矿石英岩进行单轴和三轴压缩声发射试验,以分析岩石破坏过程中的声发射特征。试验结果表明:在声发射试验过程中,石英岩的振铃计数与能量释放近似成正比例关系;当岩样发生破裂时,主破裂之前能量提高,表明岩样内部裂隙裂纹增多,释放大量能量,岩体承载力迅速下降;单轴压缩下声发射信号峰值和应力峰值基本同时发生,而三轴压缩下声发射信号峰值滞后于岩样应力峰值,因此认为,主破裂前围压加强了岩样的峰后承载能力,主破裂后单轴压缩下的岩体较三轴压缩条件下相对稳定。
[Abstract]:In order to study the process of internal damage of rock mass during excavation, uniaxial and triaxial compression acoustic emission tests of quartz rock in Lingbao Gold Mine were carried out by using TYP-500 triaxial compression testing machine and PCI-2 acoustic emission system. The characteristics of acoustic emission during rock failure are analyzed. The experimental results show that the ringing number of quartz rock is approximately proportional to the energy release during the acoustic emission test, and that the energy increases before the main rupture when the rock sample is ruptured, which indicates that the cracks in the inner crack of the rock sample increase. Under uniaxial compression, the peak value of acoustic emission signal and the peak value of stress basically occur at the same time, while the peak value of acoustic emission signal under triaxial compression lags behind the peak value of rock sample stress, so it is considered that the peak value of acoustic emission signal under uniaxial compression is lower than that of rock sample stress. The post-peak bearing capacity of rock samples is strengthened by confining pressure before main rupture, and the rock mass under uniaxial compression after main rupture is relatively stable than that under triaxial compression.
【作者单位】：北京科技大学土木与资源工程学院;
【分类号】：TD315

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