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利用MTS815 Flex Test GT岩石力学试验系统和PCI-2声发射(AE)3维定位实时监测系统,开展不同围压下盐岩的三轴压缩声发射定位试验,探讨盐岩轴向加载过程中声发射特征的围压效应。结果表明:盐岩AE定位点多少与振铃计数率大小、能率高低具有良好的一致性。声发射高计数、高能率、定位点集聚段等随围压增加而滞后。低围压下,盐岩发生剪切破坏,高计数、高能率、AE定位点集聚段主要出现在屈服阶段和峰值应力前阶段;高围压下,盐岩呈塑性大变形特征,高计数、高能率、AE定位点集聚段主要在峰值及峰后阶段出现。围压增加,累计计数和定位点的总量呈减少趋势;最大能率和累计能量随围压增加而减小,围压为5 MPa时分别约为30 MPa时的43倍和22倍。
Using MTS815 Flex Test GT rock mechanics test system and PCI-2 acoustic emission (AE) 3-D positioning real-time monitoring system, the triaxial compression acoustic emission positioning experiment of salt rock under different confining pressures was carried out to investigate the acoustic response of rock salt during axial loading The confining pressure effect of the launch feature. The results show that there is a good agreement between the AE positioning point of salt rock and the counting rate of ringing and the energy rate. Acoustic emission high count, high energy rate, set point and other agglomeration increases with the confining pressure and lag. At low confining pressure, the salt rock is sheared and destroyed, and the high-count, high-energy rate and AE site are mainly in the yield stage and peak pre-stress stage. Under the high confining pressure, the salt rock is characterized by large plastic deformation, High-energy-rate, AE site agglomeration occurs mainly in the peak and post-peak phases. As the confining pressure increased, the total count and positioning points decreased. The maximum energy rate and cumulative energy decreased with the increase of confining pressure. When the confining pressure was 5 MPa, they were 43 and 22 times higher than those at 30 MPa respectively.