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利用MTS 810材料测试系统和AE21C声发射检测仪对受高温作用的喜马拉雅山盐岩在加温及加载过程中声发射的演变过程进行试验研究,分析其在20℃~600℃高温下以及高温后不同受力阶段的声发射特征。研究结果表明:加温过程中,50℃~400℃盐岩的声发射率较50℃时明显下降,超过400℃后随温度的升高盐岩的声发射活动越频繁。单轴压缩过程中,20℃~150℃时盐岩的声发射活动频率及强度随温度升高而增大,而在170℃~600℃其声发射率随温度升高而降低。170℃~400℃是盐岩自愈性得到充分体现的温度区间。在相同温度下,高温下盐岩的声发射活动弱于高温后。
The evolution of acoustic emission during heating and loading of Himalayan salt rock subjected to high temperature was studied by using the MTS 810 material testing system and the AE21C acoustic emission detector. The effects of temperature on the acoustic emission at 20 ℃ ~ 600 ℃ and after high temperature Acoustic Emission Characteristics in Different Forces. The results show that the acoustic emission rate of salt rock at 50 ℃ ~ 400 ℃ is obviously lower than that at 50 ℃ during the heating process. Acoustic emission of salt rock is more frequent with the increase of temperature above 400 ℃. During uniaxial compression, the frequency and intensity of acoustic emission of salt rock increased with increasing temperature from 20 ℃ to 150 ℃, while the acoustic emission rate of salt rock decreased with increasing temperature at 170 ℃ ~ 600 ℃. 170 ℃ ~ 400 ℃ is self-healing salt rock fully reflect the temperature range. At the same temperature, the salt rock sound emission activity is weaker than the high temperature.