摘要
利用MTS810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 process of acoustic emission（AE） of Himalayan salt rock under high temperature and uniaxial loading conditions was investigated using the material test system MTS 810 and the acoustic emission detector AE21C. The characteristics of AE of salt rock at temperatures between 20 ℃ and 600 ℃ and at different loading stages after the high temperature were analyzed. The rate of AE of the salt rock when the temperature was between 50 ℃ - 400 ℃ was lower than that at 50 ℃ ; while the AE activity of salt rock in heating process became more frequently with the temperature rising if temperature was over 400 ℃. In the loading process, the frequency and the intensity of AE of the salt rock were increased with the rise of temperature when the temperatures were between 20 ℃ - 150 ℃, and the rate of AE of the salt rock was reduced with increasing temperature between 170 ℃ - 600 ℃. The temperature range of self-healing for salt rock is 170 ℃ - 400 ℃. The activity of AE of salt rock at high temperature is weaker than that after the high temperature though the temperature degree is the same.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第6期1203-1211,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(40872180)
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1004)
关键词
岩石力学
高温作用
盐岩
声发射
rock mechanics
high temperature function
salt rock
acoustic emission
