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| EXPERIMENTAL STUDY OF ACOUSTIC EMISSION OF SALT ROCK UNDER HIGH TEMPERATURE |
| WU Gang1，2，ZHAI Songtao3，SUN Hong3，ZHANG Yuan4 |
| (1. Chinese Underwater Technology Iinstitute，Shanghai Jiaotong University，Shanghai 200231，China；2. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China；3. Department of Civil Engineering，Shanghai Jiaotong University，Shanghai 200240，China；4. Faculty of Architecture and Civil Engineering，Huaiyin Institute of Technology，Huai?an，Jiangsu 223001，China) |
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Abstract 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.
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Received: 02 July 2013
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2014, Vol. 33 
