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| MECHANICAL CHARACTERISTICS OF SALT ROCK SUBJECTED TO UNIAXIAL COMPRESSION AND HIGH TEMPERATURE |
| ZHAI Songtao1，WU Gang2，3，ZHANG Yuan4，WU Xueping1 |
| (1. Department of Civil Engineering，Shanghai Jiao Tong University，Shanghai 200240，China；2. Chinese Underwater Technology Institute，Shanghai Jiao Tong University，Shanghai 200240，China；3. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China；4. Faculty of Architecture and Civil Engineering，Huaiyin Institute of Technology，Huai?an，Jiangsu 223001，China) |
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Abstract The uniaxial compression tests for Himalayas salt rock under different temperatures(20 ℃–700 ℃) and after high temperatures(after 100 ℃ and 200 ℃) were conducted to study mechanical characteristics and failure models. The variations of peak stress，peak strain and elastic modulus were analyzed，and especially focusing on the characteristics of stress-strain curves under high temperature. The research results show that，when the temperature is below 120 ℃，the compression strength and elastic modulus of salt rock decrease with temperature increasing，but increase when the temperature changes from 120 ℃ to 200 ℃. Under higher temperatures such as 500 ℃ or above，the internal structure of salt rock changes and the peak stress greatly reduces. The stress-strain curves of salt rock are quite different in different temperature ranges and 170 ℃ is a threshold temperature. When the temperature is 170 ℃–400 ℃，brittle characteristics no longer appears and salt rock shows significant strain hardening with increasing temperature. The limit temperature that Himalayas salt rock can withstand does not exceed 700 ℃. The carrying capacity of samples after high temperature of 100 ℃ and 200 ℃ is relative lower. Simultaneously，its deformation and elastic modulus are lower. There are more cracks and the integrity is inferior.
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Received: 01 March 2013
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2014, Vol. 33 
