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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 
