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| Experimental study on mechanical properties of granite subjected to temperature and stress cycles#br# |
| HU Yuefei，HU Yaoqing，ZHAO Guokai，JIN Peihua，LI Chun，ZHU Xiaozhou#br# |
(Key Laboratory of In-situ Property-improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China)
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Abstract The uniaxial compression test of granite specimens under temperature and stress cycles was carried out to reveal the mechanical properties of granite subjected to temperature and stress cycles. The results show that，with increasing the cycle number，the Young¢s modulus of the granite increases gradually while the strain corresponding to the upper stress of the samples decreases. The decrease amplitude of the upper limit strain at the upper limit stress of 85% uniaxial compressive strength is greater than that at 70% uniaxial compressive strength. Except for 600 ℃，the uniaxial compressive strength of the samples after temperature and stress cycles is greater than that at real-time temperature. Especially for 300 ℃，the strength increase rates at the upper cycle stresses corresponding to 70% and 85% uniaxial compressive strength reach 57.1% and 50.9% respectively. After temperature and stress cycles，the strength of the granite specimen changes significantly while the peak strain almost keeps invariable，which shows that studying the stability of rock from deformation rather than strength is more consistent with the actual situation. The results can provide reference to study the stability of rock engineering under the cyclic action of temperature and stress.
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2020, Vol. 39 
