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| Experimental study on physico-mechanical and transport properties of granite subjected to rapid cooling |
| JIN Peihua1，2，HU Yaoqing1，2，SHAO Jixi1，2，ZHAO Guokai1，2，ZHU Xiaozhou1，2，LI Chun1，2 |
| (1. Institute of Mining Technology，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. 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 study on physico-mechanical and transport properties of granite under the rapid cooling is of great significance for understanding the variation of reservoirs of hot dry rock. The rapid cooled granite from 20 ℃ to 600 ℃ was tested to investigate the physico-mechanical properties of the samples rapid cooled from different temperatures. The permeability of the cylindrical samples was measured with the pressure pulse decay method. With the temperature increasing，the density，longitudinal wave velocity，compressive strength，elastic modulus and tensile strength of the rapid cooled samples decrease monotonously，and the permeability increases initially slowly and then sharply. This is because that the inhomogeneous and anisotropic thermal expansion of the mineral grains leads to the thermal cracking of the granite at the slow heating and heat preservation stage. Upon the rapid cooling，the temperature gradients generate the stress along the radial direction of sample and induces more cracks，which ultimately leads to the deterioration of the physic-mechanical properties and the enhancement of permeability. Under the rapid cooling，the brittle-ductile transition temperature of granite is between 500 ℃ and 600 ℃，below and above which the granite exhibits mainly the brittle failure and the ductile failure respectively. Under slow heating，rapid cooling and unconfined condition，the threshold temperature for the variation of permeability of granite is 400 ℃. The damage factor based on the elastic modulus reflect accurately the deterioration of the mechanical properties of granite，while the damage factor based on the longitudinal wave velocity overestimates it.
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2018, Vol. 37 
