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Abstract According to the experimental research on mechanical properties of water-cooled granite samples under high temperatures within 600 ℃，the degradation mechanism of thermal cracking of water-cooled granite is discussed. The results show that during water cooling process under high temperature，thermal cracking and thermal shock are found in granite samples due to drastic changes of temperature；and the mechanical properties of rock mass are degraded when temperature decreases gradually，such as supersonic wave，uniaxial compressive strength，tensile strength and elastic modulus. The following results are also presented：(1) when granite is cooled from high temperature，the supersonic wave is of negative exponential law with temperature；(2) the peak stress，the peak strain and the uniaxial compression strength of water-cooled granite are greatly affected；(3) high temperature with water cooling treatment has great influence on the tensile strength of granite；and (4) the elastic modulus with increasing temperature has negative logarithmic law for water-cooled granite samples.
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Received: 21 November 2009
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