冷却介质对花岗岩热冲击破裂程度的影响研究

doi:10.13722/j.cnki.jrme.2022.0849

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Abstract In order to explore the effect of water temperature on the thermal shock process of granite at high temperature，based on the heat shock heat transfer theory，the constant temperature convection heating experiments with different heat source temperatures were designed and conducted. Through theoretical derivation and data analysis，the following conclusions were obtained：(1) high temperature granite in unboiling water thermal shock cooling，temperature gradient and thermal shock rupture decrease with increasing water temperature. When thermal shock cooling in boiling water，the temperature gradient and thermal shock rupture are significantly greater than in the case of thermal shock in unboiling water at any temperature. (2) The experimental results prove that the convective heat transfer coefficient of boiling water is greater than that of unboiling water by more than one order of magnitude. When the high temperature granite is cooled by thermal shock in water(0 ℃–100 ℃)，the effect of the dramatic change of convective heat transfer coefficient due to boiling on thermal shock is significantly greater than that caused by temperature difference and thermal conductivity of rock material. (3) In engineering，it is more economical，energy efficient and effective to enhance or avoid thermal shock rupture by changing the convective heat transfer coefficient of fluid medium rather than changing the material thermal conductivity and temperature difference. This study contributes to the fine characterization of thermal shock rupture of rock materials and also provides guidance for engineering involving thermal shock rupture.

Key words： rock mechanics granite thermal shock cooling medium temperature difference convective heat transfer coefficient phase change

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	Articles by authors
	HE Shuixin1
	XI Baoping1
	2
	DONG Yunsheng1
	CAO Yu1
	JIA Peng1
	ZHAO Yangsheng1

Cite this article:

HE Shuixin1,XI Baoping1,2, et al. Influence of cooling medium on granite thermal shock fracture[J]. , 2023, 42(S2): 4006-4017.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0849 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4006

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