热冲击作用下花岗岩宏观力学参量与热冲击速度相关规律试验研究

doi:10.13722/j.cnki.jrme.2019.0230

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Abstract The macroscopic mechanical properties of granite under thermal shock are closely related to the thermal shock velocity. Mechanical strength failure tests were conducted by using self-developed rock thermal shock cracking test bench，and the relationship between macroscopic mechanical parameters of granite and the thermal shock velocity under thermal shock was investigated. The results show that granite under thermal shock presents significant characteristics of unsteady heat transfer，and that the surface temperature，instantaneous thermal shock velocity and average thermal shock velocity present three distinct stages including rapid cooling for the first 20 s，slow cooling from 20–150 s and constant temperature after 150 s. At the first stage，the thermal shock velocity has a decisive effect on the macro mechanical parameters of granite and the thermal shock failure of granite is the most severe. The quantitative calculation formulas of compressive strength，tensile strength，cohesion，internal friction angle and thermal shock velocity were obtained，and a thermal shock factor representing thermal shock failure capability was proposed to further quantitatively classify thermal shock failure capability. The research work can enrich and develop the failure theory of high-temperature rock mechanics.

Key words： rock mechanics thermal shock macroscopic mechanical parameters thermal shock velocity thermal shock factor

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	Articles by authors
	XI Baoping1
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	WU Yangchun1
	ZHAO Yangsheng1
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Cite this article:

XI Baoping1,2,WU Yangchun1, et al. Experimental study on the relationship between macroscopic mechanical parameters of granite and thermal shock velocity under thermal shock[J]. , 2019, 38(11): 2194-2207.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0230 OR http://www.rockmech.org/EN/Y2019/V38/I11/2194

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