高温损伤花岗岩细观结构演化试验研究

doi:10.13722/j.cnki.jrme.2024.0297

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Abstract Understanding the mesostructural evolution of high-temperature damaged granite is crucial to reveal the degradation mechanism of its macro-physical and mechanical properties. In this study，granite was treated at high temperature(25 ℃，100 ℃，200 ℃，300 ℃，400 ℃，500 ℃ and 600 ℃)，and then the uniaxial compression test was carried out on the thermal-treated granite. Finally，the meso-structure of granite was qualitatively and quantitatively analyzed using optical microscope，CT scanning and nuclear magnetic resonance(NMR). The results indicate that the mechanical properties of granite are strongly dependent on temperature，and the compressive strength increases at first and then decreases with the temperature. 200 ℃ is the peak temperature of thermal strengthening effect，400 ℃ is the threshold temperature for meso structural damage of granite，and 600 ℃ is the threshold temperature of brittle-ductile transition of granite. Further analysis indicates that the high temperature leads to a denser structure of granite and the porosity decreases with temperature at 25 ℃–200 ℃. The initiation and propagation of thermally-induced cracks can be observed in granite after 300 ℃. These cracks propagate from the edge to the interior of the specimen，and the number of pores increases with the temperature，and mesopore and macropores are dominant. The porosity increases exponentially with temperature. In addition，the fractal dimension of micropores decreases with temperature，which means that high temperature simplifies the structure of micropores，while mesopores and macropores show good fractal characteristics and are not affected by temperature.

Key words： rock mechanics granite high temperature thermally-induced cracks pore structure

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	Articles by authors
	BU Mohua1
	2
	GUO Pingye1
	2
	JIN Xin1
	2
	HE Manchao1
	2
	WANG Jiamin3

Cite this article:

BU Mohua1,2,GUO Pingye1, et al. Experimental study on evolution of meso-structure of granite subjected to high temperature[J]. , 2024, 43(11): 2639-2654.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0297 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I11/2639

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