基于巴西劈裂试验的花岗岩热损伤研究

doi:10.13722/j.cnki.jrme.2018.0576

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Abstract

Brazilian splitting tests were conducted on standard granite discs treated under 25 ℃，200 ℃，400 ℃，600 ℃，and 800 ℃，respectively，to investigate the macroscopic physical and mechanical properties，including tensile strength，volume expansion ratio，P-wave velocity. In addition，temperature effect on microstructure and acoustic emission(AE) characteristics of granite was studied. Results show that：(1) Scanning electron microscope (SEM) inspections reveal that there exist temperature-induced microcracks within the granite discs，including intragranular crack，intergranular crack and transgranular crack. With the increase of temperature，the number，extension length，opening width，and extended range of microcracks increase monotonically. The temperature sensitivity of different mineral compositions are different；(2) After high-temperature treatment，the tensile strength decreases，the volume of granite disc expands，and the P-wave velocity reduces；(3) The P-wave velocity drops sharply and the crack density of granite sections increased sharply in the range of 400 ℃–600 ℃，indicating a thermal damage threshold within this temperature range；(4) Results of AE events show different characteristics of AE temporal sequences of discs treated by different high temperature，and the number of AE events during the loading process of the discs treated by the higher temperature(600 ℃ and 800 ℃) is obviously less than that of those treated by lower temperature(≤400 ℃)，moreover，the increasing range of AE events decreased significantly before the splitting of the discs，and the correlation between the AE locating results and the macroscopic splitting cracks is weak.

Key words： rock mechanics high temperature thermal damage granite Brazilian splitting test scanning electron microscope(SEM) acoustic emission(AE)

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	Articles by authors
	WU Shunchuan1
	2
	GUO Pei1
	ZHANG Shihuai1
	ZHANG Guang1
	JIANG Rihua1

Cite this article:

WU Shunchuan1,2,GUO Pei1, et al. Study on thermal damage of granite based on Brazilian splitting test[J]. , 2018, 37(S2): 3805-3816.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0576 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3805

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