高温–水冷却花岗岩动态压缩力学特性的应变率效应研究

doi:10.13722/j.cnki.jrme.2021.0316

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Abstract To explore the strain rate effect of high-temperature granite after cooling with water，MXQ1700 box-type atmosphere furnace was used to prepare granite samples with five different temperatures at 200 ℃，400 ℃，600 ℃，800 ℃，and 1 000 ℃，and then the high-temperature granite was cooled with water. The Separate Hopkinson Pressure Bar(SHPB) system was used to conduct dynamic compression tests with four different impact rates(pressures were 0.30，0.40，0.50 and 0.60 MPa). In addition，the pore size distribution，porosity，and micromorphology of the granite samples were obtained through mercury intrusion and scanning electron microscope(SEM) tests. The microscopic results show that the damage degree of the granite sample can be divided into two stages at 400 ℃. Before 400 ℃，the porosity was less than 2.20%，and the damage degree was lower. When the temperature exceeds 400℃，the proportion of medium-sized pores increases，and the degree of damage increases with the temperature rise. In terms of strain rate effect：under the same temperature conditions，the dynamic elastic modulus，dynamic peak stress，and peak strain of specimens all increased with the increase of the strain rate，but the strain rate effect of elastic modulus is not apparent. The rock fragmentation increased with the rising of damage，and the fractal dimension of the granite sample increases with the increase of the strain rate. The effect of internal damage and impact velocity on the strain rate were analyzed，and the fitting formula of strain rate with internal damage and impact velocity was obtained.

Key words： rock mechanics high temperature and water cooling SHPB dynamic properties strain rate effect

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	Articles by authors
	YU Liyuan
	WU Dongyang
	ZHANG Tao
	SU Haijian
	LIU Richeng
	WU Liangrui

Cite this article:

YU Liyuan,WU Dongyang,ZHANG Tao, et al. Study on strain rate effect of dynamic compression mechanical properties of high-temperature granite after cooling with water[J]. , 2022, 41(S1): 2615-2625.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0316 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2615

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