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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摘要为探究高温–水冷却花岗岩的应变率效应，使用MXQ1700箱式气氛炉制备200 ℃，400 ℃，600 ℃，800 ℃和1 000 ℃共5种高温花岗岩试样并用水冷却，随后利用分离式霍普金森压杆系统对常温试样和高温–水冷却花岗岩试样进行4种不同冲击速率的动态压缩试验(冲击气压分别为0.30，0.40，0.50和0.60 MPa)。此外，还通过压汞和扫描电镜试验获得高温–水冷却花岗岩试样的孔径分布、孔隙率和微观形貌。微观结果表明：试样内部损伤以400 ℃为界可分为两个阶段，400 ℃之前，高温–水冷却花岗岩试样内部以微孔和小孔为主，孔隙率低于2.20%，损伤较小，当温度超过400 ℃后，内部中孔比例快速增加，孔隙率上升，损伤随温度升高而加剧。应变率效应方面：在相同温度条件下，高温–水冷却花岗岩试样的动态峰值应力和峰值应变均随应变率的增加而增大，而弹性模量的应变率效应不明显；花岗岩试样破碎程度随损伤的增加而加剧，且分形维数随着应变率的增大而增加；分析内部损伤和外界冲击速度对花岗岩试样应变率的影响，并获得应变率随内部损伤和冲击速度变化的拟合公式。

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	蔚立元
	武东阳
	张涛
	苏海健
	刘日成
	吴梁瑞

关键词 ：岩石力学, 高温&ndash, 水冷却, 霍普金森压杆系统, 动态力学性能, 应变率效应

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

引用本文:

蔚立元，武东阳，张涛，苏海健，刘日成，吴梁瑞. 高温–水冷却花岗岩动态压缩力学特性的应变率效应研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2615-2625.
YU Liyuan，WU Dongyang，ZHANG Tao，SU Haijian，LIU Richeng，WU Liangrui. Study on strain rate effect of dynamic compression mechanical properties of high-temperature granite after cooling with water. , 2022, 41(S1): 2615-2625.

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

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