Dynamic properties and constitutive model of basalt after high-temperature treatment and water cooling under constant dynamic load

XU Zehui; HE Tong; DU Guanggang; LIU Lei

doi:10.11883/bzycj-2022-0421

Volume 43 Issue 6

Jun. 2023

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XU Zehui, HE Tong, DU Guanggang, LIU Lei. Dynamic properties and constitutive model of basalt after high-temperature treatment and water cooling under constant dynamic load[J]. Explosion And Shock Waves, 2023, 43(6): 063101. doi: 10.11883/bzycj-2022-0421

Citation:

XU Zehui, HE Tong, DU Guanggang, LIU Lei. Dynamic properties and constitutive model of basalt after high-temperature treatment and water cooling under constant dynamic load[J]. Explosion And Shock Waves, 2023, 43(6): 063101. doi: 10.11883/bzycj-2022-0421

Citation:

XU Zehui, HE Tong, DU Guanggang, LIU Lei. Dynamic properties and constitutive model of basalt after high-temperature treatment and water cooling under constant dynamic load[J]. Explosion And Shock Waves, 2023, 43(6): 063101. doi: 10.11883/bzycj-2022-0421

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Dynamic properties and constitutive model of basalt after high-temperature treatment and water cooling under constant dynamic load

doi: 10.11883/bzycj-2022-0421

XU Zehui^1
,,
HE Tong²,
DU Guanggang²,
LIU Lei^{2, 3
,
,}

1.
Faculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
3.
Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received Date: 2022-10-07
Rev Recd Date: 2023-04-12

Available Online: 2023-04-25

Publish Date: 2023-06-05

Abstract

Abstract

Experimental and theoretical investigations on basalt rock were implemented to explore the dynamic characteristics of rocks subjected to crustal stress, geothermal environment, and dynamic disturbance and to enrich the theoretical research of underground rock mass engineering. First, a split Hopkinson pressure bar (SHPB) device with a confining pressure loading system was used to carry out constant-pressure dynamic compression tests on basalt samples at room temperature (25 ℃) and those that have experienced high-temperature treatment (100, 300, 450, and 600 ℃) and water-cooling processes, with confining pressures of 2, 4 and 6 MPa. Second, static and microscopic tests were conducted to understand the effects of temperature and confining pressure on the dynamic mechanical properties and failure characteristics of basalt, respectively. Third, a dynamic constitutive model for basalt under confining pressure, high-temperature treatment, and water-cooling was constructed based on the Weibull distribution theory. The results show there is a temperature degradation effect on the dynamic peak stress and elastic modulus of basalt under the three sets of confining pressures. And the higher the confining pressure, the more significant the temperature degradation effect. In addition, a confining-pressure-induced strengthening effect on the dynamic peak stress and elastic modulus was observed for basalt samples at room temperature and those that have undergone the process of high-temperature treatment followed by water cooling, though the effect tends to be weak for the sample that has been subject to 600 ℃ treatment. For a given confining pressure, the degree of fragmentation of the sample increases with the heat-treatment temperature. For a given heat-treatment temperature, the degree of fragmentation of the sample decreases with the increase of confining pressure. The established dynamic constitutive model of basalt has good consistency with the experimental results and can be used to predict the dynamic mechanical behavior of basalt under the coupling effect of high-temperature treatment, water cooling and active confining pressure, thus providing theoretical support for underground resource development and protection of underground engineering.
- rock dynamics,
- high-temperature treatment and water cooling,
- dynamic properties,
- failure characteristics,
- constitutive model

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References(33)

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