Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite

ZHU Yaoliang; YU Jin; GAO Haidong; LI Gang; ZHOU Xianqi; ZHENG Xiaoqing

doi:10.11883/bzycj-2019-0169

Volume 39 Issue 8

Aug. 2019

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ZHU Yaoliang, YU Jin, GAO Haidong, LI Gang, ZHOU Xianqi, ZHENG Xiaoqing. Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite[J]. Explosion And Shock Waves, 2019, 39(8): 083104. doi: 10.11883/bzycj-2019-0169

Citation:

ZHU Yaoliang, YU Jin, GAO Haidong, LI Gang, ZHOU Xianqi, ZHENG Xiaoqing. Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite[J]. Explosion And Shock Waves, 2019, 39(8): 083104. doi: 10.11883/bzycj-2019-0169

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Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite

doi: 10.11883/bzycj-2019-0169

1.
Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen 361021, Fujian, China
2.
College of Engineering, Fujian Jiangxia University, Fuzhou 350108, Fujian, China
3.
China Railway 18 Bureau Group Co., Ltd., Tianjin 300222, China

Received Date: 2019-04-26
Rev Recd Date: 2019-05-21
Publish Date: 2019-08-01

Abstract

Abstract

The microscopic damage and dynamic mechanical properties of high-temperature granite after water cooling were studied through wave velocity test, nuclear magnetic resonance (NMR) test, split Hopkinson pressure bar (SHPB) impact test and scanning electron microscope（SEM）test. The variation of porosity and dynamic mechanical parameters of granite were analyzed. The results show that the wave velocity of high-temperature granite decreases nonlinearly after water cooling and the components of porosity with large pore increase with the increase of temperature. Moreover, water cooling leads to the more cracks and greater crack sizes than that of natural cooling. The dynamic parameters of high-temperature granite after water cooling show that the increase in temperature results in a decrease in the peak stress, an increase in the peak strain, and an increase at first then decrease in the elastic modulus. Additional thermal stress, resulted from sharply decrease in surface temperature of the high-temperature granite, leads to increased internal damage and decreased wave velocity and peak stress. Compared with natural cooling, the plasticity of high-temperature granite is reduced, because the cold hardening effect improves the hardness of surface granite. After water cooling, the granite specimens exhibit the brittle failure characteristics and their peak strain decreases but their elastic modulus increases. Cooling way has a minor effect on the cracks induced by shock before 400 ℃. As the temperature up to 800 ℃, the impact fracture surface of granite after natural cooling is characterized by honeycomb and irregular shape, in contrast, the impact fracture surface of granite after the water cooling is relatively flat.
- high-temperature granite,
- water cooling,
- microscopic damage,
- dynamic mechanical properties,
- cold hardening effect

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References

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