Thermal-breaking characteristics and crack distribution of rock irradiated by laser beams

WANG Yijiang; YU Dongxu; SUN Lipeng; ZHU Qiyin; WANG Jianzhou

doi:10.11779/CJGE20230396

Volume 46 Issue 9

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Chinese Journal of Geotechnical Engineering > 2024 > 46(9): 1809-1819. > DOI: 10.11779/CJGE20230396

WANG Yijiang, YU Dongxu, SUN Lipeng, ZHU Qiyin, WANG Jianzhou. Thermal-breaking characteristics and crack distribution of rock irradiated by laser beams[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(9): 1809-1819. DOI: 10.11779/CJGE20230396

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Thermal-breaking characteristics and crack distribution of rock irradiated by laser beams

WANG Yijiang^{1, 2, 3,},
YU Dongxu¹,
SUN Lipeng¹,
ZHU Qiyin^{2, 3},
WANG Jianzhou^{2, 3}

1.
School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
2.
Yunlong Lake Laboratory of Deep Underground Science and Engineering, Xuzhou 221116, China
3.
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

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Received Date: May 07, 2023
Available Online: March 24, 2024

Graphical Abstract

Abstract

Abstract

The laser-assisted rock breaking is a non-contact technology employed for the rock fragmentation, with its efficiency contingent upon the laser power, irradiation time and defocusing distance. To explore the effects of various irradiation parameters, the rock-breaking tests are conducted on three distinct rock types, including limestone, sandstone and granite. The temperature field, perforation parameters, specific energy, thermal-cracking energy, crack distribution, mineral composition and microstructural characteristics are studied. The results demonstrate that the rock surface temperature subjected to laser irradiation experiences a substantial increase, with the maximum temperature and temperature gradient of 2000 ^oC and 1500 ^oC/mm, respectively. The granite sample exhibits the highest surface temperature and temperature gradient, followed by sandstone, and the limestone displays the lowest values. The perforation diameter, depth and speed of rocks are closely associated with the corresponding irradiation parameters. The sandstone, limestone and granite exhibit the maximum perforation speeds of 3.18 mm/s, 2.68 mm/s and 0.8 mm/s, respectively. The relationship between specific energy and irradiation parameters mirrors that of thermal-cracking energy under the same irradiation parameters. However, the specific energy values are approximately 1-2 orders of magnitude higher than the corresponding thermal-cracking energy values. The specific energy ranking for the three rock types is as follows: granite > sandstone > limestone. The rock samples exhibit a notable presence of radial cracks that extend to the edges. The limestone and granite samples display extensive development of the secondary cracks, whereas the sandstone shows no significant presence of the secondary cracks. The irradiated rock samples demonstrat evident alterations in both diffraction intensity and microstructures when compared with their corresponding original samples.
- laser-assisted rock breaking,
- temperature distribution,
- specific energy,
- thermal-cracking energy,
- crack distribution

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