TY - JOUR
TI - Determination of rock damage characteristics after laser irradiation based on computed tomography scanning and the nuclear magnetic resonance technique
AU - Zhou Xue-Min
AU - Gao Ming-Zhong
AU - Liu Jun-Jun
AU - Yang Lei
AU - Hao Hai-Chun
AU - Ao Tian-Xiang
AU - Yang Yi-Kun
AU - He Zhi-Qiang
JN - Thermal Science
PY - 2024
VL - 28
IS - 4
SP - 3559
EP - 3565
PT - Article
AB - Efficiently crushing deep hard rock remains a significant engineering  challenge. As an innovative rock-breaking technique, laser technology shows  considerable promise for applications in deep engineering. Analyzing the  damage characteristics of rock after laser irradiation and clarifying the  mechanism of laser rock-breaking are crucial for advancing this technology  towards practical engineering applications. Taking basalt as a typical  representative of deep hard rock, we introduced computed tomography (CT)  scanning and nuclear magnetic resonance (NMR) technology to study the  internal macro and micro pore characteristics of the rock after laser  irradiation with different power. Additionally, we reconstructed the  morphology of the laser-drilled holes. The results show that the surface  temperature of the rock under laser irradiation generally follows a  Gauss­ian distribution, and the penetration depth of the 1250 W laser can  reach 41.51 mm after 30 seconds. Laser irradiation affects the microscopic  pores of the rock, causing small pores to expand into larger ones as the  laser power increases. After laser irradiation, the molten holes can be  categorized into drum-shaped and V-shaped zones, and the timely discharge of  molten material enhances the efficiency of laser rock-breaking. These  findings provide theoretical and technical support for the application of  laser rock-breaking technology in the efficient crushing of deep hard rock  and resource extraction.