| Summary: | Liquid carbon dioxide blasting technology has a wide range of applications and is characterized by sound fracturing effects, low vibration hazards, and high safety. In order to investigate the characteristics and mechanism of CO<sub>2</sub> phase change rock breaking, liquid CO<sub>2</sub> blasting tests on rock-like specimens were carried out in this paper. The results show that 130 MPa is the threshold value at which a CO<sub>2</sub> blasting system moves from dynamic tensile stress damage to dynamic pressure stress damage. When blasting pressures of 100 MPa and 70 MPa are used, the lumpiness ratio of the fragments does not change much as the strength of the rock changes, so a suitable blasting pressure should be chosen to improve the blasting effect. Under the impact of blast stress and high-pressure gas flow, cracks develop to form a rough failure surface.
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