液态CO2相变破岩技术述评研究
Research and review about the liquid CO2 phase-transforming rock fracturing technology

作为物理破岩技术，液态CO2相变致裂技术自研发以来，其应用由煤层增透逐渐扩展到岩体破裂，克服了炸药爆破破坏性大、危险性高的缺点，为岩体开挖提供了新的思路。随着CO2相变破岩技术的发展，泄放能量不断提升，施工工艺不断进步，破岩效果不断增强。但其破岩过程及机理的研究刚起步，理论研究落后于工程实践，这在一定程度上制约该技术的进一步发展，制约其向深部地下工程扩展和大规模推广。本文针对液态CO2相变破岩技术的起源、原理、应用和研究进展等方面进行介绍，并对上述科学问题及后续研究重点进行展望。
Since the liquid CO2 phase-transforming rock fracturing technology has been developed, its application has been widened from the area of coal seam permeability increment to rock fracture and fragmentation. As a physical rock fracturing technology, it overcomes the drawbacks of the devastating damage and high risk of explosive detonation, and enlightens a new thought of rock excavation method. With the development of phase-transforming fracturing technology, the energy utilization rate of fracturing has been promoted, and the operation technique has been improved, while the fracturing performance is becoming better and more controllable. However, the investigation on the mechanism of this technology has just started, and some significant issues still remain untouched. The theory on understanding the phase-transforming fracturing technology is far more behind its usage in practical engineering, which limits its further development and wider application in the area of rock fragmentation, particularly in deep underground rock engineering. This paper introduced the origination and principle of the liquid CO2 phase-transforming (rock) fracturing technology, overviewed the current applications and progresses. Besides, key scientific problems and future research emphasis were prospected