[1] WANG Z F,LI H J,CHEN X,et al.Study on hole layout of liquid CO2 phase-transforming fracture technology for permeability improvement of coal seam[J].Journal of Safety Science and Technology,2015.

[2] LI W,LIU Z,SU E,et al.Experimental investigation on the effects of supercritical carbon dioxide on coal permeability:implication for CO2 Injection method[J].Energy & fuels,2019,33(JAN):503-512.

[6] SINGH S P.Non-explosive applications of the PCF concept for underground excavation[J].Tunnelling & Underground Space Technology,1998,13(3):305-311.

[14] ZHOU S,JIANG N,HE X,et al.Rock breaking and dynamic response characteristics of carbon dioxide phase transition fracturing considering the gathering energy effect[J].Energies,2020,13(6):1336.