Fig 1.
Mechanical properties testing of raw coal seam.
(a) Preparation of the coal samples for mechanics performance tests; (b) Experimental results of uniaxial compression.
Table 1.
Mechanical performance parameters of material.
Fig 2.
Preparation of model test specimen.
Fig 3.
Experimental facility of liquid CO2 phases change fracturing.
(a) liquid CO2 filling system; (b) confining loading system; (c) placement method of coal rock specimen.
Table 2.
Parameters of liquid-CO2 phase change blasting experiments.
Fig 4.
Failure pattern of the coal-rock model specimen surface after the fracturing experiments.
(a) specimen 1; (b) specimen 2; (c) specimen 3; (d) specimen 4; (e) specimen 5.
Fig 5.
Cracks of each surface of specimen 1 after the fracturing experiment.
Fig 6.
Cracks of each surface of specimen 2 after the fracturing experiment.
Fig 7.
Cracks of each surface of specimen 3 after the fracturing experiment.
Fig 8.
Cracks of each surface of specimen 4 after the fracturing experiment.
Fig 9.
Cracks of each surface of specimen 5 after the fracturing experiment.