Experimental Study on High-Pressure Air Blasting Fracture for Coal and Rock Mass

Figure 1

High-pressure nitrogen blasting and cracking experimental system of coal and rock mass. 1: nitrogen cylinders; 2: air compressor; 3: gas booster pump; 4, 6, 7, 8, 18, 19, and 20: control valve; 5: electrical contact pressure gauge; 9: 1 L high-pressure vessel; 10 and 11: 2 L high-pressure vessel; 12–14: the vent valve; 15–17: mechanical pressure gauge; 21: the pneumatic high-pressure shut-off ball valve (pneumatic valve); 22: release tube; 23: releasing hole; 24: pressure chamber; 25: gaskets; 26: specimen; 27: millisecond pressure transmitter; 28: dynamic and static strain gauge; 29: computer acquisition system.