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Experimental study on high pressure nitrogen blasting fracture for coal and rock mass
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modified on 2018-09-03, 00:59 FIGURE 1: High
pressure nitrogen blasting and cracking experimental system of coal and rock
mass.
FIGURE 2: Molding experimental blocks
FIGURE 3: Release tube and its dimensional drawing. (a) Release tube; (b) dimensional drawing of release tube.
FIGURE 4: The macroscopic crack morphology on the experimental blocks’ surface under the designed condition of 1L gas volume. (a) P=5MPa; (b) P=7.5MPa; (c) P=10MPa.
FIGURE 5: The macroscopic crack morphology on the experimental blocks’ surface under the designed condition of gas pressure of 10 MPa. (a) V=1L; (b) V=2L; (c) V=3L.
FIGURE 6: p-t curve of high pressure nitrogen fracturing under different design gas pressure conditions. (a) P=5MPa; (b) P=7.5MPa; (c) P=10MPa.
FIGURE 7: p-t curve of high pressure nitrogen fracturing under different design gas volume conditions. (a) V=1L; (b) V=2L; (c) V=3L.
