Mesoscopic Mechanism of Permeability of Coal Rock Mass with Increasing Temperature in the Range of Room Temperature to 350°C

Figure 7

Microimage of identification pore changes of fine sandstone sample with the increasing temperature. (a) 22°C; (b) 60°C; (c) 90°C; (d) 120°C; (e) 150°C; (f) 180°C; (g) 210°C; (h) 240°C; (i) 270°C; (j) 300°C; (k) 350°C.

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