Experimental Investigation of Water-Inrush Risk Based on Permeability Evolution in Coal Mine and Backfill Prevention Discussion

Figure 3

The relationships between stress, permeability, and axial strain under different confining pressures. (a) 4 MPa; (b) 6 MPa; (c) 8 MPa; (d) 10 MPa.

(a)

(b)

(c)

(d)