Experiment on Seepage Property and Sand Inrush Criterion for Granular Rock Mass

Figure 4

Rock particles with different size ranges: (a) 2.5 to 5.0 mm; (b) 5.0 to 8.0 mm; (c) 8.0 to 10.0 mm; (d) 10.0 to 12.0 mm; (e) 12.0 to 15.0 mm; (f) 15.0 to 20.0 mm.

(a)

(b)

(c)

(d)

(e)

(f)