Experimental Investigation of Water-Sand Mixed Fluid Initiation and Migration in Filling Fracture Network during Water Inrush

Figure 3

Sand samples. (a) 0.075–0.15 mm. (b) 0.15–0.3 mm. (c) 0.3–0.6 mm. (d) 0.6–1.0 mm. (e) 1.0–2.0 mm. (f) 2.0–2.36 mm. (g) 2.36–4.75 mm. (h) 4.75–9.0 mm.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)