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

Figure 7

Variation curve of seepage velocity with hydraulic gradient. (a) Sample FF1. (b) Sample FF2. (c) Sample FF3. (d) Sample FF4. (e) Sample FF5.

(a)

(b)

(c)

(d)

(e)