Study on Hydraulic Connection and Seepage Law of Goaf Groups in Coal Mine Underground Reservoir

Figure 7

Cloud map of ratio and water trace of goaf at different water levels and coal pillar widths. (a) Water level at 18.65 m. (b) Water level at 28.65 m. (c) Water level at 38.65 m.

(a) Water level at 18.65 m

(b) Water level at 28.65 m

(c) Water level at 38.65 m