Surface Subsidence Prediction Method for Coal Mines with Ultrathick and Hard Stratum

Figure 8

Subsidence contour maps after the mining of working faces 204, 205, 206, and 207, respectively, in the second panel. (a) After the mining of working face 204. (b) After the mining of working faces 204 and 205. (c) After the mining of working faces 204, 205, and 206. (d) After the mining of working faces 204, 205, 206, and 207.

(a)

(b)

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(d)