Research on the Influence of Slurry Filling on the Stability of Floor Coal Pillars during Mining above the Room-and-Pillar Goaf: A Case Study

Figure 2

The control effect of the key stratum: (a) before the breakage of KS1; (b) after the breakage of KS1; (c) before the breakage of KS2; (d) after the breakage of KS2; (e) before the breakage of PKS; (f) after the breakage of PKS.

(a)

(b)

(c)

(d)

(e)

(f)