Self-Designed Hydrophilicity-Related Geomaterials and Their Testing Utility in Simulation of Overlying Strata Instability

Figure 8

Failure process diagram of the overlying strata. Face advancing (a) 20 m, (b) 40 m, (c) 60 m, (d) 80 m, (e) 100 m, (f) 120 m, (g) 140 m, (h) 160 m, and (i) 220 m.