Fig. 13

Cloud Diagram of the Instability Law of Medium-Hard Rock Layer 1. Figure (a) Displacement Cloud Diagram when the Working Face Advances by 56 m, Figure (b) Displacement Cloud Diagram when the Working Face Advances by 80 m, Figure (c) Displacement Cloud Diagram when the Working Face Advances by 104 m, Figure (d) Displacement Cloud Diagram when the Working Face Advances by 128 m.