Physical Simulation of the Water-Conducting Fracture Zone of Weak Roofs in Shallow Seam Mining Based on a Self-Designed Hydromechanical Coupling Experiment System

Figure 7

The experimental results of mining period.

(a) Excavated to 40 m

(b) Excavated to 100 m

(c) Excavated to 140 m

(d) Distribution of fracture development in Area A