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

Table 3

Field drilling results of overburden fracture height in 21103 working face of 21-1 coal seam.

Working face	Coal	Drilling number	Mining thickness (m)	Height of caving zone (m)	Height of fissure zone (m)
21103	21-1	CH01	3.8	12.55	80.47
		Ch02		10.98	72.76