Mechanism and Control of Water–Rock Coupling-Induced Disaster when Mining below the Unconsolidated Confined Aquifer

Table 7

Influence of the height of the waterproof coal pillar on the overlying strata structure stability.

Height of waterproof coal pillar (m)	Overlying load (MPa)		Displacement (mm)		Fracture height (m)
	Key strata	Lower water-resisting	Key strata	Lower water-resisting
55	5.41	4.47	3968.00	3877.00	55.00
70	3.49	4.59	3956.00	3839.00	70.00
85	0.60	5.26	177.60	45.72	64.75
100	0.59	6.83	151.90	33.48	74.13