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

Table 4

Influence of hydraulic pressure on the overlying strata structure stability.

Hydraulic pressure (MPa)	Overlying load (MPa)		Displacement (mm)		Fracture height (m)
	Key strata	Lower water-resisting	Key strata	Lower water-resisting
4.5	5.41	4.47	3968.00	3877.00	55.00
2.5	3.43	2.51	3916.00	3702.00	55.00
2.0	0.47	2.16	393.00	115.90	32.50
0.5	0.58	2.20	371.30	83.94	32.50