Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams

Table 5

Cap pressures.

Strain	0.00	0.01	0.03	0.05	0.07	0.09	0.11	0.13	0.15	0.17
Stress (MPa)	0.00	0.53	1.78	3.37	5.44	8.26	12.34	18.76	30.30	57.23