Analysis of the Influence of Upper Protective Layer Mining on the Effect of Pressure Relief and Protection of Coal and Rock Masses between the Lower Overburden Layers

Table 3

Stress-strain relation of rock mass in the double-yield model goaf.

Strain	Stress (MPa)	Strain	Stress (MPa)	Strain	Stress (MPa)
0.01	0.37	0.07	4.00	0.13	15.9
0.02	0.79	0.08	5.01	0.14	21.2
0.03	1.26	0.09	6.25	0.15	29.7
0.04	1.80	0.10	7.79	0.16	45.7
0.05	2.42	0.11	9.75	0.17	87.5
0.06	3.15	0.12	12.3