Disaster Control of Roof Falling in Deep Coal Mine Roadway Subjected to High Abutment Pressure

Table 4

Roadway deformation in the different schemes.

No.	Roof convergence (mm)		Maximum vertical stress (MPa)		Stress concentration coefficient
	Simulated value	The ratio of the value to scheme 1	Simulated value	The ratio of the value to scheme 1
Scheme 1	132.54	1.00	32.14	1.00	1.29
Scheme 2	384.68	2.90	44.33	1.38	1.77
Scheme 3	334.56	2.52	38.44	1.20	1.54
Scheme 4	406.40	3.07	45.56	1.42	1.82
Scheme 5	506.56	3.82	48.09	1.50	1.92