Study on Surrounding Rock Deformation Mechanism and Control of Roadway with Large Section and Extra-Thick Top Coal

Table 1

Material parameters of each stratum in the model.

Surrounding rock	E (GPa)	υ	C (MPa)	Ψ (°)	Ρ (Kg·m^−3)	Δ (MPa)
Sandy mudstone	12.5	0.38	16.34	23.6	1950	2.52
Packsand	38.1	0.37	20.25	35.4	2550	3.81
Coal seam	5.46	0.35	5.87	15.3	1550	1.28
Medium sandstone	42.8	0.35	22.24	32.2	2650	4.18
Middle-fine sandstone	38.1	0.41	26.56	36.3	2750	5.38