Research on Technology of Supporting in Super-Large Section Cut in Working Face with Large Mining Height

Table 1

Mechanical parameters of rock and coal in the calculation model.

Rock formation name	Density (kg m^−3)	Shear modulus (GPa)	Bulk modulus (GPa)	Cohesion (MPa)	Internal friction angle(°)	Tensile strength (MPa)
Medium sandstone	2420	9.477	10.264	12.18	40.33	3.536
Coarse sandstone	2392	4.450	5.632	8.37	44.52	1.758
2-1 coal	1450	2.130	6.389	4.2	32	1.050
Sandy mudstone	2560	3.23	4.18	6.51	36	1.12
Mudstone	2593	2.02	3.70	5.01	38	0.64