Determination of Water-Proof Coal (Rock) Pillar Height in Mining Coal Seam Group under Water-Bearing Rock Stratum

Table 1

Mechanical parameters of coal and rock.

Rock character	Density (g·cm^−3)	Modulus of elasticity (GPa)	Uniaxial compressive strength (MPa)	Tensile strength (MPa)	Cohesive strength (MPa)	Poisson’s ratio
Mudstone	2.40	9.6	8.6	1.86	1.66	0.35
Siltstone	2.51	12.8	26.5	2.83	2.53	0.32
Fine sandstone	2.47	16.2	20.2	2.51	2.36	0.30
Glutenite	2.55	20.5	46.7	5.37	3.65	0.28
Coal	1.37	3.5	11.2	2.05	1.32	0.30