Investigation on Mining-Induced Floor Water Inrush from Column and Its Control Based on Microseismic Monitoring

Table 2

Physical and mechanical parameters of coal and rock.

Strata	Density (10^3 kg/m^3)	Elastic modulus (GPa)	Poisson’s ratio	Internal friction angle (°)	Cohesion (MPa)	Tensile strength (MPa)
Sandy mudstone	2.60	25.92	0.26	30	9.13	1.45
Limestone	2.53	29.45	0.15	31	16.25	3.79
Shale	2.61	34.30	0.18	34	20.00	3.00
Coal	2.49	34.59	0.20	33	15.00	3.70
Sandstone	2.50	36.70	0.16	32	14.40	2.69