Stability Analysis and Reasonable Layout of Floor Drainage Roadway above Confined Water and under Mining Influence

Table 1

Rock mechanic parameters used in the model.

Rock stratum	Thickness (m)	Density (kg·m^-3)	Elastic modulus (GPa)	Bulk modulus (GPa)	Internal friction angle (°)	Cohesion (MPa)	Tensile strength (MPa)
Main roof	20	2500	7.60	6.50	35	13	4.5
Fine-grained sandstone	7	2500	7.60	6.50	35	13	4.5
Sandstone	5.8	2700	10.20	9.00	38	16	7.5
Sandy mudstone	6	2500	10.44	4.54	28	5.36	2.60
Mudstone	0.8	2200	8.82	5.04	30	5.24	1.48
2-1 coal	6.2	1500	5.4	4.8	25	2.8	1.5
Mudstone	7.5	2200	8.82	5.04	30	3.24	1.48
Sandy mudstone	7.5	2500	10.44	4.54	28	5.36	2.60
L9 limestone	2	2700	12.6	8.3	40	10	8.71
Mudstone	5.2	2200	8.82	5.04	30	3.24	1.48
Sandy mudstone	5.3	2500	10.44	4.54	28	5.36	2.60
L8 limestone	10	2700	12.6	8.3	40	10	8.71
Main floor	70	2700	12.6	8.3	40	10	8.71