The Prediction Model of Super Large Subsidence in High Water Table Coal Mining Areas Covered with Thick Unconsolidated Layer

Table 2

Physical mechanics parameters of numerical simulation.

Lithology	Strata name	Thickness (m)	Density (kg/m^3)	Block dimension		Elastic modules (GPa)	Poisson ratio	Tensile strength (MPa)	Internal frictional angle (°)	Cohesive force (MPa)
				(m)	(m)
Soft	Unconsolidated layer	300	1800	30	15	0.18	0.30	0.002	15	0.01
	Fine sandstone	150	2396	20	10	5.72	0.24	3.1	27	8.75
	Siltstone	90	2364	20	10	5.35	0.23	8.2	31	9.57
	Sandstone	10	2394	10	5	5.75	0.24	4.2	18	6.81
	Coal seam	5	1260	5	2.5	4.32	0.22	2.2	16	1.70
	Mudstone	45	2277	30	15	5.27	0.23	3.4	32	10.24
Medium hard	Unconsolidated layer	300	1800	30	15	0.18	0.30	0.002	15	0.01
	Fine sandstone	150	2662	20	10	6.36	0.27	3.4	30	9.72
	Siltstone	90	2627	20	10	5.94	0.25	9.1	34	10.63
	Sandstone	10	2660	10	5	6.39	0.27	4.7	20	7.57
	Coal seam	5	1400	5	2.5	4.80	0.24	2.4	18	1.89
	Mudstone	45	2530	30	15	5.85	0.25	3.8	35	11.38
Hard	Unconsolidated layer	300	1800	30	15	0.18	0.30	0.002	15	0.01
	Fine sandstone	150	2928	20	10	7.00	0.30	3.7	33	10.69
	Siltstone	90	2890	20	10	6.53	0.28	10.0	37	11.69
	Sandstone	10	2926	10	5	7.03	0.30	5.2	22	8.33
	Coal seam	5	1540	5	2.5	5.28	0.26	2.6	20	2.08
	Mudstone	45	2783	30	15	6.44	0.28	4.2	39	12.52