Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on In Situ Stress Measurement

Table 4

Physical and mechanical parameters of the model strata.

Lithology	ρ (kg·m^−3)	E (GPa)	ν	G (GPa)	K (GPa)	C (MPa)	φ (°)	σtm (MPa)
Loess	1600	0.30	0.31	0.26	0.11	0.03	13.00	0.03
Gravelly coarse sandstone	2428	1.31	0.29	1.04	0.51	5.40	35.10	0.79
Siltstone 1	2226	1.43	0.33	1.40	0.54	6.58	30.24	0.75
Sandy mudstone 1	2228	1.18	0.31	1.04	0.45	6.90	27.64	1.39
Coarse sandstone	2224	1.79	0.31	1.57	0.68	8.83	25.89	1.81
Medium sandstone	2347	6.37	0.29	5.06	2.47	14.80	30.75	3.16
Fine sandstone 1	2329	6.98	0.31	6.12	2.66	14.60	30.00	3.28
Sandy mudstone 2	2322	7.06	0.29	5.60	2.74	11.10	33.27	1.35
22# coal seam	1400	4.08	0.28	3.09	1.59	1.13	25.00	0.82
Fine sandstone 2	2177	6.71	0.31	5.89	2.56	10.80	35.60	1.82
Sandy mudstone 3	2351	9.44	0.25	6.29	3.78	23.03	28.07	5.08
42# up coal seam	1320	4.62	0.31	4.05	1.76	4.21	26.10	0.55
Fine sandstone 3	2318	7.80	0.31	6.84	2.98	18.20	32.25	4.24
Sandy mudstone 4	2383	10.48	0.22	6.24	4.30	24.50	26.50	5.07
Siltstone 2	2334	8.86	0.30	7.38	3.41	17.65	31.05	3.45