Research on Surface Failure Law of Working Faces in Large Mining Height and Shallow Buried Coal Seam

Table 3

Rock mechanics parameters in numerical simulation.

No.	Lithology	Thickness (m)	Tensile strength (GPa/MPa)	Modulus of elasticity (MPa/GPa)	Density (kg·m^−3)
45	Loess strata	11	—	—	1643
44	Sandy mudstone	5	1.59	1.34	2280
43	Siltstone	2	2.97	2.16	2312
42	Sandy mudstone	3	3.09	2.63	2287
41	Siltstone	1	2.86	1.92	2309
40	Sandy mudstone	2	2.41	4.19	2325
39	Mudstone	4	2.52	4.2	2323
38	Siltstone	2	2.56	4.51	2282
37	Sandy mudstone	6	2.58	4.83	2345
36	Coarse-grained sandstone	14	1.08	2.08	1997
35	Medium-grained sandstone	4	1.65	2.95	2111
34	Sandy mudstone	3	3.95	7.72	2318
33	Coarse-grained sandstone	2	4.68	5.68	2372
32	Sandy mudstone	5	5.37	7.72	2352
31	Fine-grained sandstone	2	2.75	35	2593
30	Siltstone	8	3.73	6.92	2367
29	Sandy mudstone	3	4.4	5.53	2405
28	Sandy mudstone	2	5.66	6.15	2363
27	Siltstone	3	3.73	6.92	2367
26	Sandy mudstone	3	6.54	12.4	2606
25	Fine-grained sandstone	3	5.35	10	2343
24	Sandy mudstone	3	6.54	12.4	2606
23	Siltstone	2	3.73	6.92	2367
22	Argillaceous sandstone	7	5.75	7.5	2366
21	Fine-grained sandstone	2	3.56	4.19	2263
20	Mudstone	4	5.2	8.21	2374
19	Fine-grained sandstone	4	5.71	16.3	2295
18	Fine-grained sandstone	3	6.01	15.6	2406
17	Sandy mudstone	2	6.79	6.8	2425
16	Siltstone	2	6.27	11.7	2403
15	Sandy mudstone	4	5.47	6.08	2446
14	Siltstone	6	8.08	15.7	2494
13	Medium-grained sandstone	5	5.62	9.78	2256
12	Siltstone	1	7.21	9.3	2387
11	Sandy mudstone	4	5.6	7.7	2482
10	Fine-grained sandstone	31	4.93	14.1	2360
9	Siltstone	4	9.26	14	2430
8	Coal 5–2	7	1.08	2.08	1290
7	Siltstone	4	7.84	12.9	2512
6	Sandy mudstone	3	8.58	11	2482
5	Siltstone	4	7.22	18.5	2546

Groups 1, 2, 3, and 4 are the groups of scaffolds in the simulation.