The Study of Key Stratum Location and Characteristics on the Mining of Extremely Thick Coal Seam under Goaf

Table 2

Rock formation columnar section of #13 coal seam in Xiegou coal mine.

No.	Name	Thickness (m)	Elasticity modulus (GPa)
1	Loess	26.84	0.25
2	Packsand	7.95	4.03
3	Sandy mudstone	12.18	5.44
4	Packsand	8.50	13.25
5	Sandy mudstone	20.30	10.63
6	Medium sandstone	12.06	33.37
7	Sandy mudstone	31.49	6.22
8	Packsand	4.60	12.58
9	Sandy mudstone	21.85	6.45
10	Mudstone	25.22	3.61
11	Sandy mudstone	3.60	9.75
12	Medium sandstone	17.30	15.37
13	Sandy mudstone	6.50	8.53
14	Packsand	13.76	17.74
15	Mudstone	6.56	5.47
16	Packsand	3.82	8.36
17	Mudstone	4.52	2.60
18	Medium sandstone	7.84	12.79
19	Sandy mudstone	4.12	7.53
20	Packsand	7.02	6.43
21	Sandy mudstone	9.51	9.59
22	Medium sandstone	11.92	26.32
23	Mudstone	15.02	4.51
24	#6 coal mine	1.50	0.99
25	Gritstone	9.65	24.32
26	Siltstone	3.71	9.10
27	Sandy mudstone	1.00	8.57
28	#8 coal mine	5.69	2.15
29	Mudstone	2.13	3.64
30	Medium sandstone	8.31	28.45
31	Marlstone	2.12	17.56
32	Mudstone	2.01	6.52
33	#9 coal mine	0.51	0.55
34	Sandy mudstone	2.43	10.29
35	Mudstone	1.45	2.58
36	Gritstone	5.39	19.57
37	Mudstone	2.32	3.85
38	#10 coal mine	0.60	0.66
39	Mudstone	2.26	4.68
40	Marlstone	6.50	15.68
41	Sandy mudstone	1.53	9.74
42	#11 coal mine	0.61	1.02
43	Mudstone	1.76	2.85
44	Limestone	2.56	6.37
45	Sandy mudstone	2.08	10.24
46	Mudstone	1.49	4.39
47	#12 coal mine	0.82	1.20
48	Mudstone	1.00	3.80
49	Medium sandstone	2.50	17.68
50	Micropsammite	2.02	3.51
51	Mudstone	2.07	2.67
52	Sandy mudstone	1.50	10.85
53	#13 coal mine	5.25	1.36
54	Dirt band	0.25	2.23
55	#13 coal mine	3.25	1.25
56	Dirt band	0.25	2.64
57	#13 coal mine	4.15	1.48
58	Dirt band	0.30	2.47
59	#13 coal mine	1.55	1.12
60	Mudstone	2.00	3.62
61	#14 coal mine	0.33	0.85
62	Mudstone	3.05	2.48
63	Sandy mudstone	2.00	8.62
64	Limestone	1.29	6.34
65	Mudstone	1.00	4.58
66	#15 coal mine	0.44	0.63
67	Sandy mudstone	3.00	7.25
68	Mudstone	2.05	4.26
69	Siltstone	2.56	13.48
70	Packsand	2.41	7.68