Study on Temporal and Spatial Characteristics of Overlying Strata in the Deep Coal Mining Process

Table 1

Lithology of the adjacent strata of no. 2 + 3# coal seam.

Layer number	Main lithology	Thickness (m)
1	Siltstone	12.83
2	Fine sandstone	5
3	Siltstone	15
4	Siltstone-fine sandstone-mudstone	15
5	Mudstone-fine sandstone	15
6	Siltstone-fine sandstone	44.3
7	Mudstone-siltstone	30
8	K9 limestone	0.7
9	No. 1# coal seam	0.65
10	Sandstone-claystone	8.5
11	C2 coal seam	0.42
12	Mudstone	10
13	K8 argillaceous limestone	0.5
14	Sandstone-carbonaceous mudstone	6
15	Mudstone-argillaceous limestone	3
16	No. 2 + 3# coal seam	3.1
17	Claystone	2.8
18	Sandy mudstone	6.3
19	Graystone	2.9
20	Sandy mudstone	9.3
21	Gray claystone	2.4
22	Medium and fine sandstone	6.3