Control of the Internal and External Staggered Distance of Coal Mining Face to the Water-Conducting Fissures in the Overlying Strata of the Near Coal

Table 1

The overburden parameters.

Serial number	Lithology	Thickness	Remarks
1	Loose layer	5
2	Loess	6	Water barrier
3	Sandy mudstone	6
4	Silt sandstone	7
5	Medium-grained sandstone	3
6	Fine-grained sandstone	16	Thick hard rock
7	Sandy mudstone	6
8	Medium-grained sandstone	9
9	Silt sandstone	7
10	Coarse-grained sandstone	3
11	Medium-grained sandstone	10	Basic top
12	Sandy mudstone	5
13	Upper seam	2.5
14	Silt sandstone	7
15	Medium-grained sandstone	14
16	Coarse-grained sandstone	10
17	Lower coal seam	3
18	Fine-grained sandstone	5