Study on Presplitting Blasting the Roof Strata of Adjacent Roadway to Control Roadway Deformation

Table 3

Overlying layers of #2 coal seam.

Location	Lithology	Thickness (m)	Remark
8	Sandy mudstone	3
7	Mudstone	1.39
6	Sandy mudstone	4.91
5	Fine sandstone	7.87	The third hard overlying layer
4	Sandy mudstone	4.25	The second hard overlying layer
3	1# coal seam	0.5
2	Fine sandstone	1.75	The first hard overlying layer
1	Siltstone	1.94