Study on Overburden Stability and Development Height of Water Flowing Fractured Zone in Roadway Mining with Cemented Backfill

Table 3

The limited span and deflection of overlying strata.

Layer number	Lithology	Layer thickness (m)	Limited span (m)	Limited deflection (mm)
3	Glutenite	20	31.3	0.86
4	Sandy mudstone	5.69	21.1	1.63
5	Glutenite	27.3	38.3	1.05
6	Coal	3.07	19.2	3.16
7	Glutenite	21.97	33.3	1.56
8	Coal	2	15.3	2.85
9	Sandy mudstone	15	31.3	1.23
10	Coal	2.5	17.4	3.56
11	Sandstone	8.8	31.6	1.23
12	Glutenite	4.2	21.9	2.22