Similar Material Simulation Study on Protection Effect of Steeply Inclined Upper Protective Layer Mining with Varying Interlayer Distances

Table 1

Related physicomechanical parameters for each stratum.

Stratum number	Lithology	Volume weight (MN·m^−3)	Elastic modulus (GPa)	Poisson’s ratio	Tensile strength (MPa)	Compressive strength (MPa)
1	Limestone	0.028	30.2	0.26	9.8	107.35
2	Allitic shale	0.024	23.3	0.30	6.6	91.00
3	C6 coal seam	0.014	0.91	0.35	0.4	3.98
4	Calcareous shale	0.025	26.4	0.23	8.7	103.35
5	Silty shale	0.024	23.1	0.28	9.8	107.35
6	Limestone	0.028	30.2	0.26	9.8	107.35
7	Silty shale	0.024	27.6	0.28	6.6	88.71
8	Cherty limestone	0.029	35.3	0.23	21.2	185.26
9	Silty shale	0.024	20.1	0.28	9.8	107.35
10	C4 coal seam	0.014	0.94	0.38	0.3	3.38
11	Siltstone	0.030	21.6	0.25	7.3	104.57
12	Limestone	0.028	30.2	0.26	9.8	107.35