Roadway Protection by Roof-Cutting in the Support Removing Channel of the Long-Wall Mining Face

Table 1

Mechanical property parameters of the strata in the model.

No.	Lithology	Strata thickness (m)	Bulk density (kg/m^−3)	Poisson’s ratio	Bulk modulus (GPa)	Shear modulus (GPa)	Tensile strength (MPa)	Cohesion (MPa)	Friction angle (°)
1	Overlying strata	20	2550	0.21	11.49	8.26	3	3	34
2	Sandy mudstone	8	2320	0.26	9.72	5.56	2.36	3.86	32
3	Packed sand	6	2550	0.18	13.54	11.02	2.18	4.32	35
4	Mudstone	1.6	2200	0.2	5.56	4.17	1.56	1.52	30
5	Coal	0.2	1400	0.22	1.61	1.11	1.2	0.8	26
6	Gritstone	3	2400	0.29	11.11	5.43	2.36	3.86	32
7	Coal	0.35	1400	0.22	1.61	1.11	1.2	0.8	26
8	Sandy mudstone	1.5	2320	0.26	9.72	5.56	2.36	3.86	32
9	2 # coal	2.45	1400	0.22	1.61	1.11	1.2	0.8	26
10	Packed sand	2.5	2550	0.18	13.54	11.02	2.18	4.32	35
11	Mudstone	1.8	2200	0.2	5.56	4.17	1.56	1.52	30
12	Underlying strata	20	2500	0.19	10.75	8.40	3.5	4.3	32