Study on Reasonable Roadway Position of Working Face under Strip Coal Pillar in Rock Burst Mine

Table 2

Mechanical parameters of coal and rock formations.

No.	Lithology	Bulk modulus (GPa)	Shear modulus (GPa)	Tensile strength (MPa)	Friction angle (°)	Cohesion (MPa)
1	Sandy mudstone	2.5	1.39	0.8	30	2.0
2	Siltstone	9.66	11.48	1.2	33	3.4
3	Fine sandstone	9.20	7.20	1.3	30	4.2
4	coal	1.8	2.75	0.7	25	2.0
5	Coarse sandstone	9.23	8.10	1.1	26	5.5
6	Mudstone	2.5	1.39	0.8	30	2.0
7	Medium sandstone	10.22	11.52	1.6	35	2.6