Mechanism and Control of Cable Breakage in a Roadway with Thick Top Coal in a Rockburst Mine

Table 2

Mechanical parameters of coal and rock.

Lithology	Density/kg·m^−3	Bulk modulus/GPa	Shear modulus/GPa	Friction/°	Cohesion/MPa	Tensile strength/MPa
Sandstone	2620	20.5	12.5	39	13	2.5
Siltstone	2640	16.1	10.2	35	12	1.9
Coal	1800	14.3	8.2	38	8	1.2
Mudstone	2490	15.6	8.8	36	11	2.2
Siltstone	2660	18.2	11.2	35	12	1.9