Stability Analysis of Support Anchor Bolt in the Process of Surrounding Rock Fracture Evolution

Table 1

Mechanical parameters of rock and coal of numerical model.

Rock properties	Density (kg·m^-3)	E (MPa)		Compressive strength (MPa)	Thickness (m)	(°)
Sandstone	2760	28000	0.14	105.2	6.7	35
M8 coal	1350	500	0.2	15	0.5	25
Siltstone with mud	2690	18000	0.16	41.4	6	32
Carbonaceous mudstone	1650	600	0.24	16	0.5	25
Siltstone with mud 2	2680	4000	0.18	35	4.5	30
M9 coal	1800	1440	0.20	20	2.8	25
Siltstone	2800	8000	0.14	95.2	6	35