Research on Fault Activation Law in Deep Mining Face and Mechanism of Rockburst Induced by Fault Activation

Table 1

Physical and mechanical parameters of surrounding rock.

Location	Lithology	Thickness (m)	Shear modulus (GPa)	Bulk modulus (GPa)	Density (kg · m^−3)	Cohesion (MPa)	Internal friction angle (°)
Main roof	Medium-grained sandstone	48.74	13.12	15.71	2500	5.4	35
Immediate roof	Siltstone	21.67	4.64	4.38	2600	1.1	33
Working face	Coal seam	9.00	0.38	0.55	1350	0.9	29
Immediate floor	Medium-grained sandstone	21.59	13.12	15.71	2500	5.4	35
Main roof	Coarse-grained sandstone	39.50	15.65	19.24	2700	6.5	37