Analysis on the Influence of Fault Protection Coal Pillar Size on Rockburst

Table 1

Rock mechanical parameters of strata.

Rock strata	Thickness (m)	Density (kg·m^-3)	Elastic modulus (GPa)	Uniaxial compressive strength (MPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)	Tensile strength (MPa)
Medium sandstone	18.4	2410	33.5	46.5	0.25	3.45	33	5.15
Mudstone and sandy mudstone	21.0	2450	38.4	50.8	0.24	4.62	35	5.62
3# coal seam	2.6	1320	3.5	16.2	0.32	1.25	30	1.45
Mudstone	10.0	2380	30.5	33.2	0.27	3.15	32	3.53