New Method to Design Coal Pillar for Lateral Roof Roadway Based on Mining-Induced Stress: A Case Study

Table 1

Model parameters.

Rock layer	Elastic modulus (GPa)	Poisson's ratio	Friction angle (°)	Tensile strength (MPa)	Cohesive strength (MPa)
Siltstone	18.5	0.20	35	4.80	5.70
Medium grained sandstone	17.8	0.25	32	3.37	3.67
Silty mudstone	14.0	0.28	28	2.85	3.50
Mudstone	3.5	0.32	25	1.50	3.25
Coal seam	2.5	0.32	22	1.05	1.75