Mechanical Analysis of Mining Stress Transfer on Isolated Island Face in Extra-Thick Fully Mechanized Top-Coal Caving Mining

Table 1

Mechanical parameters of coal–rock.

Medium name	Shear modulus (GPa)	Bulk modulus (GPa)	Cohesion (MPa)	Friction angle (°)	Tensile strength (MPa)
Medium fine sandstone	1.62	1.71	2.6	35	0.62
Bedrock	1.04	1.14	3.3	33	0.82
Sandy mudstone	0.91	0.86	3.3	37.5	2.25
Coal seam	0.67	0.50	1.3	28	0.54
Fine sandstone	1.04	1.14	3.3	33	0.82
Coarse sandstone	1.54	1.68	3.3	35	0.40
Mudstone	2.04	2.15	1.6	37.4	0.41