Deformation Law and Control Measures of Gob-Side Entry Filled with Gangue in Deep Gobs: A Case Study

Table 1

Rock mass parameters.

Lithology	Bulk modulus (GPa)	Shear modulus (GPa)	Density (kg•m^−3)	Cohesion (MPa)	Internal friction angle (˚)	Tensile strength (MPa)
Mudstone	0.9	0.6	2600	1.5	28	0.8
Fine-grained sandstone	21.5	16	2600	3.2	35	1.8
Siltstone	5.7	4	2550	2.5	28	1.3
Coal	1.3	0.7	1350	1.7	25	0.4
Medium-grained sandstone	16	15.5	2650	3.8	35	1.9