Determination of Reasonable Width of Filling Body for Gob-Side Entry Retaining in Mining Face with Large Cutting Height

Table 1

Mechanical parameters of rock mass.

Rock name	Density (kg·m^-3)	Bulk modulus (Gpa)	Shear modulus (Gpa)	Cohesion (Mpa)	Tensile strength (Mpa)	Internal friction angle (°)
Mudstone	2 350	2.10	1.95	1.5	1.400	32
Fine-grained sandstone	2 600	1.89	1.20	8.3	1.252	35
Coal 2#	1 400	0.72	0.58	1.3	0.325	30
Sandy mudstone	2 600	1.34	1.00	8.2	1.025	36
Coal #	1 400	1.44	1.38	1.3	0.200	30
Siltstone	2 800	4.90	4.67	1.2	1.000	36
Coal 5#	1 400	1.44	1.38	1.3	0.200	30
Limestone L5	2 730	1.21	1.20	6.3	1.119	40
Coal 6#	1 400	1.44	1.38	1.3	0.200	30
Medium sandstone	2 600	2.67	1.12	8.0	3.170	35
Carbonaceous sandstone	2 520	1.86	1.15	1.4	1.790	33
Filling body	2 950	2.60	1.70	3.0	1.650	34
Overlying strata	2 500	2.28	1.80	6.0	1.550	33