Study on Stability Control of Retained Gob-Side Entry by Blasting Fracturing Roof Technology in Thick Immediate Roof

Table 4

Rock mass mechanical properties used in numerical simulation.

Lithology	GSI	m	D	E (GPa)	K (GPa)	G (GPa)	Ф (deg.)	C (MPa)
Silty mudstone	60	15	0.7	6.22	4.94	2.41	34	1.1	0.29
Fine sandstone	70	17	0.7	19.1	12.2	7.70	47	2.4	0.24
Pelitic siltstone	60	10	0.7	8.21	6.22	3.21	35	1.23	0.28
Coal	40	8	0.7	1.1	1.02	0.42	14	0.33	0.32
Mudstone	45	10	0.7	2.24	1.87	0.86	22.1	0.589	0.3
Medium fine sandstone	56	15	0.7	5.77	4.01	2.29	34.6	1.31	0.26