Mechanical Parameters of Deep-Buried Coal Goaf Rock Mass Based on Optimized GSI Quantitative Analysis

Table 11

Rock mass mechanical parameters of filled goafs for numerical model.

Roof strata		GSI	Deformation modulus (GPa)	Cohesion (MPa)	Friction angle (°)
9 coal roof sandstone and shale	0.46	55.0	1.49	0.22	38.5
11 coal top roof shale	0.54	59.2	2.53	0.31	37.3
11 coal lower roof sandstone	0.51	62.0	4.46	0.71	49.5
13 coal top roof shale	0.65	70.5	12.06	1.01	42.7
13 coal middle roof sandstone	0.69	73.0	18.73	1.58	50.3
13 coal lower roof limestone	0.53	64.0	12.84	0.80	48.8
15 coal roof shale	0.43	56.6	5.60	0.48	34.7