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

Table 8

Quantitative GSI values of all goaf roofs.

Roof strata		d		GSI	D	Integrity of rock mass
9 coal roof sandstone and shale	0.23	11.7	0.70	44.3	0.72	Soft rock, broken rock
11 coal top roof shale	0.29	15.7	0.70	46.8	0.69	Soft rock, broken rock
11 coal lower roof sandstone	0.43	27.6	0.77	56.6	0.54	Harder rock, broken rock
13 coal top roof shale	0.59	51.9	0.82	68.0	0.36	Harder rock, broken rock
13 coal middle roof sandstone	0.63	62.8	0.77	70.0	0.32	Harder rock, broken rock
13 coal lower roof limestone	0.34	19.5	0.80	54.0	0.58	Harder rock, broken rock
15 coal roof shale	0.43	27.6	0.76	56.6	0.70	Soft rock, broken rock