Fig 1.
Articulated Structure of the Fractured Rock Blocks (ASFRB).
Fig 2.
Unarticulated Structure of the Fractured Rock Blocks (UASFRB).
Fig 3.
Simplified diagram of the given load of overburden strata.
Fig 4.
Simplified diagram of the given load of loose body.
Fig 5.
Flow diagram or model selection algorithm.
Fig 6.
Coal-bearing strata in Qianjiaying coal mine.
Table 1.
Characterization of occurrence and quality of coal seams.
Fig 7.
Roof structure model of full-cover rock strata (modified according to [42]).
Fig 8.
Roof structure calculation model of MSSC in Qianjiaying coal mine.
Fig 9.
Roof structure characteristic after No.7 coal seam mining.
Table 2.
Physical and mechanical parameters of roof strata above No.7 coal seam.
Table 3.
A load of overburden strata on the main roof of No.7 coal seam.
Table 4.
Calculation parameters of SSC in No.7 coal seam.
Fig 10.
Roof structure characteristic after No.8 coal seam mining.
Table 5.
Physical and mechanical parameters of roof strata above No.8 coal seam.
Table 6.
Calculation parameters of MSSC in No.8 coal seam.
Fig 11.
Roof structure characteristic after No.12-1 coal seam mining.
Table 7.
Physical and mechanical parameters of roof strata above No.12-1 coal seam.
Table 8.
A load of overburden strata on the main roof of No.12-1 coal seam.
Table 9.
Calculation parameters of MSSC in No.12-1 coal seam.
Fig 12.
Roof structure characteristic after No.9 coal seam mining.
Table 10.
Physical and mechanical parameters of roof strata above No.9 coal seam.
Table 11.
Load and limited span result of each stratum above No.9 coal seam.
Table 12.
Calculation parameters of MSSC in No.9 coal seam.
Fig 13.
Roof structure characteristic after No.5 coal seam mining.
Table 13.
Physical and mechanical parameters of overburden strata above No.5 coal seam..
Table 14.
A load of overlying strata on the main roof of No.5 coal seam.
Table 15.
Calculation parameters of MSSC in No.5 coal seam.
Fig 14.
Shield in some typical coal seams.
(a) ZY6400-21/45 in No.7 coal seam; and (b) ZY4800-13/32 in No.8 coal seam.
Table 16.
Overview of the working faces in each coal seam.
Fig 15.
(a) No.7 coal seam; (b) No.8 coal seam; (c) No.12-1 coal seam; (d) No.9 coal seam; and (e) No.5 coal seam.
Table 17.
SSC results of field measurement in each coal seam.
Fig 16.
Compared results of the RSSC suggested and experienced selections.
Table 18.
SSC results of calculation in each coal seam.