Consider the geologic column and properties given in Table 5.1 for entries developed on strike at a depth of 1,450 ft (442 m) in strata dipping 8?. Determine the potential for bed separation in the roof rock, that is, find any separation horizons. Mining height is 12 ft (3.7 m).

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To (102) psi (MPa) E (106) psi (GPa) Co (103) Rock type Unit Y-pef (kNim) h-ft (m) v(-) psi (MPa) 11.2 (77.2) 6.0 (41.4) 0.35 (2.4) 7.5 (51.7) 155 (24.5) 138 (21.8) 2.5 (17.2) 90 (14.2) 0.35 (2.4) 142 (22.5) 10.3 (7.1) 4.0 (2.8) 0.25 (0.2) 6.2 (4.3) Sandstone R5 R4 R3 4.7 (32.4) 0.25 8.9 (2.71) 3.6 (1.10) 0.5 (0.15) 2.5 (0.76) Shale Coal 0.20 0.31 Laminated R2 3.1 (21.4) 0.18 sandstone Shale 6.0 (41.4) 4.0 (2.8) 0.35 (2.4) 0.25 (0.2) 11.2 (77.2) 10.3 (7.1) 13.1 (90.3) 15.2 (10.5) 1.5 (0.46) 16.8 (5.12) 4.7 (1.43) 7.9 (2.41) RI 138 (21.8) 2.5 (17.2) 0.2 90 (14.2) 0.35 (2.4) 0.31 155 (24.5) 4.7 (32.4) 0.25 148 (23.4) 6.0 (41.4) 0.21 Coal Seam FI F2 Sandstone Claystone