Question: With reference to the data in Table 6.10, occasionally, caving to the coal ?rider? seam just below the limestone stratum happens at intersections of the

With reference to the data in Table 6.10, occasionally, caving to the coal ?rider? seam just below the limestone stratum happens at intersections of the 20 ft wide entries and crosscuts. Specify a cable bolt plan that will prevent these caves assuming the steel?grout interface bond strength is 750 psi. This support is in addition to the earlier roof bolting plan.

h ft (m) Co psi (MPa) T. psi (MPa) Property stratum E

h ft (m) Co psi (MPa) T. psi (MPa) Property stratum E 10psi (GPa) G 106psi Y pef (KNim) 152(24.0) 15.9 (4.8) 9.83 (67.8) 4.27 (29.4) 17.690 (122) 1.460 (10.0) (GPa) Limestone (R5) 2.780 (19.2) Coal (R4) Mudstone (R3) Sandy shale (R2) Shale (RI) Coal (Seam) Sandstone (FI) 93 (14.7) 153 (24.2) 142 (22.5) 138 (21.8) 90 (14.2) 147 (23.3) 1.4 (0.4) 0.29 (2.0) 9.8 (3.0) 7.67 (52.9) 3.07 (21.2) 13,750 (94.8) 2.7 (0.8) 4.16 (28.7) 1.79 (12.3) 6,450 (44.5) 1.3 (0.4) 3.62 (25.0) 1.53 (10.6) 16.5 (5.0) 8.6 (2.6) 8.32 (57.4) 0.12 (0.8) 390 (2.7) 1,580 (10.9) 720 (5.0) 650 (4.5) 310 (2.1) 1,350 (9.3) 7,400 (51.0) 3,400 (23.4) 12.300 (84.8) 0.35 (2.4) 0.14 (1.0) 3.35 (23.1)

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