Question: With reference to the sketch, a bolting plan consisting of 5/8 in. (1.59 cm) diameter mechanically point anchored bolts spaced on 4 ft centers (1.22

With reference to the sketch, a bolting plan consisting of 5/8 in. (1.59 cm) diameter mechanically point anchored bolts spaced on 4 ft centers (1.22 m), square pattern, is proposed. Evaluate this plan from the dead weight view. Show why the plan is adequate or not, assume high strength. Would 3/4 in. (1.91 cm) diameter bolts on 5 ft (1.52 m) centers be adequate? Which Plan is preferable? Note: Spacing from the rib is one-half boltspacing.

Surface Overburden E-10 psi (GPa) 7-pcf(kN/m) h -in. (cm) R5 Shale 5

Surface Overburden E-10 psi (GPa) 7-pcf(kN/m) h -in. (cm) R5 Shale 5 59(150) 8.0(55.2) 160(25.3) 1.0(6.90) 7(17.8) R4 Shale 4 135(2.14) 1.0(6.90) 135(2.14) 8(20.3) R3 Shale 3 1.0(6.90) 135(2.14) 10(25.4) R2 Shale 2 1.0(6.90) RI Shale I 135(2.14) 12(30.5) Seam FI Sandstone

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