A rectangular shaft 18 ft by 24 ft is planned for a depth of 4,800 ft where
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A rectangular shaft 18 ft by 24 ft is planned for a depth of 4,800 ft where the premining stresses relative to compass coordinates (x = east, y = north, z = up) are given by: σxx = 250 + 0.5h, σyy = 800 + 0.2h, σzz = 1.1h, where h is depth and compression is positive. Find the best shaft orientation (explain), then determine if shaft wall support is needed at some depth. Wall rock properties are: E = 6.2 million psi, ν = 0.33, c (cohesion) = 5,600 psi, φ = 52◦, γ = 158pcf.
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Given Rectangular shaft 18 x 24 at 4800 0xx 750 05h dyy800 02h Ozz 11h E 62106 psi v 033 c ...View the full answer
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