Consider a rectangular entry 3.66 m high and 6.71 m wide that is driven at a depth
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Consider a rectangular entry 3.66 m high and 6.71 m wide that is driven at a depth of 290 m. The immediate roof layer which is 0.69 m thick separates from the layers above. Layer properties are E = 25.52GPa, ν = 0.28, γ = 21.2kN/m3, To = 4.7 MPa. Find the maximum tensile stress σt , maximum sag w max and safety factor with respect to tensile failure Ft if
(a) The roof ends are simply supported and
(b) The ends are built-in.
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Given Entry 366 m high x 671 m wide depth 290 m immediate roof layer separation h 069m E2552 ...View the full answer
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