Given The Geologic Column Strata Depths And Rock Properties In

Given the geologic column, strata depths and rock properties in Table 5.8, find:

(a) The maximum possible roof span when mining the lower coal seam full height,

(b) The safe roof span, if a safety factor of 4 with respect to tension is required,

(c) The factor of safety of the massive sandstone (M.S.) roof layer above the sandy shale when the layer below is at maximumspan.

Given the geologic column, strata depths and rock properties in

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