With reference to Problems 19 and 20, suppose the pillars are 9 9 m and that
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With reference to Problems 19 and 20, suppose the pillars are 9 × 9 m and that a size effect exists such that Cp = C1 (0.78 + 0.22Wp/Hp). If the mining height changes from 8 to 27 m as a sill between two ore horizons is removed, what is the resulting pillar safety factor, all other parameters remaining the same? What is the pillar safety factor if the size effect is neglected?
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Given Problems 19 20 data pillars 9x9m Cp C 078 022 WpHp Hp 1 8 m ...View the full answer
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