Mining Engineering > GATE 2023 > Underground Coal Mining
Strength of a rectangular coal pillar in MPa is given by
where w, l(≥ w) and h are width, length and height of the pillar, respectively. The parameter S1 is constant. A 30 m square pillar is split into two halves as shown in the figure. The height of the pillar is 3 m.
The ratio of safety factors between one half-pillar and the original square pillar is [rounded off to 2 decimal places]
The ratio of safety factors between one half-pillar and the original square pillar is [rounded off to 2 decimal places]
Explanation
Correct : 0.78
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