Question: Derive a formula for the chimney cave height H shown in the sketch. Note that the initial void is roughly circular in plan and has

Derive a formula for the chimney cave height H shown in the sketch. Note that the initial void is roughly circular in plan and has a radius of a (ft, m). The circular region is h (ft, m) high. An elliptical vault forms in the back and extends b ft into the back at its highest point. Chimney caving begins from thisconfiguration.

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