Mining Engineering > GATE 2025 > Subsidence Prediction
A longwall panel is to be developed in a flat seam at a depth of H m. The surface subsidence profile (s) of the area with the horizontal distance x is estimated as
s = Smax/2 [1.002-tanh(4.8x/H)]
where, Smax is the maximum subsidence at the centre of the panel, x is measured from the inflection point. The value of x is negative towards the panel centre and positive towards the panel boundary.
The ratio between the critical width of the panel and the depth is ______ (rounded off to 2 decimal places)
s = Smax/2 [1.002-tanh(4.8x/H)]
where, Smax is the maximum subsidence at the centre of the panel, x is measured from the inflection point. The value of x is negative towards the panel centre and positive towards the panel boundary.
The ratio between the critical width of the panel and the depth is ______ (rounded off to 2 decimal places)
Correct : 0.55
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