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GATE Exam Questions - Engineering

Q1:

A soil mass has coefficients of horizontal and vertical permeability as 9 x 10-7 cm/s and 4 x 10-7 cm/s, respectively. The transformed coefficient of permeability of an equivalent isotropic soil mass is

A 9 x 10-7 cm/s

B 4 x 10-7 cm/s

C 13 x 10-7 cm/s

D 6 x 10-7 cm/s

ANS:D - 6 x 10-7 cm/s

It is derived based on Laplace equation for anisotropic soil keeping the depth of soil sample is constant and width is changing. The resulting answer is k' =√(kx*ky).