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For an anisotropic soil ________ is true.

(a) kx≠ky

(b) kx+ky=0

(c) kx-ky=0

(d) kx/ky=1

The question was posed to me in an online quiz.

The above asked question is from Seepage through Anisotropic Soil topic in portion Seepage Analysis of Geotechnical Engineering I

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Correct answer is (a) kx≠ky

For explanation: In an isotropic soil kx=ky=k. But for anisotropic flow medium is kx≠ky. The laplace equation is \(k_x\frac{∂^2 h}{∂x^2}+k_y\frac{∂^2 h}{∂y^2}=0.\)

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