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Foundation Engineering

Passive Pressure II

For a sand ha...

Question

For a sand having an internal friction of $30^{\circ},$ the ratio of passive to active lateral earth pressure

A

1

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B

3

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C

6

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D

9

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Solution

The correct option is D 9
$\frac{K_{p}}{K_{a}} w i l l b e t h e r a t i o o f p a s s i v e t o a c t i v e e a r t h p r e s s u r e .$
$\frac{K_{p}}{K_{a}} = {(\frac{1 + sin ϕ}{1 - sin ϕ})}^{2} = (\frac{1 + sin 30^{\circ}}{1 - sin 30^{\circ}}) = 9$

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