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Question

What is the dry unit weight of a clay soil when the void ratio of a sample there of is 0.50, the degree of saturation is 70% and the specific gravity of soil grains is 2.7? Take the value of γw to be 9.81kN/m3.

A

13.651kN/m2

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B
19.951kN/m2
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C
23.651kN/m2
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D
29.95kN/m2
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Solution

The correct option is B 19.951kN/m2
(b)
Bulk unit weight ; γb=(G+Se)γw1+e

=2.7+0.4×0.51+0.5

=19.47kN/m3

Se = wG

water content
w=0.7×0.52.7=0.12962

γd=γb1+w=19.9471+0.12962

=17.658kN/m3

Note : Dry unit weight has been asked but no answer is matching. But bulk unit weight is matching.

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