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If the soil sample has porosity of 30% and specific gravity of solids G=2.7, then its dry unit weight will be ______

a) 18.350 kN/m3
b) 18.535 kN/m3
c) 18.640 kN/m3
d) 18.545 kN/m3

Answer: b
Explanation: Given,
Porosity n=30%=0.3
Specific gravity G=2.7
Voids ratio e = n / (1-n)
e=0.3/(1-0.3)=0.429
Dry unit weight γd = Gγw/(1-e)
γd=(2.7*9.81)/(11+0.429)
γd=18.535 kN/m3.

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