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A soil has a void ratio of 0.6 and a specific gravity of solids as 2.7. What will be its dry unit weight?

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in Geotechnical Engineering I by (102k points)
A soil has a void ratio of 0.6 and a specific gravity of solids as 2.7. What will be its dry unit weight?

(a) 15.5 kN/m^3

(b) 16 kN/m^3

(c) 16.5 kN/m^3

(d) 17 kN/m^3

The question was posed to me at a job interview.

This is a very interesting question from Functional Relationships in division Preliminary Definitions and Relationships of Geotechnical Engineering I

1 Answer

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Best answer
Right option is (c) 16.5 kN/m^3

Easy explanation: Given,

Voids ratio e=0.6

Specific gravity G=2.7

Dry unit weight γd = (G* γw/1+e)

Unit weight of water γw=9.8 kN/m^3

γd = (2.7*9.81)/(1+0.6)

γd = 16.5 kN/m^3.

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