Question

A dry soil sample weighing 100 g has volume of 60 ml and specific gravity 2.5. its void ratio is

Answer 1

Void ratio is defined as the ratio of the weight of water in the soil to the weight of solids in the given mass of soil.

The Specific gravity of the soil is given as = 2.5

The weight of dry soil sample = 100 gms.

The volume of the given sample = 60 ml.

Void ratio = Vw / Vs

Vs = 100 / 2.5 = 40.

So, e = 60/40 = 1.5.

The Void ratio is = 1.5.

Answer 2

weinght of sampal Wd=100g

V=60ml

specific gravity (G)=2.5

gamma of water =1

dry unit weight(gamma d)=Wd/V

=100/60

=1.6gm/cc

we know,

Dry unit weight(gamma d)=(gamma Water)×G/1+e

1.6=1×2.5/1+e

1+e=2.5/1.6

e=1.56-1

e=0.56

void ratio is e=0.56