Soil Mechanics and Foundation Engineering - Engineering

Q1:

The angle of internal friction is maximum for

A angular-grained loose sand

B angular-grained dense sand

C round-grained dense sand

D round-grained loose sand

E clays.

ANS:B - angular-grained dense sand

Angle of internal friction is dependent to normal stress (resultant) and the friction. So the dense sand has maximum normal stress and friction is also more due to which B is the right answer. Correct me if I am wrong. Becoz angular grained soil will have more packing efficiency so it will have more internal friction.