Civil Engineering - Soil Mechanics and Foundation Engineering - Discussion

Coefficient of compressibility is the negative ratio of decrease in void ratio (i. E volumetric strain) to the increase in effective stress.

Increase in load will result in a decrease in void ratio and an increase in effective stress. The graph between void ratio and effective stress will be a parabolic curve with concavity upwards. The slope of this curve i.e. void ratio (y) /effective stress (x) will be negative. Hence the negative sign which will make the coefficient positive.

It is the ratio of change in void ratio to change in stress. As void ratio changes the volume Will also change.

Hence it is the ratio of volumetric strain to stress.

Compressibility is the inverse of bulk modulus of elasticity that's why it is a strain to stress.

The ratio of how much strain coming to soil for unit stress is known as compressibility.

Co.eff of Compressibility is the reciprocal of young modulus.

Coefficient Of compressibility is the ratio of change in the void to change in effective stress.

Change in voids ratio is considered as strain. The strain is nothing but change in the dimension per unit original dimension.

It is the ratio change in decrease void ratio to per unit Chang in increase pressure.

Soo, void ratio denoted volumetric strain.
And pressure as denoted stress.

Answer. Strain to stress.

Decrease in void ratio to increase in stress.

Yes, agree Strain to stress is the right answer.