Calculations:-

a) The axial strain, ϵ% =(∆L/Lo)×100

Where, ∆L = change in length of specimen.
Lo = Initial length of specimen.

b) Corrected areaA,

A = Ao/(1-ϵ)
Where, Ao = initial sectional area op the specimen.

c) Compressive stress, (which is the principal stress) is σ1= P/A where P = axial load.
A plot of σ1versus Ԏ gives the maximum stress, which is the unconfined compressive strength of the soil specimen.

Observations and tabulation:-

Initial data available

a) Do = cm, L = cm, Ao =cm²

b) Initial bulk density, ρt =gm/cm³

c) Initial water content,w= %

Table : Data Sheet for Sample 1

Strain dial reading	ΔL(mm)	Axial Strain %	Correcte d area, A(cm2 )	Proving ring reading (PR)	Axial Load P(kg)	Stress σ=P/A (kg/cm2 )