Concept: Compression Index: For normally consolidated soil, the slope of void ratio (e) v/s logarithm of effective stress (log σ’v ) curve is called compression index.
Mathematically compression index is given by, CC=
e1−e2
log(
σ2
σ1
)
where e1 = void ratio at effective stress σ1′ and e2 = void ratio at effective stress σ2′ Calculation: 0.28=