e void ratio e 0 in situ void ratio σ ′...

e	void ratio
e₀	in situ void ratio
$σ'_{p}$	preconsolidation pressure measured under laterally constrained compression
$σ'_{pI}$	preconsolidation pressure measured in compression under equal all around pressure
$σ'_{v}$	effective vertical stress
$σ'_{v 0}$	effective overburden pressure