Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past.
How far in the past does the soil remember its loading/the pressure it sustained?
In other words, suppose that at a certain time the Preconsolidation pressure of a soil is $p_0$ due to certain load it had bore in the past. Then does the Preconsolidation pressure $p_0$ changes as the time passes given that the soil is left undistrubed?
