At a point in a saturated normally consolidated clay layer the soil is subject to an in-situ vertical effective stress of 50kPa. The soil at the point has a moisture content of 44% and a compression index of 0.45. The effective stress at the point is to be rapidly increased to 120kPa.
a) What would be the void ratio of the clay at the point immediately after increasing the stress?
b) What would be the void ratio at the point a long time after increasing the stress?