The void ratio of 4 m thick consolidated clay is 1.3. The compression index and coefficient of consolidation of the clay is 0.6 and 1m²/year respectively. It is observed that the increase in vertical pressure is equal to the effective overburden pressure. Determine the change in the thickness of the clay layer (in mm).

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Consolidation parameters

Consolidation is the process of expulsion of pore water present in the voids of soil solids under the pressure of the applied load. This is a quick process in the case of coarse-grained soils since the permeability is high due to the presence of more voids, while it is a slow and gradual process in the case of clayey soil as the permeability of clay is less. An example of consolidation is the settlement of soil under a building due to the load coming from the building.