The degree of saturation is the ratio of the volume of water to the volume of voids. Consolidation happens when the soil is in a fully saturated condition. That is, after all, air from voids got expelled by compaction of soil it will be fully saturated and then the consolidation starts. Thus as the volume of water reduces by consolidation, the volume of voids also reduces at the same rate. So there will be a constant degree of saturation. Finally, almost all water gets expelled out and the volume of voids will become negligible and then the plastic rearrangement of soil particles (secondary consolidation) will take place.

**Bryan Stanley**

Design Engineering