There are many classifications of soil in the field of soil mechanics. However, most of them are related to materials of earth constructions such as embankments, roads, dikes etc..
In the application of soil stabilizations to a soft ground, it is required to know the natural state of its ground in addition to its soil classification since soil stabilizations as an artificial action are applied to a soft ground in its natural state. Several methods to represent the natural state of ground are discussed in this paper, namely, (1) area coordinates, (2) indication by pF-scale and (3) indication by consistency index.
By analyzing various soil stabilizations done in situ on the basis of both the conventional classifications and the proposed methods, it was found that there were significant correlations among the characteristics of stabilized ground, the stabilizing method, the kind of soil and the natural state of the ground.
On the basis of the relationships obtained, it seems possible to select an optimum soil stabilization suitable for a ground by primary survey of the ground.