  Today, to calculate secondary settlement for vertical total stress by the
analytic formula, we often use the formula of Raymond and Wahls (1976) This
formula does not reflect that the secondary settlement for vertical total
stress depends on the magnitude of the vertical total stress which impact
sinkage in soft soil, and changes with depth and preconsolidation pressure. As
a result, soft soil creep, resulted from the soft soil's vertical total stress,
under road and highway at different depths will be different. The problems were
solved in this article.
