New Study Results the Secondary Settlement for Vertical Total Stress on   Highway Construction built on Soft Ground in the Mekong Delta
  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. 
Hung Pham Van
physics.geo-ph