Long-term settlement estimation of very soft ground which is treated with the vacuum consolidation method

- FEM analysis for the trial embankment in “Hakuryuko” area -

Abstract

The ground layers of a section from Nanyo-Takahata IC to Yamagata-Kamiyama IC in the Tohoku Chuo Expressway is very soft includes mainly organic soil layers. Therefore, surrounding ground deformation and long term settlement by road embankment construction were predicted. To reduce these deformation and settlement, vacuum consolidation method was examined as a countermeasure, and trial embankment was carried out to confirm the improvement effect of this method.
This paper describes the study on the two-dimensional soil-water coupled FEM analysis result and 20 years long term settlement estimation for this trial embankment.