Mohammad Mehdi Pardsouie - PhD candidate, Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.
Mohammad Hadi Pardsouie - Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.
Seyed Mohammad Zomorodian - Associate professor, Department of Water Engineering, Faculty of Agriculture, Shiraz University, Shiraz, Iran.
Mehdi Mokhberi - Assistant professor, Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.

This paper describes the behavior of soft soil foundation under Surcharge and with and Without prefabricated vertical drains (PVDs) or Vacuum Preloading base on a trial embankment which was built in Bangkok International Airport, Thailand. An analytical solution considering the variation of soil permeability and compressibility was adopted. Three scenarios were modeled and analyzed for Bangkok airport as: Model A: Application of surcharge load alone (i.e., no vacuum and PVD installation), Model B: Application of surcharge load combined with PVD (i.e., no vacuum application), Model C: Application of surcharge load combined with PVD and ۶۰ kpa constant vacuum preloading and Model D: Application of surcharge load combined with PVD and field vacuum that was applied on site. The associated settlements at the embankment centerline are predicted and compared with the available field measurement. The field data show that the efficiency of this soil treatment technique depends on the magnitude and distribution of vacuum pressure. The height of surcharge and consolidation time can be significantly reduced in comparison with the conventional method of surcharge alone or surcharge and pvd alone. The findings of this study are expected to be useful to design engineers involved in the construction of embankments on weak grounds.

surcharge, Soil treatment, vacuum consolidation, PVD