Both the bearing capacity and deformation have to be considered when the embankment is constructed on the soft foundation. Based on the main features of the soft ground in mountainous areas

using the soil-cement piles and geogrid to improve the soft foundation is an innovation. It is significant for engineering design and construction that choosing appropriate experimental measure to study this type composite foundation. Centrifugal model test was used to simulate construction course of embankment on soil-cement piles and geogrid composite foundation. Gypsum column and a type of pretensioning grid are used to simulate soil-cement pile and geogrid

respectively. Engineering characteristics of this type composite foundation were presented. The results indicate that soil-cement piles play an important role in strengthening soft foundation; and the effect of the geogrid is mainly to balance loads and constrain lateral deformation. The conclusion can be for reference in design and construction.