There are two primary reasons why developments continue in areas with poor subgrade soil conditions. The first is the lack of space and increased pressure to develop within a particular region.
The second is for economic reasons such as road construction where it is not feasible, and may not be physically possible, to modify routes to avoid crossing areas of soft soils. This paper investigates the performance of various ground improvement methods used in construction of embankments on soft soils using three-dimensional numerical modeling.
Multiple forms of ground improvements were analyzed including deep soil mixing, light-weight fill, and stone columns. The efficiency of each type of ground improvement was evaluated based on the reduction of predicted settlement compared to a baseline model where improvements were not used.
It is suggested that the economic feasibility of ground improvements be highly dependent on the geographic location of the site; however, the gain in performance may be worth the extra material costs in some cases.
Authors: Bryson S. | El Naggar H.