Abstract
Stiffened Deep Mixed (SDM) column is a new ground improvement technique which can be used to significantly increase bearing capacity and reduce settlement of soft soil. In the region consisting of deep thick saturated soft soil, SDM columns have been successfully used to support highways and railway embankments, tanks, and buildings. However, there still has been no feasible method in design of SDM column-reinforced subsoil so far. This paper proposed a method to calculate settlement of SDM columns-supported embankment over soft soil. The total settlement of SDM column-reinforced soft soil is a sum of the compression of the soil within length of stiffened core piles, the compression of the soil from core pile tip to SDM column base and the compression of the soil below SDM column base. Punching effect was considered in developing the method to consider the punching deformation of core pile upward and downward. A full scale test was introduced to verify the feasibility of the proposed method and it yielded a good prediction with the field data.
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