Publication Abstract

Proceedings-DFI/EFFC 11th International Conference on Piling and Deep Foundations, 2014, Stockholm, Sweden, (DFI)

A Case Study on the Effects of Using Surcharge Fill as a Complement to Ground Improvement with Dry Deep Mixing
Stefan Larsson, KTH Royal Institute of Technology, Sweden; Sadek Baker and Razvan Ignat, Skanska Sverige AB, Sweden; Sebastian Adevik, ELU Consultant, Sweden

Uncertain strength, deformation and flow properties in dry deep mixing columns often lead to conservative choices concerning design values where the design is regularly complemented with a surcharge fill. The surcharge not only leads to increased cost but also to logistical problems where the surcharge is a physical obstacle. The deformation properties of a ground improvement were studied by means of two small embankment load tests. The settlement measurements were also used in FEM analyses, where the effect of surcharge on creep settlements was investigated. Based on the results, the effects of the surcharge were considered negligible and could safely be ignored. The project is an example how the contractor can use a field test as an effective design approach.

 article #1938; publication #100 (IC-2014)