Dry Soil Mixing and Vibro Replacement in Combination for a High Embankment

Abstract

A highway between Stockholm and Nynäshamn in Sweden was constructed in a geologically sensitive area with large deposits of highly compressible clay and organic soils overlaying large deposits of silt and sand resting on bedrock. A mixed ground improvement solution, using Vibro Replacement and Dry Soil Mixing for a 7-10 m high embankment, was designed and executed. The alternative design provided both technical and production advantages to the project. This paper presents the design and execution tasks that arose during the project due to the mixing of the two different ground improvement techniques. The used design method is presented together with the monitoring results of settlements as well as the results from field tests and field trials.

Long-term reinforcement strains for column supported embankments with viscous reinforcement by FEM

“…Columns installed by the deep-mixing-method (DMM) have been widely acknowledged as a cost-effective and speedy means of supporting roadway embankments constructed over soft soil (e.g., Bergado et al, 1999;Lin and Wong, 1999;Igaya et al, 2011;Chai and Carter, 2011;Jamsawang et al, 2011;Voottipruex et al, 2011a;Chandra, 2012;Dahlstr€ om and Wiberg, 2012;Kamruzzaman et al, 2012;Bruce et al, 2013;Chai et al, 2015;Liu et al, 2015). To minimize column construction costs and improve embankment stability, geosynthetic reinforcement is increasingly used as basal reinforcement in combination with columns to control embankment deformations including both vertical and horizontal displacements (e.g., Forsman et al, 1999;Parmantier et al, 2005;Lai et al, 2006;Pooranampillai et al, 2012;Borges and Gonçalves, 2016;Chen et al, 2016;Zhang et al, 2016).…”