Soft estuarine clays are found in many expressway and motorway projects in Queensland, Australia. The strengths of these
clays are very low and as such embankment failures can be encountered during construction. Presently, there are very few case studies
presenting projects on estuarine clay in Australia. This paper presents the details of a trial embankment with stone columns in Southeast
Queensland, Australia. The trial embankment incorporated 3 separate sections i.e. 2 sections with stone columns of 2m and 3m
spacing (square pattern), and a section without stone column. It was constructed on estuarine clay with high sensitivity. Undrained
shear strength measured from field vane tests varied with depth, ranging from 5 to 20 kPa. Further, the sensitivity of the estuarine clay
reduces with depth, ranging from 5 to 12. Analysis of this case study was undertaken using field measurements. The pore pressures responses
and deformations below the embankment were investigated. The effectiveness of stone column is also evaluated. This paper
gives the details of the ground improvement plan, and presents the findings from measured field values