During the construction process, areas of natural or man made ground often require treatment to improve stiffness and load bearing capacity of the soil. This treatment is principally required to achieve acceptable levels of settlement for future construction work. Traditionally, monitoring of the improvement works is carried out using invasive penetration tests or expensive plate loading tests. Seismic methods may also be used to assess the degree by which the ground has been improved in terms of stiffness. One method that shows the greatest potential in supplementing the more traditional methods of quality control is the Continuous Surface Wave (CSW) method. This surface seismic technique is capable of providing stiffness profiles rapidly on site and hence can be used alongside ground improvement methods. This paper discusses the use of CSW in th is particular context. CSW tests have been performed on a representative area of a commercial site immediately prior to ground improvement. The ground improvement was performed by the installation of vibroreplacement stone columns. An identical suite of tests were also performed and compared immediately after the completion o fthe ground treatment, on the same day as the initial test. The effect of the vibro-replacement columns in improving the site is considered using the stiffness profiles obtained.


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