The Second Severn River Crossing in the UK required embankment construction over highly compressible estuarine clay and peat soils to form a Toll Plaza. The paper describes the background, design and construction of the adoption of an innovative concept for the required embankment support. A geogrid-reinforced mattress was employed to transfer the embankment loads via arching to a grid of Vibro Concrete Columns which further transfer the loads through the weak alluvial soils to the underlying sands and gravels.
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