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Mattressing

Soil #Mattressing is deformation caused by high water pressures. When mattressing occurs it is a sign that effective refusal has been reached for that particular moisture content and that the pore pressures induced by the construction are preventing the particles from adopting a closer packing arrangement. Should higher densities and the ability to pass test rolling be required the most effective treatment would be to reduce the moisture content. The reason for mattressing is likely associated with the underlying soils being over-wet.

There are several approaches which may be considered in order to fill or compact on a site having soil matressing however each method has its pros and cons.

In the below example a working platform comprising of geofabric and a high permeability free-flowing drainage layer to relieve #groundwater pore pressure was implemented to provide structural support and to allow #construction to proceed.

case-study-video Mattressing
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