Product category:
Ground Engineering
News Release from: Tensar International | Subject: Geogrids
Edited by the Buildingtalk Editorial
Team on 19 February 2004
Geogrids Provide Thrust And Cost Relief
Cost saving solution provided by Tensar International involved layers of geogrid within the Wadhurst clay to create a reinforced thrust relief structure behind the concrete walls.
During the construction of waste water tanks at Bexhill and Hastings Waste Water Treatment Works, contractor Morgan Est wanted to use site won Wadhurst clay as backfill behind the concrete walls of the tanks, rather than more expensive imported granular fill The solution provided by Tensar International involved layers of geogrid within the Wadhurst clay to create a reinforced thrust relief structure behind the concrete walls
This article was originally published on Buildingtalk on 29 Jul 2003 at 8.00am (UK)
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Total savings have been estimated at over ?50 per mư of wall face giving a total saving of over £40K.
The reinforced concrete walls surrounding the settlement and aeration tanks are up to 4m high and are designed to retain granular backfill rather than the clay.
Morgan Est proposed the use of Wadhurst clay as it was already available from previous excavations and would otherwise be removed from site which would add costs through transport and landfill requirements.
However the concrete walls were not designed for the active pressures imposed by the clay so a pressure relieving solution was sought.
By layering Tensar geogrid with the Wadhurst clay a self-supporting vertical reinforced soil structure was developed with a geogrid wraparound face adjacent to the concrete walls.
In order to ensure that any swelling pressures within the clay would not load the retaining walls, a compressible polystyrene cellular panel was placed between the concrete walls of the tanks and the face of the reinforced soil structure.
The polystyrene panel also served as temporary formwork against which to construct the wraparound structure.
Tensar provided an indemnified design for the reinforced soil element of the project and by using the Wadhurst clay instead of imported granular fill, there were also environmental benefits through the reduction of off site transport and the saving of natural materials.
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