Product category:
Ground Engineering
News Release from: Tensar International | Subject: Tensar Basetex
Edited by the Buildingtalk Editorial
Team on 15 July 2003
Toome Embankment Reinforced With Tensar
Basetex
A design option from Tensar International, using Basetex basal reinforcements, was adopted to provide a competitively priced solution in this design and build target cost contract in Northern Ireland.
A 3.5 kilometre dual carriageway bypass is being constructed to remove traffic from the heavily congested village of Toome in Northern Ireland The bypass, which includes a 100 metres span 'bowstring girder', bridge over the lower River Bann is being constructed across soft alluvial clays in the Lower River Bann floodplain
This article was originally published on Buildingtalk on 29 Jul 2003 at 8.00am (UK)
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Ground conditions in the river floodplain are poor with more than 20 metres depth of peat and soft alluvium deposits either side of the river.
The Tensar design proffered to Bullen Consultants in the initial design phase used different grades of Basetex high strength geotextiles, with high tensile modulus and low creep, to combat the low shear strengths of the underlying soil.
Basetex has been used on each approach to the bridge as part of a piled platform to transfer the embankment loads into the weak sub-soil, minimising long-term consolidation settlement on the approaches to the bridge.
Elsewhere, the basal reinforcement of the embankment has been used to intercept failure surfaces, which may extend into the low strength foundation soil.
The Basetex was layered with granular fill sourced from the design and build contractor FP McCann's quarry, creating embankments up to 6 metres above the floodplain level.
This minimised settlement and improved foundation performance adjacent to the bridge abutments.
Landscaping which includes comprehensive 'local provenance' planting will integrate the embankments into the local environment.
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