THE PROBLEM
The new alignment of the N6 at Kiltullagh went through a disused quarry that was 13m deep. Considerable retaining structures were required to support the new motorway through the flooded quarry.
THE SOLUTION
The Tensartech TR2 system, set at 70°, was chosen as it allowed cost effective, rapid and simple construction to form the back to back, partially submerged, retaining structure and has a design life of 120 years. The galvanised facing steel and the stone backing provide the aesthetically pleasing façade to the Tensar uniaxial geogrids and structural fill.
PROJECT DESCRIPTION
As part of the €500M N6 Galway to Ballinasloe PPP, a new section of the dual carriageway was aligned through a disused quarry in Kiltullagh. The Tensartech TR2 system was chosen for the retaining structures due to the easy nature and speed in which it is constructed, along with a stone style appearance to match the quarry landscape.
Tensar International carried out a series of feasibility Application Suggestions based on HA68/94 design methods for the reinforcement of highway slopes for Atkins, who in turn reviewed and adopted them on their scheme. The Tensar system materials were supplied to the contractor by TAL Distribution Ltd. The walls were constructed using well graded granular fill and were built when the quarry was in a drained condition.
The TensarTech TR2 system gives a durable, and cost effective, eco-friendly Soil reinforced Structure which is aesthetically pleasing and blends well with the local landscape.
