UK

A32 Cherrymount, Enniskillen

overcoming soft ground conditions was key for this project

ByrneLooby were the civil and geotechnical designer for the contractor designed elements (CDE) for this £13m scheme of Class A trunk road in Enniskillen, Northern Ireland.

The 2km route runs through areas of deep very soft ground comprising peat and very soft lacustrine clays and key challenges included finding cost effective solutions to improve the competency of these soft ground locations to facilitate construction of the trunk road.

For the areas of soft ground, ‘excavate and replace’ techniques were used to improve the ground. We supervised construction of the soft ground replacement with engineered fill in a controlled, phased approach, in order to mitigate against potential instability of adjacent lands.

We were involved from the tender to construction stages, and also developed a value engineered soil nail solution as an alternative to the conceptual reinforced concrete retaining structure, saving our client both time and costs in the process.

Our role also involved the detailed design of a public and a private footbridge, and their associated approach ramps and bank seat abutments supported on reinforced earth embankments.

Scope of Project

  • Geotechnical designer for the CDE’s of the A32 Cherrymount Link Road in Northern Ireland.  
  • The CDE’s consisted of ground improvement design for areas of soft ground and design of public and private footbridges supported on reinforced earth embankments.
  • Involvement from tender to detailed design and construction supervision.
  • An alternative design solution for the soft ground areas was developed from the winning tender and was implemented through controlled, phased construction to mitigate risk of instability of adjacent lands.
  • Design of a value engineered soil nail scheme which offered time and material saving over the original retaining wall design.

 

Project Photos