A77 Carlock Wall Landslip Prevention Scheme
3 February 2020
Carlock Wall Landslip Prevention Scheme
Amey, on behalf of Transport Scotland, is undertaking a programme of ground improvement works to address the potential for landslip at Carlock Wall, south of Ballantrae.
UPDATE: 11th June 2021
Due to unexpected geotechnical ground conditions detected during construction of the A77 Carlock Wall scheme, additional ground stabilisation design and construction works are being undertaken, which will allow the original retaining wall to be reinstated.
The revised design scheme is about to be finalised and the contractor is currently carrying out advanced construction works to the lower slope areas to allow these additional repairs to go ahead safely in anticipation of this new design being agreed.
The anticipated completion of this scheme is now scheduled for late September/early October 2021. This is of course dependent on no new ground issues being identified, and all work remains weather dependent.
Please Note: This filmed sequence has been sped up
BACKGROUND TO THE SCHEME
Work was commenced on this scheme by the previous south-west trunk road Operating Company on Monday 3rd February 2020 with the installation of the site compound. This scheme came under the operational control of Amey at the outset of the new Network Management Contract South-West (NMC SW) in September 2020.
The project entails the removal of half of the carriageway and excavating the steep embankment and existing wall beneath it. One lane has been kept open by pinning the exposed face to allow a reinforced soil embankment to be constructed beneath the trunk road. Finally, the carriageway will be rebuilt and a new safety barrier and environmental noise barrier will be constructed.
The A77 Carlock Wall embankment continues to be monitored for signs of any landslip. Detailed ground investigations have been completed and an extensive programme prepared to deliver a project that will minimise the impact on the travelling public, while implementing a long-term solution to the area’s stability issues.”
To ensure the safety of road operatives and the travelling public it has been necessary to reduce the trunk road to a single lane, with temporary traffic lights in place.
Drivers, and particularly those heading for ferry services, are advised to allow some additional time for their journeys while these works are progressing. Special arrangements will be made for emergency service vehicles, however no extra specifications have been made for windfarm traffic or other oversized vehicles.
Our operatives are following strict physical distancing and hygiene protocols throughout the programme, in line with the Scottish Government’s COVID-19 guidance.