Re-engineering of A5 Glyn Bends Cutting, Corwen, by Sergio Solera (Mott MacDonald)
In May 2006, the Glyn Bends section of the A5 trunk road was closed to traffic because there was concern regarding the stability of the rock cutting, supported by anchorages at 70° from horizontal. Many of the original anchorages were at risk of failure due to corrosion because of as installed details. Following road closure, it was necessary to re-engineer the cutting by re-grading the north face to a safe angle that did not require anchorage support, and re-anchoraging of the south face.
This presentation discusses the findings of the investigation of the failures of the original anchorages and the re-engineering of the cutting. The solution adopted was the one with the lowest level of risk, in terms of cost, programme and safety issues
The road was reopened to traffic in July 2007