Case Study: Dublin Docklands Authority achieves safe retaining wall restraint with Oasys Software

Novel Methods of Restraining Embedded Retaining Walls

Oasys Software supported Dublin Docklands Authority on the upgrade of a Ro-Ro ramp at Dublin Port in Ireland, where a new floating ramp and linked retaining wall works had to fit severe site constraints. Traditional restraint methods such as tie-backs and temporary propping were not practical because of underground services, limited access, and the need to keep space clear in front of the wall, so the team needed an alternative way to stabilise a contiguous pile retaining wall.

Using Oasys STAWAL/Frew for stability and serviceability analysis and Oasys AdSec for structural design, Oasys Software helped develop a permanent counterweight solution built behind the wall and dowelled at multiple levels. The design predicted a maximum temporary wall deflection of 22 mm, and monitoring showed the wall largely moved during counterweight construction, with measured deflections typically only 27% to 38% of predicted values. The approach was successfully constructed, providing the required permanent restraint and structural support.

Dublin Docklands Authority