Pile re-use

Pile re-use

New and re-used pile group settlement

The Bower, Old Street mixed use development in London involved the refurbishment and extension of buildings supported on a mix of existing under-reamed piles and new straight shafted piles. Differential settlement between buildings was critical but predicting that was difficult on this complex pile group.

A 3D FEA model of the entire pile group, validated by pile testing, was used to predict differential settlements across the site such that they could be accommodated in the structural design.  


  • Back analysis of under-reamed and straight shafted piles in similar ground conditions for validation.

  • 3D FEA model of entire pile group.

  • Simulation of existing condition, new pile installation, extension buildings and new loadings.