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.  

Highlights

  • 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.