Pile-tunnel interaction: A conceptual analysis

摘要

The underground space of densely populated cities contains parts of buildings, utility installations,rndeep foundations and tunnels. It is possible that new tunnels will be built within close proximity of existingrnpile foundations. Therefore pile tunnel interaction (PTI) must be assessed so that it is possible to ensure safetyrnfor both the tunnel construction and the pile-supported structures. This paper presents a simple model to evaluaternthe pile settlements and increment of axial force due to tunnel excavation. The displacement field aroundrnthe tunnel can be used to estimate the pile displacement and the differential displacements around the pile-soilrninterface. Based on an example plane strain calculation of an unlined tunnel, different possible pile locationsrnwere evaluated. The results were compared to six studies from the literature and considerable agreement wasrnobtained for the trends of ratios of pile to surface settlement and increment of axial stress on the pile.