ABSTRACT
The underground space of densely populated cities contains parts of buildings, utility installations, deep foundations, tunnels, and deep excavations. It is possible, and increasingly more probable, that new underground constructions will be built within close proximity of existing pile foundations. This paper presents a framework for pile analysis to predict the consequences of new underground constructions on piles, specifically through the induced ground displacements. A numerical calculation for mechanized tunnels, where the pressures during tail void grouting are calculated iteratively with the ground displacements, is used to predict the settlements. The calculated ratio between the pile and the surface settlements was generally higher than 1 for a pile located above the tunnel, and smaller than 1 at a lateral distance larger than one tunnel diameter. The results agree with the literature on pile tunnel interaction and offer a rational framework to understand the different pile responses around a tunnel excavation.
