ABSTRACT
Predicting the influence of tunnelling induced displacements on nearby structures is essential for urban tunnelling projects. However, piled foundations have a reinforcing effect on the soil, influencing the settlement of the associated structure as well as surrounding structures. This means that traditional greenfield settlement prediction methods are not accurate and instead numerical analysis is required to predict ground movements. A simplified, two-stage analysis can be completed by first predicting the greenfield ground movements down the length of the pile and applying these displacements to the end of Winkler springs representing the interface between the pile and the soil. A simple solution is presented for compressible piles in homogeneous soil and layered soil. Extension of the solution to inhomogeneous soil layers and to pile groups is discussed.
