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http://dx.doi.org/10.9711/KTAJ.2015.17.2.091

A study on the effect of the locations of pile tips on the behaviour of piles to adjacent tunnelling  

Lee, Cheol-Ju (Department of Civil Engineering, Kangwon National University)
Jeon, Young Jin (Department of Civil Engineering, Kangwon National University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.17, no.2, 2015 , pp. 91-105 More about this Journal
Abstract
In the current work, a series of three-dimensional (3D) finite element analyses have been performed to study the effects of the locations of pile tips on the behaviour of single piles to adjacent tunnelling. In the numerical modelling, several key issues, such as tunnelling-induced pile head settlements, axial pile forces, interface shear stresses and apparent factors of safety have been studied. When the pile tips are inside the influence zone which considers the relative pile tip location with respect to the tunnel position, tunnelling-induced pile head settlements are larger than those computed from the greenfield condition. However, when the pile tips were outside the influence zone, an opposite trend was observed. When the pile tips were inside the influence zone, tunnelling-induced tensile pile forces developed; however, when the pile tips were outside the influence zone, tunnelling-induced compressive pile forces were mobilised, associated with larger settlements of the surrounding soil than the pile settlements. It has been shown that the increases in the tunnelling-induced pile head settlements have resulted in reductions of the apparent factor of safety by about 50% when the pile tips are inside the influence zone, therefore severly affecting the serviceability of piles. The pile behaviour, when considering the location of pile tips with regards to the influence zone, has been analysed in great detail by taking the tunnelling-induced pile head settlements, axial pile force and apparent factor of safety into account.
Keywords
Three-dimensional (3D) numerical modelling and analysis; Piles; Soil-structure interaction; Tunnelling;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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