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http://dx.doi.org/10.9711/KTAJ.2012.14.4.337

Behaviour of single piles and pile groups in service to adjacent tunnelling conducted in the lateral direction of the piles  

Lee, Cheol-Ju (강원대학교 토목공학과)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.14, no.4, 2012 , pp. 337-356 More about this Journal
Abstract
Three-dimensional (3D) numerical analyses have been performed to study the behaviour of single piles and grouped piles to adjacent tunnelling in the lateral direction of the pile. In the numerical analyses, the interaction between the tunnel, the pile and the soil next to the piles and shear transfer mechanism have been analysed allowing soil slip at the pile-soil interface by using interface elements. The study includes the shear stresses at the soil next to the pile, the axial force distributions on the pile and the pile settlement. It has been found that existing elastic solutions may not accurately estimate the pile behaviour since several key issues are excluded. Due to changes in the shear transfer between the pile and the soil next to the pile with tunnel advancement, the shear stresses and axial force distributions along the pile change drastically. Downward shear stress develops above the tunnel springline while upward shear stress is mobilised below the tunnel springline, resulting in a compressive force on the pile. In addition, mobilisation of shear strength at the pile-soil interface was found to be a key factor governing pile-soil-tunnelling interaction. It has been found that grouped piles are less influenced by the tunnelling than the single pile in terms of the axial pile forces. The reduction of apparent allowable pile capacity due to pile settlement resulted from the tunnelling seemed to be insignificant.
Keywords
Numerical modelling and analysis; Piles; Soil slip; Soil-structure interaction; Tunnel;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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