Evaluation of the induced axial force behaviour for bored tunnel construction adjacent to existing long piles

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Publication Title
Evaluation of the induced axial force behaviour for bored tunnel construction adjacent to existing long piles

Abstract
Population growth and increase in urbanisation contribute to an increased use of underground space. Consequently, new tunnel alignments are often situated near existing piled foundations. Thus, evaluating the induced forces and displacement in the piles caused by ground movements due to tunnelling must be considered. This study focused on assessing the maximum induced axial forces (Max.N) in long piles. A series of three-dimensional Finite Element Analyses were conducted. The model's validity was established by comparing it with data from a well-known literature. Parametric studies were performed, varying the tunnel depth (Z) and pile length (Lp) (lengths evaluated are 40 m, 50 m, and 59 m). The findings indicate that the behaviour of long piles in response to tunnelling exhibits two dominant characteristics. When tunnelling at a shallow depth (Z/Lp < 0.5), the Max.N in the piles remains relatively constant regardless of the pile length. However, for deep tunnel constructions (Z/Lp > 0.5), shorter piles are less affected compared to longer piles. These findings could benefit engineers when dealing with new pile construction plans or minimising potential impacts on existing piled foundations, as adjusted tunnel alignments could be considered.
Authors
P. Yensri; Asaad Faramarzi; N. Metje

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

C - Risk analysis and safety evaluation

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