Tunnel–framed building interaction: comparison between raft and separate footing foundations

Xu, Jingmin; Franza, A.; Marshall, A. M.; Losacco, N.; Boldini, D.

Abstract

This paper investigates the influence of the foundation configuration (raft or separate footings) on tunnel-soil-framed building interaction using geotechnical centrifuge testing. Tunnelling-induced soil movements and deformation fields, framed building displacements, and structure shear distortions (with associated modification factors) are illustrated. Framed building stiffness and footing bearing capacity are also evaluated experimentally. Results show that the foundation configuration plays an important role in determining the ground response to tunnelling, affecting soil displacement fields as well as the distribution of soil shear and volumetric strains. In particular, foundation settlements and differential horizontal displacements are larger for separate footings compared to raft foundations. The effects of building width, weight, and eccentricity (with respect to the tunnel) on foundation settlements and structural distortions is quantified for separate footings and contrasted against results for raft foundations. The modification factor of the maximum building shear distortion is linked to the relative soil-building shear stiffness; interestingly, for buildings with similar values of relative stiffness, the level of shear distortion within framed buildings is lower for separate footings than rafts.

Citation

Xu, J., Franza, A., Marshall, A. M., Losacco, N., & Boldini, D. (2021). Tunnel–framed building interaction: comparison between raft and separate footing foundations. Géotechnique, 71(7), 631-644. https://doi.org/10.1680/jgeot.19.P.393

• Journal Article Type: Article
• Acceptance Date: Jun 3, 2020
• Online Publication Date: Dec 14, 2020
• Publication Date: 2021-07
• Deposit Date: Jun 4, 2020
• Publicly Available Date: Dec 15, 2021
• Journal: Géotechnique
• Print ISSN: 0016-8505
• Electronic ISSN: 1751-7656
• Publisher: Thomas Telford
• Peer Reviewed: Peer Reviewed
• Volume: 71
• Issue: 7
• Pages: 631-644
• DOI: https://doi.org/10.1680/jgeot.19.P.393
• Keywords: centrifuge modelling; deformation; footings/foundations; settlement; soil/structure interaction; tunnels & tunnelling
• Public URL: https://nottingham-repository.worktribe.com/output/4575160
• Publisher URL: https://www.icevirtuallibrary.com/toc/jgeot/current