Centrifuge Study on the Influence of Tunnel Excavation on Piles in Sand

Song, Geyang; Marshall, Alec M.

Abstract

© 2020 American Society of Civil Engineers. Tunneling-induced ground movements can affect the equilibrium state of an existing pile, causing uneven settlement among pile groups and damage to connected structures. This paper presents results from five centrifuge tests aimed at evaluating the load redistribution mechanisms that occur within piles located close to tunnel excavation. Two main mechanisms are studied: first, those related to ground displacements and stress relief related to tunneling and, second, those related to pile head load changes caused by connected superstructures (accomplished using a hybrid centrifuge-numerical modeling method). A novel fiber Bragg grating sensor system was used to measure shaft shear stresses along model piles. Results are used to quantify the relative impact that these two mechanisms have on pile load redistribution during tunnel volume loss. In addition, posttunneling pile loading tests were performed, with results indicating that tunneling-induced ground volumetric strains could influence the posttunneling loading response of piles.

Citation

Song, G., & Marshall, A. M. (2020). Centrifuge Study on the Influence of Tunnel Excavation on Piles in Sand. Journal of Geotechnical and Geoenvironmental Engineering, 146(12), Article 04020129. https://doi.org/10.1061/%28ASCE%29GT.1943-5606.0002401

• Journal Article Type: Article
• Acceptance Date: Jul 8, 2020
• Online Publication Date: Sep 20, 2020
• Publication Date: Dec 1, 2020
• Deposit Date: Jul 10, 2020
• Publicly Available Date: Sep 20, 2020
• Journal: Journal of Geotechnical and Geoenvironmental Engineering
• Print ISSN: 1090-0241
• Electronic ISSN: 1943-5606
• Publisher: American Society of Civil Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 146
• Issue: 12
• Article Number: 04020129
• DOI: https://doi.org/10.1061/%28ASCE%29GT.1943-5606.0002401
• Keywords: tunnel, pile, structure, centrifuge
• Public URL: https://nottingham-repository.worktribe.com/output/4758561
• Publisher URL: https://ascelibrary.org/doi/10.1061/%28ASCE%29GT.1943-5606.0002401