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Centrifuge modelling of tunnelling beneath axially loaded displacement and non-displacement piles in sand

Accepted version
Peer-reviewed

Type

Conference Object

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Authors

Marshall, AM 

Abstract

Tunnelling under piled structures is becoming more common in urban areas. However, there is limited guidance available for the prediction of settlements and the loss of bearing capacity of existing piles due to tunnel excavation. This paper aims to provide an improved understanding of the response to tunnelling of axially loaded displacement and non-displacement piles. Data are provided from a series of geotechnical centrifuge tests of tunnel excavation beneath single piles in dry silica sand. The tests evaluate induced settlements of the piles at varying levels of initial safety factor (i.e. the ratio between initial bearing capacity and applied load). Furthermore, a previously published analytical approach, based on cavity expansion theory, is used to investigate the variation of the residual safety factor at constant pile load with tunnel volume loss. The outcomes of both centrifuge and analytical investigations illustrate the importance of pile installation method and initial safety factor and improve understanding of tunnel-pile interaction mechanisms.

Description

Keywords

4005 Civil Engineering, 4015 Maritime Engineering, 40 Engineering, 4019 Resources Engineering and Extractive Metallurgy

Journal Title

Geotechnical Special Publication

Conference Name

Geotechnical Frontiers 2017. GSP 277: Transportation facilities, structures, and site investigation

Journal ISSN

0895-0563

Volume Title

Publisher

ASCE
Sponsorship
Engineering and Physical Sciences Research Council (EPSRC) [EP/K023020/1]