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primary topic: Innovations in Micropile Testing Using Distributed Optical Fibre Sensors

Innovations in Micropile Testing Using Distributed Optical Fibre Sensors
type: AcademicArticle
type: Article
abstract: Micropiles are primarily used in situations where traditional foundation methods, such as large-diameter bored piles or driven piles, are not feasible due to various constraints, including limited access, low headroom, or the need to work in environmentally sensitive areas. They are often employed in urban areas with restricted space or for underpinning existing structures. Two case studies of instrumented micropiles are presented in this paper, with the aim to showcase innovations in pile testing using Distributed Optical Fibre Sensing (DOFS). In the first project, micropiles were installed as part of an underpinning work where several existing piles were removed to allow safe passage of Tunnel Boring Machine (TBM) underneath the building. An experiment pile was instrumented with conventional and DOFS sensors to measure pile responses due to tunnelling in proximity. In the second project, the micropile was tested to determine its load carrying capacity for buildings constructed in hilly area. In both cases, API pipes were applied and socketed into bedrocks. Optical cables were attached on four sides of the steel pipes and subsequently grouted. During the load tests, DOFS data were able to display precisely the shaft distribution of micropiles when subjected to vertical loads as well as bending behaviour due to the close proximity tunnelling. Interpretations of distributed strain profiles from DOFS have contributed to a better understanding of API-reinforced micropile performance under complex geological and loading conditions. © Published under licence by IOP Publishing Ltd.
date: 2023
volume: 1249
issue: 1
is part of: IOP Conference Series: Earth and Environmental Science
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ConferenceItemEPrint
is part of: repository

Institute of Physics
type: Organization

IOP Conference Series: Earth and Environmental Science
type: Collection
issn: 17551307

C.M. Khoo
type: Person
given name: C.M.
family name: Khoo

B.P. Tee
type: Person
given name: B.P.
family name: Tee

H. Mohamad
type: Person
given name: H.
family name: Mohamad

A.A.A.M. Beddelee
type: Person
given name: A.A.A.M.
family name: Beddelee

M.Y.M. Nasir
type: Person
given name: M.Y.M.
family name: Nasir

M.F. Ghazali
type: Person
given name: M.F.
family name: Ghazali

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primary topic: Innovations in Micropile Testing Using Distributed Optical Fibre Sensors