Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15499
Title: Effects of tunnel construction on nearby pile foundations
Authors: PANG CHIN HONG
Keywords: Tunnel-pile interaction, tunnel advancement, twin tunnels, field monitoring, 3-D finite element modelling, plane strain model
Issue Date: 14-Sep-2006
Source: PANG CHIN HONG (2006-09-14). Effects of tunnel construction on nearby pile foundations. ScholarBank@NUS Repository.
Abstract: The increased demand for underground systems in urban areas particularly for mass transportation has led to many tunnels being constructed close to pile foundation. A Mass Rapid Transit (MRT) lines constructed in Singapore i.e. North East Line C704 was studied. In C704, twelve bored piles were instrumented to monitor the piles responses developed during tunnel construction. Maximum axial force of up to 42% and 66% of the pile structural capacity was observed after single tunnel and twin tunnels advancement respectively. However, the induced bending moment was small compared to its ultimate capacity. Three-dimensional (3-D) finite element model was implemented to study the tunnel-pile interaction. In order to do a general study, a reliable finite element model was established by back-analysing the C704 data. Subsequently, the 3-D model was used for parametric studies to identify the critical and non-critical aspects in the design analysis. However in practice, the tunnel-pile interaction problem is usually idealised in plane strain model (2-D). The difficulty in carrying out a 2-D analysis is the selection of adequate parameters to represent 3-D effect. A substantial comparison study between 3-D model and 2-D model was carried out to identify the modification factor required. Simple calibration charts were prepared to estimate the modification factor.
URI: http://scholarbank.nus.edu.sg/handle/10635/15499
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