Open-face tunnelling effects on non-displacement piles in clay – part 2: tunnelling beneath loaded piles and analytical modelling

Williamson, Michael G.; Mair, RJ; Devriendt, M; Elshafie, Mohammed

doi:10.1680/jgeot.sip17.p.120

Cited by 14 publications

(15 citation statements)

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“…Pile C, used for the pile load tests, is highlighted in the diagrams. The pile variable relates to the tunnelling aspects described in the companion paper (Williamson et al, 2017) and is relative to test PC2 (the reference test). The locations of piles A and B were chosen to reflect the various zones of influence from previous studies (Jacobsz et al, 2004;.…”

Section: Open-face Tunnelling Effects On Non-displacement Piles In CLmentioning

confidence: 99%

“…Figures 9(a)-9(d) show the raw pile load data for tests PC2, PC4, PC5 and PC6 respectively, with and without applying temperature compensation to take account of changes from ambient temperature; the force sign convention used here and in the companion paper (Williamson et al, 2017) is negative for tension and positive for compression. For test PC2 (Fig.…”

Section: Open-face Tunnelling Effects On Non-displacement Piles In CLmentioning

confidence: 99%

“…The experimental results from piles A and B, which were designed to investigate the effects of tunnelling on piles, are described by Williamson et al (2017). The results from the pile load tests on pile C are described in this section.…”

Section: Illustration Of Pile Capability -Pile Load Testsmentioning

confidence: 99%

“…In a companion paper (Williamson et al, 2017), experimental results of the simulated tunnelling tests on piles are presented and compared with simple analytical solutions.…”

Section: Introductionmentioning

confidence: 99%

“…The non-linearity of the t-z curves was derived from a power-law stress-strain relationship based on triaxial tests conducted to characterise the clay soil behaviour (Vardanega et al, 2012a). Finally, the centrifuge model tests results are compared and contrasted with the analytical results and some interesting conclusions are presented.In a companion paper (Williamson et al, 2017), experimental results of the simulated tunnelling tests on piles are presented and compared with simple analytical solutions. …”

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Open-face tunnelling effects on non-displacement piles in clay – part 1: centrifuge modelling techniques

et al. 2017

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A research programme conducted at the University of Cambridge geotechnical centrifuge provided high-quality data on the interaction effects of open-faced tunnelling beneath non-displacement piles in clay. This paper presents details of the novel centrifuge package, including the reinforced composite piles used to measure loads during the centrifuge tests. Attention is particularly drawn to the importance of temperature compensation and the corresponding effect on the model piles. Results from maintained pile load tests conducted in the centrifuge are presented; through photogrammetric techniques, these are compared with data from pile load cells. The results, also compared with analytical t-z power-law modelling of the soil stress-strain behaviour based on triaxial tests, illustrate the importance of modelling the full history of both soil and piles prior to any subsequent tunnellinginduced loading. The experimental results of the simulated tunnelling tests on piles are presented and compared with simple analytical solutions in a companion paper.KEYWORDS: piles & piling; soil/structure interaction; tunnels & tunnelling INTRODUCTIONWith over half of humanity now living in urban areas, the demand on space and new transport infrastructure is unprecedented. The limited availability of surface space in major cities makes the demand for underground infrastructure, which often involves major tunnelling projects, increasingly more compelling. As a result, the construction of new underground railways, sewers and roadways is being undertaken in highly populated urban cities such as London, Amsterdam, Shanghai, Singapore and Hong Kong and many others using various tunnelling techniques.The stress changes from such tunnelling activities result in soil movements that propagate through the soil and are eventually observed as settlement and horizontal displacements at the ground surface. Significant research has gone into the prediction and observation of the effect of these ground movements on buildings supported by shallow foundations (e.g. Burland, 1997;Potts & Addenbrooke, 1997;Franzius et al., 2006;Farrell, 2010;Mair, 2011). However, there has been significantly less research on the effects of tunnelling-induced ground movements on piled foundations and the resulting interaction with the overlying structure(s) that these foundations support.Previous experimental modelling work investigating the effects of tunnelling on piles has mainly focused on the effects of tunnelling on driven piles (Loganathan et al., 2000;Jacobsz et al., 2004;Marshall & Mair, 2011). Driven piles are considered a 'worst-case' scenario, particularly in sands where the stress bulb at the pile toe is subjected to stress relief from tunnelling-induced ground movements that may result in pile failure, as shown by Marshall (2012). However, in order to reduce noise and vibration effects, the majority of piles constructed in major cities in recent years have been non-displacement (bored) piles, rather than driven piles. Field data from well-documented case ...

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Section: Open-face Tunnelling Effects On Non-displacement Piles In CLmentioning

confidence: 99%

Section: Open-face Tunnelling Effects On Non-displacement Piles In CLmentioning

confidence: 99%

Section: Illustration Of Pile Capability -Pile Load Testsmentioning

confidence: 99%

“…In a companion paper (Williamson et al, 2017), experimental results of the simulated tunnelling tests on piles are presented and compared with simple analytical solutions.…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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