Evaluation of innovative sprayed-concrete-lined tunnelling

Jones, Benoît; Thomas, A. H.; Hsu, Yu Sheng; Hilar, M.

doi:10.1680/geng.2008.161.3.137

Cited by 13 publications

(10 citation statements)

References 6 publications

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“…Crossrail east-bound (TBM2), X-line northern half O'Reilly and New (1982) case histories data Mair and Taylor (1997) (Jones et al, 2008) West Ham (Macklin and Field, 1998) JLE west-bound, St. James's Park (Nyren, 1998) JLE east-bound, St. James's Park (Nyren, 1998) CTRL Up-Line, Dagenham (Standing and Selemetas, 2013) CTRL Down-Line, Dagenham (Standing and Selemetas, 2013) Crossrail west-bound (TBM1), X-line X3 X4 X5 X6 X7 X8 X9 X10A X11 X12 X13 X14 X15 X16 X17 X18 X19 X20 X21 X22 Y5 Y6 Y7 Y8 Y9 Y10 Y11 Y12A Y13A Y14 Y15 Y16 Y17 Y18 Y19 Y21 Y22 Y23 Y24 - -Y3 Y5-Y6 Y6-Y7 Y7-Y8 Y8-Y9 Y9-Y10 Y10-Y11 Y11-Y12 Y12A-Y13A Y13A-Y14A Y14-Y15 Y15-Y16 Y16-Y17 Y17-Y18 Y18-Y19 Y19-Y20 Y21-Y22 Y22-Y23 Y23-Y24 - Theoretical volume of shield tapering and tail void closure…”

Section: Crossrail East-bound (Tbm2) X-line Southern Halfmentioning

confidence: 99%

Measured short-term ground surface response to EPBM tunnelling in London Clay

et al. 2017

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Earth-pressure-balance machines (EPBMs) were used for the construction of Crossrail tunnels in London, providing opportunities for field investigation of consequent ground response. Analysed results from an instrumented research site in Hyde Park with extensive surface and subsurface monitoring arrays are presented and discussed. The Crossrail tunnels at the site are 34·5 m below ground, deeper than those in most case histories of tunnelling in stiff clay in the UK. This paper characterises the tunnelling-induced ground response, both 'greenfield' and in the proximity of the existing Central Line tunnels, dealing with measurements at the ground surface. A companion paper covers the subsurface ground response. Vertical and horizontal ground surface displacements were obtained from manual precise levelling and micrometer stick measurements. Several key findings will benefit future tunnelling projects involving EPBMs. Volume loss values measured at the instrumented site were low, being less than 0·8% and 1·4% for the first and second tunnel drives respectively, higher values being associated with ground softening from the first tunnel construction. Smaller volume losses were recorded in the vicinity of the existing Central Line tunnels, compared with the greenfield location, suggesting that their presence inhibited the development of ground movements. Asymmetric settlement troughs developed due to either the nearby pre-existing tunnels or the construction of the first tunnel. Marginally smaller values of trough width parameter, Ky, were determined for these deeper tunnels compared with previous greenfield ground case histories. Resultant vectors of ground surface displacement were directed to well-defined pointsinks above the tunnel axis level. BackgroundIn major cities like London, constructing new tunnels inevitably influences nearby existing structures above and within the ground. Much has been learnt about the complex interactions between the ground and existing underground structures from new tunnel construction reported through case studies. With advances in tunnelling technologies and practices and construction materials, engineers and researchers continuously endeavour to update and improve their understanding of ground and structural response to tunnel construction. Recently a comprehensive research project 2 has been run by Imperial College London to investigate the effect of tunnelling by modern earth pressure balance tunnel boring machines (EPBMs) on existing tunnels (Standing et al., 2015). Field measurements at an instrumented site in Hyde Park formed an integral part of the overall research project.Short-term tunnelling-induced ground surface displacements are still frequently predicted using empirical approaches (Attewell, 1978). Vertical displacements are estimated using a Gaussian formulation where there are two unknowns: volume loss (VL) and the trough width parameter (K). Of these, volume loss is the more difficult to predict, it depends on various factors such as method of tunnelling, g...

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Section: Crossrail East-bound (Tbm2) X-line Southern Halfmentioning

confidence: 99%

Measured short-term ground surface response to EPBM tunnelling in London Clay

et al. 2017

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“…Also shown in Figure 22 are values of K calculated from surface settlements listed in Table Ϫ5·0 Mair and Taylor (1997), as well as subsurface and surface settlements from more recent projects. The new surface settlement data come from Heathrow Terminal 4 station (Clayton et al, 2006) and Heathrow Terminal 5 storm water outfall tunnel frontshunt tunnel (Jones et al, 2008). Those undertaking settlement predictions should take note of the variability of K as demonstrated by Figure 22, and the accuracy of its prediction, and perform appropriate sensitivity analyses.…”

Section: Discussionmentioning

confidence: 99%

Low-volume-loss tunnelling for London ring main extension

Jones¹

2010

Proceedings of the Institution of Civil Engineers - Geotechnica

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The Thames Water ring main extension is a 4·5 km long tunnel from Stoke Newington, in the London borough of Hackney, to New River Head in Finsbury, in the London borough of Islington. The 2·85 m i.d. tunnel was excavated by an earth pressure balance tunnel-boring machine (TBM) at depths between 40 and 60 m below the surface. Surface settlements along the route were measured by precise levelling, and were found to be small. It was therefore even more important to measure these settlements as accurately as possible, in order to provide informed estimates of subsurface movements induced in third-party underground structures much closer to the tunnel horizon. Because of the relatively large magnitude of the background movements measured, when compared with the small tunnel-induced settlements, it was necessary to adopt a rigorous statistical method to fit a Gaussian curve to the data. This exploited the analogy of the ‘error function' to define the Gaussian curve parameters i and Vl. In all, 13 tunnels were underpassed successfully by the TBM, all within the ‘conservative expected value' predictions, and without incident. The predictions and structural monitoring schemes undertaken for the High Speed 1 tunnels near Corsica Street and the Northern line tunnels near Angel station are described in the paper. It was found that the surface and subsurface trough width parameter K did not vary with depth as predicted: therefore a new relationship is proposed.

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“…Finally, to simulate the dependency of the modulus with the depth or stress level, the equation is modified as follows [21]: .…”

Section: Non-linear Elasticitymentioning

confidence: 99%

Numerical Modelling of the Soil Behaviour by Using Newly Developed Advanced Material Model

Vesely

2017

Acta Polytech

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Abstract. This paper describes a theoretical background, implementation and validation of the newly developed Jardine plastic hardening-softening model (JPHS model), which can be used for numerical modelling of the soils behaviour. Although the JPHS model is based on the elasto-plastic theory, like the Mohr-Coulomb model that is widely used in geotechnics, it contains some improvements, which removes the main disadvantages of the MC model. The presented model is coupled with an isotopically hardening and softening law, non-linear elastic stress-strain law, non-associated elasto-plastic material description and a cap yield surface. The validation of the model is done by comparing the numerical results with real measured data from the laboratory tests and by testing of the model on the real project of the tunnel excavation. The 3D numerical analysis is performed and the comparison between the JPHS, Mohr-Coulomb, Modified Cam-Clay, Hardening small strain model and monitoring in-situ data is done.

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Evaluation of innovative sprayed-concrete-lined tunnelling

Cited by 13 publications

References 6 publications

Measured short-term ground surface response to EPBM tunnelling in London Clay

Measured short-term ground surface response to EPBM tunnelling in London Clay

Low-volume-loss tunnelling for London ring main extension

Numerical Modelling of the Soil Behaviour by Using Newly Developed Advanced Material Model

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