Predicting tunnelling-induced ground movements and interpreting field measurements using numerical analysis: Crossrail case study at Hyde Park

Avgerinos, V.; Potts, David M.; Standing, J. R.; Wan, Michael; Ieronymaki, Evangelia S.; Boukin, Katerina; Whittle, Andrew J.

doi:10.1680/jgeot.18.d.008

Cited by 1 publication

(11 citation statements)

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“…The ground profile proposed by Avgerinos et al (2018) based on the borehole data obtained by Wan & Standing (2014) was adopted in this study. It consists of 6 m of superficial deposits (made ground, alluvium and terrace gravels) overlying London Clay divided into three units (King, 1981): B2, A3 and A2 with thicknesses of 30 m, 12.5 m and 11.4 m, respectively.…”

Section: Site and Ground Characteristicsmentioning

confidence: 99%

“…Stages 1 to 4 involve modelling of the previous stress history of the site, which is vital for accurate predictions of tunnelling effects (Avgerinos et al, 2016), as well as the installation of the Crossrail tunnels. As these stages are the exact repetition of isothermal analyses carried out by Avgerinos et al (2018), their results are not discussed in this paper. Stage 5 is a long-term isothermal coupled consolidation analysis during which all previously generated excess pore water pressures are allowed to dissipate in order to separate the thermal from the excavation effects (Gawecka et al, 2017).…”

Section: Analysis Stagesmentioning

confidence: 99%

“…The first part of this study involved reproduction of the isothermal analyses performed by Avgerinos et al (2018), with the same material properties being adopted as summarised in Tables 3-7 in the Appendix. The superficial deposits comprising of made ground, alluvium and terrace gravels were modelled as linear elastic-perfectly plastic with a Mohr Coulomb failure surface, whereas the Lambeth Group layers were modelled as non-linear elastic-perfectly plastic with a Mohr Coulomb failure surface.…”

Section: Materials Models and Propertiesmentioning

confidence: 99%

“…Although the Crossrail tunnels are not thermoactive, they represent a typical modern tunnel with a bolted precast concrete segmental lining, constructed using an earth-pressure-balance tunnel-boring machine in ground conditions characteristic of the London Basin. Additionally, their construction was extensively monitored (Wan et al, 2017) and their response was successfully reproduced through FE analysis employing coupled consolidation and advanced constitutive models (Avgerinos et al, 2018). In this study, the analyses performed by Avgerinos et al (2018) were reproduced using the same modelling methods and, subsequently, coupled THM analyses simulating the long-term thermal operation of the tunnels were carried out.…”

mentioning

confidence: 99%

“…Additionally, their construction was extensively monitored (Wan et al, 2017) and their response was successfully reproduced through FE analysis employing coupled consolidation and advanced constitutive models (Avgerinos et al, 2018). In this study, the analyses performed by Avgerinos et al (2018) were reproduced using the same modelling methods and, subsequently, coupled THM analyses simulating the long-term thermal operation of the tunnels were carried out. The results of the latter stage are presented and discussed in this paper.…”

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confidence: 99%

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Predictive modelling of thermo-active tunnels in London Clay

Gawecka

Potts

et al. 2021

Géotechnique

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Thermo-active structures are underground facilities which enable the exchange of thermal energy between the ground and the overlying buildings, thus providing renewable means of space heating and cooling. Although this technology is becoming increasingly popular, the behaviour of geotechnical structures under additional thermal loading is still not fully understood. This paper focuses on the use of underground tunnels as thermo-active structures and explains their behaviour through a series of finite element analyses based on an existing case study of isothermal tunnels in London Clay. The bespoke finite element code ICFEP is adopted which is capable of simulating the fully coupled thermohydro-mechanical behaviour of porous materials. The complex coupled interactions between the tunnel and the surrounding soil are explored by comparing results from selected types of coupled and uncoupled simulations. It is demonstrated that: (1) the thermally-induced deformation of the tunnel and the ground are more critical design aspects than the thermally-induced forces in the tunnel lining, and(2) the modelling approach in terms of the type of analysis, as well as the assumed permeability of the tunnel lining, have a significant effect on the computed tunnel response and, hence, must be chosen carefully.

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Section: Site and Ground Characteristicsmentioning

confidence: 99%