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Suitability of equivalent linear soil models for analysing the seismic response of a concrete tunnel

Suitability of equivalent linear soil models for analysing the seismic response of a concrete tunnel

Kampas, Georgios, Knappett, Jonathan A., Brown, Michael J., Anastasopoulos, Ioannis, Nikitas, Nikolaos, Alonso-Rodriguez, Andres and Fuentes, Raul (2018) Suitability of equivalent linear soil models for analysing the seismic response of a concrete tunnel. In: 16th European Conference in Earthquake Engineering, 18 - 21 June 2018, Thessaloniki, Greece.

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Abstract

Current methods of analysis for the seismic response of tunnels rely on linear elastic soil constitutive behaviour. This has obvious benefits in terms of minimising the number of soil parameters required and the complexity compared to more sophisticated soil models. However, it has recently become possible to parameterise sophisticated soil models using only routine data from boreholes or in-situ testing. This paper will therefore review the effectiveness of seismic analyses using an equivalent linear soil constitutive model, by comparison of 2D Finite Element simulations with those using an advanced non-linear elastic model with isotropic hardening plasticity. In the elastic case, the parameters have been estimated using Equivalent-linear Earthquake site Response Analyses software (EERA) and consideration will be given to the amount of sublayering that is required to match the variation of soil properties with depth. The tunnel considered is of horseshoe shape and sprayed concrete construction (New Austrian Tunnelling Method), based on metro tunnels in Santiago, Chile, subjected to the Llolleo ground motion from the 1985 Valparaiso Earthquake. The results will focus the differences in the induced structural forces within the tunnel lining and modification to the ground motion in the near-field of the tunnel, and discuss the implications of this for tunnel design.

Item Type: Conference or Conference Paper (Speech)
Uncontrolled Keywords: Finite Element Analysis; Hardening Soil Model; Horseshoe shape tunnel; Seismic Analysis; EERA
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Centre for Innovative & Smart Infrastructure
Faculty of Engineering & Science > Department of Engineering Science
Related URLs:
Last Modified: 14 Aug 2018 13:34
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/21063

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