Advanced numerical analyses of EPB tunnelling using critical state plasticity

Dimitris Litsas, Panagiotis Sitarenios, Michael Kavvadas

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

Abstract

The paper discusses the effect of using several ground constitutive models on the numerical predictions of tunnelling induced ground movements. The numerical study utilizes an advanced 3D finite element model for EPB tunnelling, proposed by the authors, which allows realistic modelling of geometrical and operational complexities of EPB machines. Two constitutive models are used to describe ground behaviour, an elastic – plastic with Mohr – Coulomb failure surface and the Modified Cam-Clay (MCC) critical state plasticity model. For a fair comparison, the two models are calibrated to have similar compressibility and shear strength at stress levels corresponding to the tunnel axis. The results indicate that the MCC model leads to significantly higher crown displacements compared to the Mohr – Coulomb analyses, while ground surface settlement predictions are comparable. The observed behaviour is explained by the stress-dependent compressibility and more realistic non-linear stress-strain response of the MCC.
Original languageEnglish
Title of host publicationProceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE
Place of PublicationDubai, UAE
Publication statusPublished - Apr 2018
Event ITA-AITES World Tunnel Congress 2018 - Dubai, United Arab Emirates
Duration: 21 Apr 201826 Apr 2018
http://www.wtc2018.ae/download/WTC2018-Brochure_V3-181217.pdf

Conference

Conference ITA-AITES World Tunnel Congress 2018
Abbreviated titleWTC 2018
CountryUnited Arab Emirates
CityDubai
Period21/04/1826/04/18
Internet address

Fingerprint

Plasticity
Cams
Clay
Constitutive models
Compressibility
Shear strength
Tunnels
Plastics

Cite this

Litsas, D., Sitarenios, P., & Kavvadas, M. (2018). Advanced numerical analyses of EPB tunnelling using critical state plasticity. In Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE Dubai, UAE.

Advanced numerical analyses of EPB tunnelling using critical state plasticity. / Litsas, Dimitris; Sitarenios, Panagiotis; Kavvadas, Michael.

Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE. Dubai, UAE, 2018.

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

Litsas, D, Sitarenios, P & Kavvadas, M 2018, Advanced numerical analyses of EPB tunnelling using critical state plasticity. in Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE. Dubai, UAE, ITA-AITES World Tunnel Congress 2018 , Dubai, United Arab Emirates, 21/04/18.
Litsas D, Sitarenios P, Kavvadas M. Advanced numerical analyses of EPB tunnelling using critical state plasticity. In Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE. Dubai, UAE. 2018
Litsas, Dimitris ; Sitarenios, Panagiotis ; Kavvadas, Michael. / Advanced numerical analyses of EPB tunnelling using critical state plasticity. Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE. Dubai, UAE, 2018.
@inproceedings{f569afbc9d954429b5c95b2fedb96db6,
title = "Advanced numerical analyses of EPB tunnelling using critical state plasticity",
abstract = "The paper discusses the effect of using several ground constitutive models on the numerical predictions of tunnelling induced ground movements. The numerical study utilizes an advanced 3D finite element model for EPB tunnelling, proposed by the authors, which allows realistic modelling of geometrical and operational complexities of EPB machines. Two constitutive models are used to describe ground behaviour, an elastic – plastic with Mohr – Coulomb failure surface and the Modified Cam-Clay (MCC) critical state plasticity model. For a fair comparison, the two models are calibrated to have similar compressibility and shear strength at stress levels corresponding to the tunnel axis. The results indicate that the MCC model leads to significantly higher crown displacements compared to the Mohr – Coulomb analyses, while ground surface settlement predictions are comparable. The observed behaviour is explained by the stress-dependent compressibility and more realistic non-linear stress-strain response of the MCC.",
author = "Dimitris Litsas and Panagiotis Sitarenios and Michael Kavvadas",
year = "2018",
month = "4",
language = "English",
booktitle = "Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE",

}

TY - GEN

T1 - Advanced numerical analyses of EPB tunnelling using critical state plasticity

AU - Litsas, Dimitris

AU - Sitarenios, Panagiotis

AU - Kavvadas, Michael

PY - 2018/4

Y1 - 2018/4

N2 - The paper discusses the effect of using several ground constitutive models on the numerical predictions of tunnelling induced ground movements. The numerical study utilizes an advanced 3D finite element model for EPB tunnelling, proposed by the authors, which allows realistic modelling of geometrical and operational complexities of EPB machines. Two constitutive models are used to describe ground behaviour, an elastic – plastic with Mohr – Coulomb failure surface and the Modified Cam-Clay (MCC) critical state plasticity model. For a fair comparison, the two models are calibrated to have similar compressibility and shear strength at stress levels corresponding to the tunnel axis. The results indicate that the MCC model leads to significantly higher crown displacements compared to the Mohr – Coulomb analyses, while ground surface settlement predictions are comparable. The observed behaviour is explained by the stress-dependent compressibility and more realistic non-linear stress-strain response of the MCC.

AB - The paper discusses the effect of using several ground constitutive models on the numerical predictions of tunnelling induced ground movements. The numerical study utilizes an advanced 3D finite element model for EPB tunnelling, proposed by the authors, which allows realistic modelling of geometrical and operational complexities of EPB machines. Two constitutive models are used to describe ground behaviour, an elastic – plastic with Mohr – Coulomb failure surface and the Modified Cam-Clay (MCC) critical state plasticity model. For a fair comparison, the two models are calibrated to have similar compressibility and shear strength at stress levels corresponding to the tunnel axis. The results indicate that the MCC model leads to significantly higher crown displacements compared to the Mohr – Coulomb analyses, while ground surface settlement predictions are comparable. The observed behaviour is explained by the stress-dependent compressibility and more realistic non-linear stress-strain response of the MCC.

M3 - Conference proceeding

BT - Proceedings in USB, World Tunnel Congress 2018, April 2018, Dubai, UAE

CY - Dubai, UAE

ER -