Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model
In order to study the mechanical response of a hard rock tunnel excavated by double shield tunnel boring machine (DS-TBM), a numerical method was introduced to simulate the TBM excavating process. The failure modes of surrounding rock mass described based on the cohesion weakening and frictional str...
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doaj-6433494e21db42e0963a60a9ca790c4b2020-11-25T01:03:33ZengJVE InternationalJournal of Vibroengineering1392-87162538-84602019-06-0121481983210.21595/jve.2018.1988419884Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS modelDiyuan Li0Jing Sun1Quanqi Zhu2Xiangyun Xu3Jian Jiao4School of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, ChinaKunming Railway Construction Company of China Railway No. 8 Engineering Group Co., Ltd, Kunming, Yunnan, 650200, ChinaKunming Railway Construction Company of China Railway No. 8 Engineering Group Co., Ltd, Kunming, Yunnan, 650200, ChinaIn order to study the mechanical response of a hard rock tunnel excavated by double shield tunnel boring machine (DS-TBM), a numerical method was introduced to simulate the TBM excavating process. The failure modes of surrounding rock mass described based on the cohesion weakening and frictional strengthening (CWFS) Mohr-Coulomb strain-softening criterion. The characteristics of stress field and plastic zone on the cross and longitudinal section of the tunnel were analyzed in detail, and the results were compared with those in the intrinsic condition (when TBM model is not activated). The simulation results indicate that the stress paths at the vault are relatively simple, and the stress concentration caused by excavation unloading is obviously reduced by lining and backfill grouting, while the sidewall is less disturbed by the excavation of TBM. The invert experiences three unloading processes, due to excavation, the contact between the rear shield and the bottom of surrounding rock, as well as backfill grouting at gap between the lining and the rock mass. The vault has a larger plastic zone than the invert, attributing to the geometrical difference between the cutter-head and the front shield, as well as the conicity of the front and rear shields. The area of plastic zones gradually increases along the tunnel route, but it becomes stable after the rear shield.https://www.jvejournals.com/article/19884double shield tunnel boring machineCWFS modelnonuniform gapstress fieldplastic zone |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Diyuan Li Jing Sun Quanqi Zhu Xiangyun Xu Jian Jiao |
spellingShingle |
Diyuan Li Jing Sun Quanqi Zhu Xiangyun Xu Jian Jiao Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model Journal of Vibroengineering double shield tunnel boring machine CWFS model nonuniform gap stress field plastic zone |
author_facet |
Diyuan Li Jing Sun Quanqi Zhu Xiangyun Xu Jian Jiao |
author_sort |
Diyuan Li |
title |
Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model |
title_short |
Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model |
title_full |
Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model |
title_fullStr |
Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model |
title_full_unstemmed |
Numerical analysis of hard rock tunnel excavated by double shield TBM based on CWFS model |
title_sort |
numerical analysis of hard rock tunnel excavated by double shield tbm based on cwfs model |
publisher |
JVE International |
series |
Journal of Vibroengineering |
issn |
1392-8716 2538-8460 |
publishDate |
2019-06-01 |
description |
In order to study the mechanical response of a hard rock tunnel excavated by double shield tunnel boring machine (DS-TBM), a numerical method was introduced to simulate the TBM excavating process. The failure modes of surrounding rock mass described based on the cohesion weakening and frictional strengthening (CWFS) Mohr-Coulomb strain-softening criterion. The characteristics of stress field and plastic zone on the cross and longitudinal section of the tunnel were analyzed in detail, and the results were compared with those in the intrinsic condition (when TBM model is not activated). The simulation results indicate that the stress paths at the vault are relatively simple, and the stress concentration caused by excavation unloading is obviously reduced by lining and backfill grouting, while the sidewall is less disturbed by the excavation of TBM. The invert experiences three unloading processes, due to excavation, the contact between the rear shield and the bottom of surrounding rock, as well as backfill grouting at gap between the lining and the rock mass. The vault has a larger plastic zone than the invert, attributing to the geometrical difference between the cutter-head and the front shield, as well as the conicity of the front and rear shields. The area of plastic zones gradually increases along the tunnel route, but it becomes stable after the rear shield. |
topic |
double shield tunnel boring machine CWFS model nonuniform gap stress field plastic zone |
url |
https://www.jvejournals.com/article/19884 |
work_keys_str_mv |
AT diyuanli numericalanalysisofhardrocktunnelexcavatedbydoubleshieldtbmbasedoncwfsmodel AT jingsun numericalanalysisofhardrocktunnelexcavatedbydoubleshieldtbmbasedoncwfsmodel AT quanqizhu numericalanalysisofhardrocktunnelexcavatedbydoubleshieldtbmbasedoncwfsmodel AT xiangyunxu numericalanalysisofhardrocktunnelexcavatedbydoubleshieldtbmbasedoncwfsmodel AT jianjiao numericalanalysisofhardrocktunnelexcavatedbydoubleshieldtbmbasedoncwfsmodel |
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1725200710237159424 |