3d Modelling for Mechanized Tunnelling in Soft Ground-Influence of the Constitutive Model

Anh, Ngoc; Dias, Daniel; Oreste, Pierpaolo; Djéran-Maigre, Irini

doi:10.3844/ajassp.2013.863.875

Cited by 21 publications

(2 citation statements)

References 20 publications

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“…The use of TBMs generally requires the insertion of a particular type of tunnel support structure: the segmental lining (Fig. 1) (Do et al 2013(Do et al , 2014(Do et al , 2015Zaheri et al 2020).…”

Section: Introductionmentioning

confidence: 99%

The Buoyancy of the Tunnel Segmental Lining in the Surrounding Filling Material and its Effects on the Concrete Stress State

Han

Oreste

2022

Geotech Geol Eng

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Segmental lining is subject to significant upward buoyancy forces when a grouting material (slurry), initially fluid, is adopted to fill the gap between its external profile and the wall of a tunnel excavated with a TBM machine. The analysis of the effects of these forces is important in order to correctly dimension the segmental lining and avoid damage to the lining and subsequent costly maintenance and restoration actions. Given the complexity of the behavior of a segmental lining consisting of segmental rings and circular joints that alternate in the longitudinal direction of the tunnel, a specific numerical model has been implemented, adopting the Finite Element Method (FEM). This model is able to obtain the development of the vertical displacements of the segmental lining starting from the TBM tail, together with the bending moments and the shear forces induced inside it. The developed model is able to assess the risks of breaking and damaging the concrete and steel bolts that are used to connect the segmental rings at the circular joints; therefore, it represents a useful design tool for being able to correctly dimension the segmental lining also in relation to the risks produced by the appearance of considerable buoyancy forces around it, due to the presence of the initially fluid filling material. The proposed numerical model was applied to a real case (Ningbo metro tunnel) and allowed to obtain satisfactory results from the comparison of the calculated displacements with in situ measurements. Some sensitivity analyzes developed on the studied case have made it possible to detect which are the influencing parameters that have the greatest impact on the behavior of segmental lining in the presence of the studied buoyancy forces.

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Section: Introductionmentioning

confidence: 99%

The Buoyancy of the Tunnel Segmental Lining in the Surrounding Filling Material and its Effects on the Concrete Stress State

Han

Oreste

2022

Geotech Geol Eng

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“…The maximum settlement induced by the TBM excavation occurs at the end tail of the shield which is the place of grouting [7] . The constitutive model has a great influence on describing tunnel behaviour and ground displacement [8]. The proper use of the constitutive model leads to a very good agreement between modelling and measurement.…”

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confidence: 99%

Analysis of surface settlements induced by tunnel excavation with EPB-TBM

Mekahlia¹,

Khadri²,

Bensehamdi³

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. To investigate the efficiency of various approaches to predict surface settlements due to tunnel excavation. Methodology. To appreciate the surface displacements, our study is focalized on the case of a real tunnel in a layered ground (Algiers’s Metro), where a tunnel boring machine was driven for the first time in this country. Firstly, the surface settlement trough was calculated with empirical, analytical, and numerical (FEM) methods. Secondly, a set of numerical analyses was carried out to inspect the evolution of surface settlement as the TBM progresses. Finally, a parametric study was performed to examine the construction step most productive for surface settlement. Findings. FEM is a useful tool for predicting surface displacements due to tunnelling, especially when assigning an adequate and sophisticated behaviour model. Originality. A reference numerical model which represents well the construction procedures of the Algiers tunnel has been established. Practical value. This study illustrates that the results obtained by FEM with the use of Hardening Soil as a constitutive model to represent the soil are almost identical to those measured during the tunnel excavation. On the other hand, the empirical formulas available in the literature are not always efficient to predict surface movements.

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SSI Analysis in Geotechnical Engineering Problems Using a Finite Difference Method

Dias¹,

Jenck²

2021

Deterministic Numerical Modeling of Soil–Structure Interaction

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3d Modelling for Mechanized Tunnelling in Soft Ground-Influence of the Constitutive Model

Cited by 21 publications

References 20 publications

The Buoyancy of the Tunnel Segmental Lining in the Surrounding Filling Material and its Effects on the Concrete Stress State

The Buoyancy of the Tunnel Segmental Lining in the Surrounding Filling Material and its Effects on the Concrete Stress State

Analysis of surface settlements induced by tunnel excavation with EPB-TBM

SSI Analysis in Geotechnical Engineering Problems Using a Finite Difference Method

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