Tunnel modelling: Stress release and constitutive aspects

Dias, Tiago Gerheim Souza; Bezuijen, Adam

doi:10.1201/b17240-37

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The increase in the stiffness (mainly for K 0 <1), and the initial mean stress (more significantly for K 0 <1) results in a lesser surface volume loss. This is consistent with the findings of Dias and Bezuijen . They pointed out that for the isotropic state ( K 0 =1), the variation of stress is dominated by the stress in the deviatoric direction during tunneling process.…”

Section: Influence Of Important Factors On the Tunneling Induced Grousupporting

confidence: 92%

“…This is consistent with the findings of Dias and Bezuijen. 49 They pointed out that for the isotropic state (K 0 =1), the variation of stress is dominated by the stress in the deviatoric direction during tunneling process. For the other states, the responses are distinguishable on whether the vertical stress is the initial major ( 1 ) or minor ( 3 ) principle stress where the normal stress to the tunnel is 3 at tunnel crown for high value of K 0 and at tunnel side for low value of K 0 .…”

Section: Effect Of Kmentioning

confidence: 99%

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Mechanized tunneling induced ground movement and its dependency on the tunnel volume loss and soil properties

Zhao

Lavasan

Thomas³

et al. 2019

Num Anal Meth Geomechanics

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Summary This study investigates the ground movements due to mechanized tunnel excavation by applying two‐dimensional finite element analyses. To assess the contribution of the compressibility and plasticity of the soil on the ground movements, different constitutive models are employed to describe the soil behavior. The influence of volume loss around the tunnel on the surface volume loss is investigated, and a quadratic correlation between them is proposed. Consequently, the empirical Gaussian distribution curve, which is generally used to determine the tunneling induced settlement trough, is improved by applying the proposed quadratic correlation between surface volume loss and tunnel volume loss. Furthermore, the settlement trough width parameter has been derived by a linear function of tunnel volume loss as well. The proposed equations are validated via a case study of centrifuge tests from the literature. The results show that the proposed modification enhances the empirical solution by having better knowledge on the model parameters. Additionally, tunnel overburden and coefficient of lateral earth pressure at rest (K0) are taken into account to study their influence on the tunneling induced surface settlements. Finally, global sensitivity analysis is applied to evaluate the relative importance of corresponding model parameters in terms of their influence on the ground movements.

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Section: Influence Of Important Factors On the Tunneling Induced Grousupporting

confidence: 92%

Section: Effect Of Kmentioning

confidence: 99%

Mechanized tunneling induced ground movement and its dependency on the tunnel volume loss and soil properties

Zhao

Lavasan

Thomas³

et al. 2019

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…where w is the width of the mesh, D is the diameter of the tunnel, and H is the height from the ground surface to the [25]) and eld measurement (Möller and Vermeer [26]). e boundary conditions are selected as viscous for the lateral boundaries, while the top boundary is taken as free as has been proposed in the literature to accurately capture the deformation phenomena.…”

Section: Mesh Dimensions and Boundary Conditionsmentioning

confidence: 99%

Ground Settlements due to Construction of Triplet Tunnels with Different Construction Arrangements

Naseem

Schotte

Pauw

et al. 2019

Advances in Civil Engineering

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Combining two or three shield tunnels that are drilled consecutively at small intermediate distances into a single open cross section creates a larger useful tunnel area, while keeping the total construction area rather compact. However, the combination of several bored tunnel tubes into a singular cross section results in a complicated construction procedure. Current methodologies address the evaluation of the settlement trough for one single tunnel or two parallel tunnels only. This study aims at expanding the current methodologies to the multiple-tunnel geometry. Various construction orders and intermediate distances between the tunnels are evaluated using finite element analyses. The grout pressure method is applied in combination with the hardening strain with the small strain stiffness (HS small) constitutive model to investigate the relative magnitude of the settlements due to shield tunneling. It is concluded that the configuration with a Top-Left-Right construction sequence is the optimal arrangement. It results in 22.4% and 36.9% lesser settlements when compared to the equivalent horizontal twin tunnels spaced at 3D and the Left-Right-Top sequence, respectively.

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“…In particular, the use of such a constitutive model produces a more realistic ground settlement profile and leads to a surface settlement trough which better represents the observed data. [10] showed that the surface settlements and their relation to the volume losses measured on the tunnel boundary were significantly different among different models, especially between the models with linear and non-linear stress-strain relations.…”

mentioning

confidence: 98%

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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Tunnel modelling: Stress release and constitutive aspects

Cited by 7 publications

References 12 publications

Mechanized tunneling induced ground movement and its dependency on the tunnel volume loss and soil properties

Mechanized tunneling induced ground movement and its dependency on the tunnel volume loss and soil properties

Ground Settlements due to Construction of Triplet Tunnels with Different Construction Arrangements

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

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