Development and validation of a 3D numerical model for TBM–EPB mechanised excavations

Lambrughi, Angelo; Rodríguez, Luís E.; Castellanza, Riccardo

doi:10.1016/j.compgeo.2011.10.004

Cited by 140 publications

(40 citation statements)

References 28 publications

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“…The TBM shield is assumed as a cylindrical shape with conicity ignored [29]. Due to the presence of the cutter-head as well as chamber, the elastic modulus and thickness of the shield in the models are 10 and 2 times greater than those in Table 2, respectively [30].…”

Section: Characteristics Of Three-dimensional Entitymentioning

confidence: 99%

“…The mechanism of over-excavation for articulated TBM shield is illustrated in Figure 5, where LM1 and LM2 are the lengths of front shield body and rear shield body, respectively [32]. Considering promptly support after excavation, it is assumed that the overcutting ω is equal to one-third of the theoretical value (Ga) [33,34]: The TBM shield is assumed as a cylindrical shape with conicity ignored [29]. Due to the presence of the cutter-head as well as chamber, the elastic modulus and thickness of the shield in the models are 10 and 2 times greater than those in Table 2, respectively [30].…”

Section: Characteristics Of Three-dimensional Entitymentioning

confidence: 99%

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Influence of Approaching Excavation on Adjacent Segments for Twin Tunnels

Zhang

et al. 2019

Applied Sciences

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This paper aims at influence analysis of approaching excavation on adjacent segments for twin tunnels with variable clear spacing located in Beijing, China. A series of numerical simulations have been conducted to investigate the influence of approaching excavation on ground displacements and mechanical responses of segments. What's more, on-site monitoring was conducted at the position of the minimum spacing between the twin tunnels. It is found that the deformation of the measured segment presents a pronounced asymmetric ovalization when the second tunnel approaches the measured cross-section. During the approaching excavation of the second tunnel, the normal force increases gradually, whereas the bending moment first decreases and then increases. The maximum increments of internal forces in the measured segment are both located at the regions near the second tunnel, in which the springline and shoulder of the segment are mainly subject to the effect of the circumferential compression and axial tension. The approaching excavation reduces the horizontal displacements of the ground between twin tunnels and increases the ground settlements as well as the horizontal displacements of the ground on both sides. The actual tunneling case of first along the curved trajectory and then along the straight-line trajectory can reduce internal forces of the segment.Liang et al. [10] obtained the unloading vertical stress field beneath the new tunnel based on Mindlin solutions [11]. Kong et al. [12] obtained the analytical solution of the displacement field of twin tunnels by using the Schwartz alternating theory. The ground settlements during the construction of twin tunnels were predicted by the experimental and numerical methods [1,[13][14][15]. The influence of the interaction between twin tunnels on the horizontal and vertical ground displacements will induce the variations of structural forces during the approaching excavation [16].The field measurement on the strain (or stress) increments in the segment induced by the approaching excavation were carried out by Gao et al. [9]. Unfortunately, comparative and parametric analyses have not been implemented via numerical or analytical methods [17][18][19][20][21]. The finite element modeling was performed to predict the influence of approaching excavation on the ground displacements and the structural forces in the segment of twin tunnels [22][23][24]. However, the construction loadings (e.g., friction force, jacking force, grouting pressure, etc.) were not simulated in detail. Note that the lateral spacing between twin tunnels in the above investigations is constant along the tunneling direction, while this condition of equal spacing is often subject to other factors and cannot meet in actual engineering.In this paper, twin tunnels with variable clear spacing is taken as a case study. The meticulously and completely real-time monitoring on the adjacent segment has been carried out. Furthermore, the influence of the tunnel approaching excavation on the internal forces of the...

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Section: Characteristics Of Three-dimensional Entitymentioning

confidence: 99%

Section: Characteristics Of Three-dimensional Entitymentioning

confidence: 99%

Influence of Approaching Excavation on Adjacent Segments for Twin Tunnels

Zhang

et al. 2019

Applied Sciences

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“…However, less works have been devoted to its effect on the tunnel lining behaviour. Generally, simple constitutive models lead to a shallower and wider settlement trough than the one observed experimentally (Bolton et al, 1994;Addenbrooke et al, 1997;Masin and Herle, 2005;Hejazi et al, 2008;Rodriguez, 2008;Lambrughi et al, 2012). Their studies indicate that in order to take into account some of the fundamental aspects of soil behavior, such as the variation inthe stiffness modulus, according to the stress state and the difference in the modulus during the unloading and loading phases, it is at least necessary to use an elasto-plastic model with strain hardening.…”

Section: Ajasmentioning

confidence: 99%

“…In this study, the face pressure has been modelled by applying a pressure distribution to the excavation face (Melis et al, 2002;Kasper and Meschke, 2004;Mroueh and Shahrour, 2008;Lambrughi et al, 2012;Mollon et al, 2013), using a trapezoidal profile in order to account of the slurry density. The unit weight of the slurry is taken equal to 11 kN/m 3 .…”

Section: Simulation Of Different Phases Of the Mechanized Tunnelling mentioning

confidence: 99%

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

Anh

Dias

Oreste³

et al. 2013

American Journal of Applied Sciences

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The main purpose of this study was to provide a three-dimensional numerical model which would allow to show the influence of the constitutive model of the ground on the tunnel lining behaviour and displacement field surrounding the tunnel. Most of the processes that occur during mechanized excavation have been simulated in this model. Besides the well-known elastic linear perfectly plastic model with Mohr Coulomb failure criteria (MC), the Cap-Yield model (CYsoil), which is a strain hardening constitutive model that takes into consideration the hyperbolic behaviour of the soil has also been adopted. The results have shown a considerable effect of the constitutive model on the tunnel behavior and the ground displacement field. Generally, the CYsoil model produces higher structural force and ground settlement values than those predicted by the MC model.

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“…In the last few years, the numerical analyses are increasingly used in the design of the underground structures [1][2][3][4][5][6][7][8]. The designers can work with different userfriendly commercial software and relatively easy simulate the behaviour of the soil mass.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of the Soil Behaviour by Using Newly Developed Advanced Material Model

Vesely

2017

Acta Polytech

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Abstract. This paper describes a theoretical background, implementation and validation of the newly developed Jardine plastic hardening-softening model (JPHS model), which can be used for numerical modelling of the soils behaviour. Although the JPHS model is based on the elasto-plastic theory, like the Mohr-Coulomb model that is widely used in geotechnics, it contains some improvements, which removes the main disadvantages of the MC model. The presented model is coupled with an isotopically hardening and softening law, non-linear elastic stress-strain law, non-associated elasto-plastic material description and a cap yield surface. The validation of the model is done by comparing the numerical results with real measured data from the laboratory tests and by testing of the model on the real project of the tunnel excavation. The 3D numerical analysis is performed and the comparison between the JPHS, Mohr-Coulomb, Modified Cam-Clay, Hardening small strain model and monitoring in-situ data is done.

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Development and validation of a 3D numerical model for TBM–EPB mechanised excavations

Cited by 140 publications

References 28 publications

Influence of Approaching Excavation on Adjacent Segments for Twin Tunnels

Influence of Approaching Excavation on Adjacent Segments for Twin Tunnels

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

Numerical Modelling of the Soil Behaviour by Using Newly Developed Advanced Material Model

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