Numerical investigation of tunneling in saturated soil: the role of construction and operation periods

Lavasan, Arash Alimardani; Zhao, Chenyang; Thomas, Benedict; Schaufler, Alexander; Steeb, Holger; Schanz, Tom

doi:10.1007/s11440-017-0595-4

Cited by 45 publications

(7 citation statements)

References 41 publications

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“…In the present study, the initial face pressure and grouting pressure are determined according to Lavasan et al. (). To be specific, the applied face pressures are slightly higher than the lateral earth pressures at same depth (linearly increases from 88 kPa at crown toward 190 kPa at invert).…”

Section: Validation Of Hybrid Modeling For 3d Tunneling Simulationmentioning

confidence: 99%

A hybrid model for estimation of ground movements due to mechanized tunnel excavation

Zhao

Hölter

König

et al. 2019

Computer aided Civil Eng

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To provide realistic predictions of mechanized tunnel excavation‐induced ground movements, this research develops an innovative simulation technique called hybrid modeling that combines a detailed process‐oriented finite element (FE) simulation (submodel) with the computational efficiency of metamodel (or surrogate model). This hybrid modeling approach has three levels. In Level 1, a small scale submodel is cut out from the global model and the continuous simulations are conducted in this submodel. Level 2 deals with identification of uncertain soil parameters based on the measurements (e.g., surface settlements) during tunnel excavation. In Level 3, the tunneling process parameters (e.g., grouting pressure) can be optimized to control tunneling‐induced ground movements or building deformations according to the design criterion. The proposed hybrid modeling approach is validated via a 3D numerical simulation of mechanized tunnel excavation. The results show the capability of the proposed approach to provide reliable model responses in the near field around the tunnel with reduced computational costs.

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Section: Validation Of Hybrid Modeling For 3d Tunneling Simulationmentioning

confidence: 99%

A hybrid model for estimation of ground movements due to mechanized tunnel excavation

Zhao

Hölter

König

et al. 2019

Computer aided Civil Eng

Self Cite

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“…Ma et al [15] discussed the influence of construction sequence on the existing structure by numerical simulation. Lavasan a et al [16] found that different backfill grouting simulation methods have little impact on the axial force of lining whereas the longitudinal stiffness of the existing tunnel lining is one of the major factors affecting the deformation. Liao [17] improved the traditional equivalent stiffness model by considering the influence range of the circumferential seam.…”

Section: Introductionmentioning

confidence: 99%

Deformations of Subway Tunnels Induced by the Overcrossing Jacked Box Tunnels

Liu

Huajing

et al. 2021

Symmetry

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The rectangular utility tunnels have been increasingly built in urban areas in recent decades. In this paper, a case of jacked box tunnels built closely over-crossing the existing subway tunnels in Suzhou, China, is presented. The tunneling-induced deformation of the subway tunnels is measured and analyzed. The measurement indicates that the subway tunnels are uplifted and subjected to the overcrossing box tunneling. As compared, the longitudinal deformation of the range that locates under the box tunnels is more significant than that outside the range. The tunneling-induced deformation of the left subway tunnel is relatively higher than that of the right one. The numerical simulation is performed for validation. The numerical result is agreed with the in-situ measurements. Moreover, the simulation reveals that the presence of friction in jacked tunnels causes the extra uplift deformation of subway tunnels. The higher the friction, the is the deformation. It is affirmed that using the effective lubrication not only facilitates the tunnel jacking but also inabilities the tunneling-induced deformation of underlying tunnels.

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“…As large-scale underground tunneling equipment, the slurry shield machine has been widely used in cross-river tunnels, water projects, and urban rail transit engineering [1][2][3]. The shield slurry system is key to ensuring the stability of the excavating face and the degree of ballast transportation, and the system is mainly composed of a feeding line section and a discharging line section, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Ballast Flow Characteristics of Discharging Pipeline in Shield Slurry System

et al. 2019

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We adopted two-way coupling of discrete and finite elements to examine the non-spherical ballast flow characteristics in a slurry pipe system during a shield project. In the study, we considered the slurry rheological property and the flake shape of the ballast. A ballast size between 17 and 32 mm under different slurry flow rates and ballast volumetric concentration conditions was investigated for determining the law through which the mass flow rate, detained mass percentage, and ballast distribution state are influenced. The results indicate that increasing slurry flow rate and the ballast volumetric concentration increase the mass flow rate; the influence of the latter is stronger. Increases in both in the slurry flow rate and the ballast volumetric concentration can reduce the detained mass percentage in the slurry discharging pipeline, whereas increasing the ballast size has the opposite effect. The increase in both the slurry flow rate and the ballast size changes the ballast motion state. Experiments verified the numerical lifting model of the ballast in the vertical pipeline. The measurements of the actual pipeline wall thickness verified that the simulation results regarding the ballast distribution were accurate.

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Numerical investigation of tunneling in saturated soil: the role of construction and operation periods

Cited by 45 publications

References 41 publications

A hybrid model for estimation of ground movements due to mechanized tunnel excavation

A hybrid model for estimation of ground movements due to mechanized tunnel excavation

Deformations of Subway Tunnels Induced by the Overcrossing Jacked Box Tunnels

Ballast Flow Characteristics of Discharging Pipeline in Shield Slurry System

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