Structural forces in segmental linings: process-oriented tunnel advance simulations vs. conventional structural analysis

Marwan, Ahmed; Gall, Vojtech; Alsahly, Abdullah; Meschke, Günther

doi:10.1016/j.tust.2021.103836

Cited by 13 publications

(4 citation statements)

References 25 publications

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“…An alternative assessment of the stresses in segmented lining shells is to include the staged excavation and tunnel advancement process and the segment‐wise installation of the tunnel lining directly in a complete 3D process‐oriented simulation. Such a model has been proposed in 17 . In the present analysis of the tunnel linings independent from the ground and soil‐structure interaction model, dissipative processes are a priori excluded.…”

Section: Discussion and Possible Extensionsmentioning

confidence: 99%

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A variationally consistent hyperstatic reaction method for tunnel lining design

Bui

Ninić

Anh

et al. 2021

Num Anal Meth Geomechanics

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In this technical note, a consistent finite element formulation of the Hyperstatic Reaction Method (HRM) for tunnel linings design is proposed by introducing a variational consistently linearized formulation. It permits to consider a nonlinear interaction between a lining structure and the surrounding ground. Recent advances of the HRM in regard to the consideration of the nonlinear response of the segmented tunnel lining exposed to design loads use an iterative algorithm for solving the nonlinear system of equations. In the proposed Variationally consistent Hyperstatic Reaction Method (VHRM), a distributed nonlinear spring model representing the interaction between the lining and the ground soils is considered in a variationally consistent format. Computing the tangential spring stiffness via consistent linearization, and using Newton-Raphson iteration, requires significantly smaller number of iterations as compared to the original HRM model based on nodal springs. Furthermore, the method is applicable for simulations using solid finite elements (2D and 3D), as well as beam or finite shell elements, respectively.

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Section: Discussion and Possible Extensionsmentioning

confidence: 99%

“…Such a model has been proposed in. 17 In the present analysis of the tunnel linings independent from the ground and soil-structure interaction model, dissipative processes are a priori excluded. To account for material anisotropy, the spring forces have to be reformulated to include the anisotropic effect.…”

Section: Discussion and Possible Extensionsmentioning

confidence: 99%

A variationally consistent hyperstatic reaction method for tunnel lining design

Bui

Ninić

Anh

et al. 2021

Num Anal Meth Geomechanics

Self Cite

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“…These factors must be considered when simulating mechanised excavation in FLAC3D. Multiple researchers have incorporated these variables into their numerical model [73][74][75][76][77]. The progression of EPB advancement in Seville has been modelled in this study, and an attempt has been made to model it using significant factors from the step-by-step excavation.…”

Section: Simulation Processesmentioning

confidence: 99%

“…, where G and K represent the shear and bulk modulus, respectively. ΔZ min is the zone's smallest typical dimension of grout attached [69,74].…”

Section: Numerical Simulation Of the Liningmentioning

confidence: 99%

Numerical Model Validation for Detection of Surface Displacements over Twin Tunnels from Metro Line 1 in the Historical Area of Seville (Spain)

et al. 2022

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In order to solve connectivity problems in metropolitan areas, the development of underground metro lines constitutes an unquestionable requirement. However, the construction work thereof encounters unfavourable circumstances when surface excavations must be carried out that cross historical areas of the city, due to the need to control surface movements. The design of the metro in the city of Seville (Spain) from 2004 to 2006 provides a representative example of this situation and triggered major upheavals that exerted repercussions on historical buildings. For these reasons, the excavation stages of Line 1 of this metro have been simulated by numerical methods using FLAC3D software and validated with the results provided by the real conditions. Consequently, various surface settlements have been evaluated by taking not only variates of the main parameters that characterise the soil of Seville, but also of the various load situations and excavation conditions. Notable results have been achieved through calibration of 54 variants of the same model corresponding to Line 1, and their comparison with the real results obtained in nine critical areas of the itinerary. The results obtained have made it possible to determine the effects of excavation on the subsoil of the city of Seville with great accuracy, since the percentage error of calculated vertical surface movements varies from 0.1% to 5.3%.

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