Numerical Modelling of Face Extrusion in Shield Tunnelling Through Squeezing Ground
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Date
2023
Publication Type
Conference Paper
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yes
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Abstract
This paper investigates the interaction between tunnel boring machine (TBM) and ground under severe squeezing conditions, characterized by very large deformations of the ground at and ahead of the tunnel face. The effect of core extrusion is studied considering undrained conditions. In order to quantify the ground extrusion at the tunnel face during the TBM advance, a novel step-by-step numerical procedure was developed, based on the finite element method (FEM), considering material and geometric nonlinearities, and employing re-meshing and stress re-mapping techniques. The numerical analyses show that the volume of the excavated ground may considerably exceed the tunnel volume and this although the tunnel face is stable. This is because the TBM excavates also the ground that enters into the tunnel cross-section ahead of the tunnel face and extrudes during
advance at the face. Under extreme conditions the additional excavation volume may reach 0–100% of the tunnel volume.
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published
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Book title
Challenges and Innovations in Geomechanics
Journal / series
Volume
288
Pages / Article No.
422 - 429
Publisher
Springer
Event
16th International Conference of the International Association for Computer Methods and Advances in Geomechanics (IACMAG 2022)
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03655 - Anagnostou, Georgios (emeritus) / Anagnostou, Georgios (emeritus)