Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical Modelling of Face Extrusion in Shield Tunnelling Through Squeezing Ground
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 50–100% of the tunnel volume.
Numerical Modelling of Face Extrusion in Shield Tunnelling Through Squeezing Ground
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 50–100% of the tunnel volume.
Numerical Modelling of Face Extrusion in Shield Tunnelling Through Squeezing Ground
Lecture Notes in Civil Engineering
Barla, Marco (Herausgeber:in) / Di Donna, Alice (Herausgeber:in) / Sterpi, Donatella (Herausgeber:in) / Insana, Alessandra (Herausgeber:in) / Pferdekämper, Thomas (Autor:in) / Vrakas, Apostolos (Autor:in) / Anagnostou, Georgios (Autor:in)
International Conference of the International Association for Computer Methods and Advances in Geomechanics ; 2022 ; Turin, Italy
31.07.2022
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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