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GeoStudio | PLAXIS Wiki PLAXIS 3D Tutorial 05: Phased excavation of a shield tunnel
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              • PLAXIS 3D Tutorial 04: Stability of a diaphragm wall excavation
              • PLAXIS 3D Tutorial 05: Phased excavation of a shield tunnel
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    PLAXIS 3D Tutorial 05: Phased excavation of a shield tunnel

    Application PLAXIS 3D
    Version PLAXIS 3D
    Date created 04 October 2018
    Date modified 12 October 2022

    The lining of a shield tunnel is often constructed using prefabricated concrete ring segments, which are bolted together within the tunnel boring machine to form the tunnel lining. During the erection of the tunnel lining the tunnel boring machine (TBM) remains stationary. Once a tunnel lining ring has been fully erected, excavation is resumed, until enough soil has been excavated to erect the next lining ring. As a result, the construction
    process can be divided in construction stages with a length of a tunnel ring, often about 1.5 m long. In each of these stages the same steps are repeated over and over again.

    In order to model this, a geometry consisting of slices each 1.5 m long can be used. The calculation consists of a number of Plastic phases, each of which models the same parts of the excavation process: the support pressure at the tunnel face needed to prevent active failure at the face, the conical shape of the TBM shield, the excavation of the soil and pore water within the TBM, the installation of the tunnel lining and the grouting of the gap between the soil and the newly installed lining. In each phase the input for the calculation phase is identical, except for its location, which will be shifted by 1.5 m each phase.

    Tutorial case files

    • Green book PLAXIS 3D CEV22.02 Tutorial 05: Phased excavation of a shield tunnel.pdf
    • Green book PLAXIS 3D CEV22.01 Tutorial 06: Phased excavation of a shield tunnel.pdf
    • Green book PLAXIS 3D CEV22 Tutorial 06: Phased excavation of a shield tunnel.pdf
    • Green book PLAXIS 3D CEV21 Tutorial 06: Phased excavation of a shield tunnel.pdf

    Command log files

    • Notepad spiral PLAXIS 3D CEV22.02 Tutorial 05: Phased excavation of a shield tunnel.p3dlog
    • Notepad spiral PLAXIS 3D CEV22.01 Tutorial 06: Phased excavation of a shield tunnel.p3dlog
    • Notepad spiral PLAXIS 3D CEV22 Tutorial 06: Phased excavation of a shield tunnel.p3dlog
    • Notepad spiral PLAXIS 3D CEV21 Tutorial 06: Phased excavation of a shield tunnel.p3dlog

      This exercise requires the activation of the Geotechnical SELECT entitlements [GSE] in order to be able to use the tunnel designer.

    The attached *.p3dlog file contains all the commands to generate the model. With a Bentley Geotechnical SELECT Entitlement [GSE] licence, you can use the commands runner to open the *.p3dlog file and to execute all commands in one go, see also this instruction.

    Downloads

    • PLAXIS 3D 2018 - Tutorial Lesson 06.pdf
    • PLAXIS 3D 2018 - Tutorial Lesson 06.p3dlog [command log file]

    See also

    Track previous  PLAXIS 3D Tutorial 04: Stability of a diaphragm wall excavation   [Tutorials]


    Track next  PLAXIS 3D Tutorial 06: Construction of a road embankment   [Tutorials]


    PLAXIS 3D Tunnel Designer   [Videos]

    • PLAXIS 3D
    • tunnel lining
    • shield tunnel
    • contraction
    • PLAXIS
    • Tunnel
    • tunnel designer
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    • Micha van der Sloot Created by Bentley Colleague Micha van der Sloot
    • When: Wed, Dec 18 2019 10:46 AM
    • Felipe Fonseca Last revision by Bentley Colleague Felipe Fonseca
    • When: Thu, Oct 13 2022 4:12 AM
    • Revisions: 8
    • Comments: 0
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