Bentley Communities
Bentley Communities
  • Site
  • User
  • Site
  • Search
  • User
  • Welcome
  • Products
  • Support
  • About
  • More
  • Cancel
GeoStudio | PLAXIS
  • Product Communities
GeoStudio | PLAXIS
GeoStudio | PLAXIS Wiki PLAXIS 2D Tutorial 18: Freeze pipes in tunnel construction
    • Sign In
    • -Geotechnical Analysis Wiki
      • +GeoStudio
      • -PLAXIS
        • +Software and License - PLAXIS
        • -Documentation - PLAXIS
          • +Manuals - PLAXIS
          • -Tutorials - PLAXIS
            • -Tutorials PLAXIS 2D
              • PLAXIS 2D Tutorial 01: Settlement of a circular footing on sand
              • PLAXIS 2D Tutorial 02: Drained and undrained stability of an embankment
              • PLAXIS 2D Tutorial 03: Submerged construction of an excavation
              • PLAXIS 2D Tutorial 04: Settlements due to tunnel construction
              • PLAXIS 2D Tutorial 05: Excavation of an NATM tunnel
              • PLAXIS 2D Tutorial 06: Dry excavation using a tie back wall
              • PLAXIS 2D Tutorial 07: Dry excavation using a tie back wall - ULS
              • PLAXIS 2D Tutorial 08: Construction of a road embankment
              • PLAXIS 2D Tutorial 09: Excavation and dewatering
              • PLAXIS 2D Tutorial 10: Cyclic vertical capacity and stiffness of circular underwater footing
              • PLAXIS 2D Tutorial 11: Flow through an embankment
              • PLAXIS 2D Tutorial 12: Potato field moisture content
              • PLAXIS 2D Tutorial 13: Stability of dam under rapid drawdown
              • PLAXIS 2D Tutorial 14: Dynamic analysis of a generator on an elastic foundation
              • PLAXIS 2D Tutorial 15: Pile driving
              • PLAXIS 2D Tutorial 16: Free vibration and earthquake analysis of a building
              • PLAXIS 2D Tutorial 17: Thermal expansion of a navigable lock
              • PLAXIS 2D Tutorial 18: Freeze pipes in tunnel construction
              • PLAXIS 2D Tutorial: Stabilisation of a rock slope
            • +Tutorials PLAXIS 3D
            • Slope stability for road construction project: using FEM and LEM [PLAXIS LE]
            • Slope stability for road construction project: using FEM and LEM [PLAXIS and GeoStudio]
          • +Verifications - PLAXIS
        • +API / Python scripting - PLAXIS
        • +Known issues - PLAXIS
        • +Models - PLAXIS
        • +Tips and Tricks
        • +Publications
        • +Videos - PLAXIS
      • +PLAXIS Monopile Designer
      • +PLAXIS LE
      • +SOILVISION
      • +Geotechnical SELECT Entitlements [GSE]
      • +Subscription Entitlement Service

     
     Questions about this article, topic, or product? Click here. 

    PLAXIS 2D Tutorial 18: Freeze pipes in tunnel construction

    Application PLAXIS 2D
    Version PLAXIS 2D
    Date created 20 May 2017
    Date modified 27 Feb 2023

    This tutorial illustrates change in coupling of groundwater flow and thermal flow as a result of ground freezing. A tunnel is constructed with the use of freeze pipes. By first installing freeze pipes in the soil, the soil freezes and becomes watertight so that tunnel construction can take place. This method of construction requires a lot of energy for the cooling of the soil, so by being able to model the cooling behaviour while groundwater flow is present an optimal freezing system can be designed.

    In this tutorial a tunnel with a radius of 3.0 m will be constructed in a 30 m deep soil layer. A groundwater flow from left to right is present, influencing the thermal behaviour of the soil. First the soil will be subjected to the low temperatures of the freeze pipes, and once the soil has frozen sufficiently, tunnel construction can take place. The latter is not included in this tutorial.

    Because groundwater flow causes an asymmetric temperature distribution, the whole geometry needs to be modelled,  where in previous examples only half of the geometry was sufficient.

    Objectives:

    • Modelling soil freezing, coupling between thermal flow and groundwater flow
    • Modelling unfrozen water content.
    • Using the command line for structure definition.

    Figure 1. Temperature distribution for a transient calculation



    This exercise requires a PLAXIS 2D Ultimate license to access the Thermal features.

    The attached *.p2dxlog 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 *.p2dxlog file and to execute all commands in one go, see also this instruction.

    Downloads

    • Green book PLAXIS 2D 2023.1 - Tutorial 18.pdf - instructions
    • Notepad spiral PLAXIS 2D 2023.1 - Tutorial 18.p2dxlog [command log file]
    • Green book PLAXIS 2D CE V22.02 - Tutorial 18.pdf - instructions
    • Notepad spiral PLAXIS 2D CE V22.02 - Tutorial 18.p2dxlog [command log file]
    • Green book PLAXIS 2D CE V22.01 - Tutorial 18.pdf - instructions
    • Notepad spiral PLAXIS 2D CE V22.01 - Tutorial 18.p2dxlog [command log file]
    • Green book PLAXIS 2D CE V22 - Tutorial 18.pdf - instructions
    • Notepad spiral PLAXIS 2D CE V22 - Tutorial 18.p2dxlog [command log file]
    • Green book PLAXIS 2D CE V21 - Tutorial 18.pdf - instructions
    • Notepad spiral PLAXIS 2D CE V21 - Tutorial 18.p2dxlog [command log file]
    • PLAXIS 2D 2018 - Tutorial Lesson 16.pdf
    • PLAXIS 2D 2018 - Tutorial Lesson 16.p2dxlog [command log file]
    • LineCoordinatesCommands.p2dxlog for PLAXIS 2D 2018

    See also

    Scientific Manual PLAXIS 2D - Thermal and coupled THM analysis    [Publications]


    2D Thermal analysis of soil freezing with flowing water    [Publications]


    PLAXIS 2D Tutorial 17: Thermal expansion of a navigable lock    [Tutorials]

    • Freeze
    • Ground freezing
    • heatpipe
    • PLAXIS
    • Thermal
    • heat
    • PLAXIS 2D
    • Freezing
    • Share
    • History
    • More
    • Cancel
    • Micha van der Sloot Created by Bentley Colleague Micha van der Sloot
    • When: Wed, Dec 18 2019 10:44 AM
    • Felipe Fonseca Last revision by Bentley Colleague Felipe Fonseca
    • When: Mon, Feb 27 2023 3:06 AM
    • Revisions: 11
    • Comments: 0
    Recommended
    Related
    Communities
    • Home
    • Getting Started
    • Community Central
    • Products
    • Support
    • Secure File Upload
    • Feedback
    Support and Services
    • Home
    • Product Support
    • Downloads
    • Subscription Services Portal
    Training and Learning
    • Home
    • About Bentley Institute
    • My Learning History
    • Reference Books
    Social Media
    •    LinkedIn
    •    Facebook
    •    Twitter
    •    YouTube
    •    RSS Feed
    •    Email

    © 2023 Bentley Systems, Incorporated  |  Contact Us  |  Privacy |  Terms of Use  |  Cookies