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    AI Overview
    A Slurry Balance Tunnel Boring Machine (TBM) is a closed-face, pressurized excavator used to dig tunnels in unstable, water-saturated ground, such as soft soils, sands, and gravel. It supports the tunnel face by pumping pressurized slurry (bentonite or water) into the cutter head chamber, preventing ground collapse and water inflow while simultaneously mining and transporting muck hydraulically. 
    Key Aspects of Slurry Balance TBMs: 
    • Face Support Mechanism: Pressurized slurry fills the excavation chamber to balance the external hydrostatic and earth pressure, ensuring stability in high-permeability and high-groundwater conditions.
    • Muck Removal: Excavated soil is mixed with the slurry and transported hydraulically through pipes to a separation plant outside the tunnel, where the slurry is filtered and reused.
    • Suitability: Ideal for unstable, water-bearing soils where precise settlement control is required to protect surface structures.
    • Slurry vs. EPB: Unlike Earth Pressure Balance (EPB) TBMs which use excavated soil to maintain pressure, Slurry TBMs are more suitable for coarser, higher-permeability soils. 
    These machines are essential for major infrastructure projects in dense urban areas, under rivers, or in complex underground conditions. 
    • What is a Slurry Tunnel Boring Machine? - Definition from Trenchlesspedia
      Oct 30, 2017 — A slurry tunnel boring machine (slurry TBM) is a large underground excavator that uses hydraulic means to remove excavated materia...
      Trenchlesspedia
    • Slurry TBM - CREG Germany
      Slurry TBM provide face support by pressurizing slurry in excavation chamber to balance soil and water pressure on working face. T...
      CREG TBM Germany GmbH
    • TBM selection - EPB and Slurry
      Oct 25, 2021 — Slurry TBMs and EPB TBMs are both used to control ground movement. They are often used in major tunnelling projects in soft ground...
      www.si-eng.org
    • 800mm Slurry Pressure Balance (SPB) Tbm Tunnel Boring Machine
      Details. ... slurry balanced microtunneling machine construction is the Underground pipeline construction which developped after s...
      Made-in-China.com
    • All About Tunnel Boring Machine – Components, Types & Advantages
      * Slurry Shield TBM. Slurry Shield TBMs are used when the ground conditions are granular with very high water pressure. Hydrostati...
      Encardio Rite
    • Slurry Balance Tunnel Boring Machine - NHI Global
      Slurry balance tunnel boring machine is well-suited for geological conditions featuring low groundwater pressure and high soil per...
      www.nhiglobalequip.com
    • What is a Slurry Tunnel Boring Machine? - Definition from Trenchlesspedia
      Oct 30, 2017 — A slurry tunnel boring machine (slurry TBM) is a large underground excavator that uses hydraulic means to remove excavated materia...
      Trenchlesspedia
    • Slurry TBM - CREG Germany
      Slurry TBM provide face support by pressurizing slurry in excavation chamber to balance soil and water pressure on working face. T...
      CREG TBM Germany GmbH
    • TBM selection - EPB and Slurry
      Oct 25, 2021 — Slurry TBMs and EPB TBMs are both used to control ground movement. They are often used in major tunnelling projects in soft ground...
      www.si-eng.org
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    Videos
    Slurry TBM
    YouTube · CREGA
    Jan 15, 2019
    YouTube · CREGA
    3:48
    CREGA
    YouTube·
    Jan 16, 2019

    Slurry TBM

    YouTube·CREGA·Jan 16, 2019
    YouTube
    How does Earth Pressure balance TBMs work?
    YouTube · Ingeoexpert
    Mar 16, 2022
    YouTube · Ingeoexpert
    2:30
    EPB TBMs use a screw conveyor to control spoil extraction, forming a plug to maintain pressure and support ground ahead of the face.
    Ingeoexpert
    YouTube·
    Mar 16, 2022

    How does Earth Pressure balance TBMs work?

    YouTube·Ingeoexpert·Mar 16, 2022
    YouTube
    In this video
    • 00:53
      Conditioning the spoil
    • 01:35
      Soil conditions
    • 01:51
      Limitations of EPB TBMs
    Robbins Earth Pressure Balance Machines (EPBs)
    YouTube · TheRobbinsCo
    May 30, 2017
    YouTube · TheRobbinsCo
    5:57
    Robins EPBs range from 3 to 14m in diameter, using a unique smooth flow spoke type cutter head & 2 liquids for backfilling.
    TheRobbinsCo
    YouTube·
    May 30, 2017

    Robbins Earth Pressure Balance Machines (EPBs)

    YouTube·TheRobbinsCo·May 30, 2017
    YouTube
    In this video
    • 00:58
      Cutting Tools
    • 01:32
      Adding additives
    • 01:51
      Excavation Process
    • 02:33
      Open Belt Conveyor
    • 03:09
      Shield Body
    • 03:22
      EPB Operation
    • 03:57
      Active Articulation
    • 04:35
      Tunnel Wall Support
    • 04:53
      Backfilling
    • 05:32
      Conclusion
    View all

    Web results

    What is a Slurry Tunnel Boring Machine?


    Trenchlesspedia
    https://trenchlesspedia.com › definition › slurry-tunnel-...
    Trenchlesspedia
    https://trenchlesspedia.com › definition › slurry-tunnel-...
    Oct 30, 2017 — A slurry tunnel boring machine (slurry TBM) is a type of underground excavator that removes excavated material by hydraulic means.Read more

    Slurry Balance Tunnel Boring Machine - NHI Global


    nhiglobalequip.com
    https://www.nhiglobalequip.com › product › slurry-bal...
    nhiglobalequip.com
    https://www.nhiglobalequip.com › product › slurry-bal...
    Slurry balance tunnel boring machine is well-suited for geological conditions featuring low groundwater pressure and high soil permeability.Read more

    Slurry TBM


    CREG TBM Germany GmbH
    https://www.creg-germany.com › slurry-tbm
    CREG TBM Germany GmbH
    https://www.creg-germany.com › slurry-tbm
    Slurry TBM provide face support by pressurizing slurry in excavation chamber to balance soil and water pressure on working face.Read more

    What are the advantages and disadvantages of slurry ...


    LANHI Equipment
    https://www.lanhiequipment.com › news
    LANHI Equipment
    https://www.lanhiequipment.com › news
    Apr 14, 2025 — ② Compared with hard rock tunnel boring machines (TBM), it has stronger adaptability in soft rocks and unstable strata. 2. Good control of ...Read more

    Tunnel boring machine


    Wikipedia
    https://en.wikipedia.org › wiki › Tunnel_boring_machine
    Wikipedia
    https://en.wikipedia.org › wiki › Tunnel_boring_machine
    The TBM known as Bertha, reportedly the largest earth pressure balance machine ... slurry is used to stabilize the tunnel face and transport spoil to the surface.Read more
  • History
  • 2000s
  • Types
  • Tunnel-face support methods

    • TBM – Tunnel Boring Machine


    Poclain Hydraulics
    https://poclain.com › Applications › Drilling & Mining
    Poclain Hydraulics
    https://poclain.com › Applications › Drilling & Mining
    Tunnel boring machines drill tunnels for underground structures. Poclain Hydraulics offers adapted solution for all type of machines, whatever their diameter.Read more

    How a tunnel boring machine works


    Lake Superior Community Partnership
    https://marquette.org › uploads › 2020/04 › Fact...
    Lake Superior Community Partnership
    https://marquette.org › uploads › 2020/04 › Fact...
    PDF
    Typically, the tunnel boring machine (TBM) operates with slurry pressures that are not significantly above water pressures. On those occasions when the slurry ...Read more
    4 pages

    TBM selection - EPB and Slurry - Civil Engineering | The Si-Eng


    si-eng.org
    https://www.si-eng.org › post › tbm-selection
    si-eng.org
    https://www.si-eng.org › post › tbm-selection
    Oct 25, 2021 — There are a wide variety of different types of TBM available in the market. Each of them is designed to tackle a specific type of ground conditions at maximum ...Read more
    Discussions and forums
    Bertha - world's largest earth pressure balance tunnel boring machine
    Reddit · 
    r/megalophobia
     · 80+ comments
     · 6 years ago
    Bertha - world's largest earth pressure balance tunnel boring machine
    Reddit · 
    r/megalophobia
     · 80+ comments
     · 6 years ago
    Bertha was designed and manufactured by Hitachi Zosen Sakai Works and is the world's largest earth pressure balance tunnel boring machine.  More
    world's largest earth pressure balance tunnel boring machine [1280 x 960] ...
    Reddit · 
    r/MachinePorn
     · 80+ comments
     · 6 years ago
    world's largest earth pressure balance tunnel boring machine [1280 x 960] ...
    Reddit · 
    r/MachinePorn
     · 80+ comments
     · 6 years ago
    Long story short, they were using this thing to dig a big tunnel under Seattle. It apparently wasn't really the right machine for the job, and it kept getting ...  More
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