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    AI Overview
    A Slurry Balance Tunnel Boring Machine (TBM) is a closed-face, pressurized excavator used for soft ground tunneling, particularly in high-water-table or non-cohesive soils (sand, gravel). It keeps the tunnel face stable by applying pressurized slurry (usually bentonite) to the excavation chamber, matching ground water pressure to prevent collapse and control settlement, with muck transported hydraulically to a treatment plant. 
    This video explains how the slurry pressure balance technique works:
    Related video thumbnail
    37s
    Tangxing Technology
    YouTube• Mar 30, 2023
    Key Aspects of Slurry TBMs 
    • Face Support: Pressurized bentonite slurry fills the cutter head chamber, supporting the tunnel face and creating a waterproofing membrane on the rock or soil surface.
    • Material Transportation: Excavated spoil is mixed with the slurry and pumped out through pipes, often allowing for continuous mining.
    • Separation System: A surface-based slurry treatment plant separates excavated spoil from the bentonite, allowing the slurry to be reused.
    • Ideal Application: Suited for unstable soil conditions with high water pressure and coarse ground, whereas Earth Pressure Balance (EPB) TBMs are often better for cohesive clays. 
    Components & Process 
    • Cutter Head: Rotates to loosen soil/rock, assisted by disc cutters or rippers.
    • Slurry Pump System: Supplies fresh slurry and removes muck, enabling precise, automated pressure control.
    • Slurry Treatment Plant: A multi-stage system (drums, shakers, hydrocyclones, filter presses) removes spoil from the suspension.
    • Face Monitoring: The pressure of the slurry is continuously monitored to match ground water pressure, preventing ground loss. 
    Slurry TBMs are essential for high-precision projects in urban areas where minimal surface deformation is critical. 
    • How does Earth Pressure balance TBMs work?
      Mar 16, 2022 — so earth pressure balance uh tbms. um are very common type of tbms. they're probably slightly more widely used than slurry tbms ma...
      2m
      YouTube·Ingeoexpert
    • Slurry TBM
      Jan 15, 2019 — During slurry TBM tunnelling, the working face stability is achieved by pressurized slurry in excavation chamber to balance soil a...
      3:48
      YouTube·CREGA
    • Slurry TBM | UGITEC
      Slurry TBM prevents tunnel face from collapsing by pressurized mud water in the cutter chamber. Excavated soil material is transpo...
      地中空間開発株式会社
    Show all
    • How does Earth Pressure balance TBMs work?
      Mar 16, 2022 — so earth pressure balance uh tbms. um are very common type of tbms. they're probably slightly more widely used than slurry tbms ma...
      2m
      YouTube·Ingeoexpert
    • Slurry TBM
      Jan 15, 2019 — During slurry TBM tunnelling, the working face stability is achieved by pressurized slurry in excavation chamber to balance soil a...
      3:48
      YouTube·CREGA
    • Slurry TBM | UGITEC
      Slurry TBM prevents tunnel face from collapsing by pressurized mud water in the cutter chamber. Excavated soil material is transpo...
      地中空間開発株式会社
    • 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
    • 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
    • The role of slurry TBM parameters on ground deformation
      Ó 2016 Published by Elsevier Ltd. * Introduction. Pressurized-face tunnel boring machines (TBM), such as slurry shield and earth p...
      Colorado School of Mines
    • Digging Deeper: Slurry Treatment Plant
      Jun 23, 2020 — so we're using a mixed shield tunnel boring machine on the tunneling phase of the project it's considered to be the Rolls-Royce of...
      2m
      YouTube·Metro Tunnel Project
    • Slurry TBM | TunnelPro
      A slurry-type TBM (tunnel boring machine) is designed for excavating non-cohesive terrains with a low percentage of silts and clay...
      TunnelPro
    • THIS IS HOW YOU BUILD TUNNELS - How does TBM(Tunnel ...
      May 27, 2024 — A TBM uses a rotating cutter head to cut rock, then a slurry pump transports the mud to prevent accumulation.
      1:08
      YouTube·Kingda Pump
    • Tunnel Boring Machines: How They Work
      Jul 28, 2025 — building such a long and deep tunnel requires incredible machines known as tunnel boring machines or TBMs. picture a giant metal w...
      1:02
      YouTube·The Impossible Build
    • What is TBM tunnel monitoring system?
      TBMs are widely used for efficient and precise excavation in various tunneling projects, such as subways, highways, and water conv...
      sisgeo.com
    • Solutions for Tunnel Boring Machines
      By using pressurized slurry to balance earth and water pressures at the tunnel face, they ( Slurry TBMs ) ensure enhanced controll...
      Sika Group
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    Web results

    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
    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
    Earth Pressure Balance (EPB) TBM
    YouTube · CREGA
    Jan 15, 2019
    YouTube · CREGA
    3:55
    CREGA
    YouTube·
    Jan 16, 2019

    Earth Pressure Balance (EPB) TBM

    YouTube·CREGA·Jan 16, 2019
    YouTube
    View all
    People also ask
    What is a slurry TBM?
    Slurry TBM provide face support by pressurizing slurry in excavation chamber to balance soil and water pressure on working face. The excavated muck is transported by a slurry circulation system. These machines are characterized by stabilizing working face in sandy to gravely ground with precise settlement control.

    Slurry TBM - CREG Germany


    CREG TBM Germany GmbH
    https://www.creg-germany.com › slurry-tbm
    CREG TBM Germany GmbH
    https://www.creg-germany.com › slurry-tbm
    What is the difference between slurry TBM and EPB TBM?
    In general, the slurry TBM supports the excavated face with a pressurised slurry as compared to an EPBM machine that relies more on a physical contact with the face and excavated material.

    Comparison of earth pressure balance and slurry tunnel boring machines ...


    Emerald Insight
    https://www.emerald.com › edited-volume › chapter › C...
    Emerald Insight
    https://www.emerald.com › edited-volume › chapter › C...
    What is the slurry pressure balance method?
    Slurry Pressure Balance

    The slurry generated and recycled by the tunnelling process is used to counterbalance earth and hydrostatic pressure at the face of the machine to provide immediate tunnel support. The technique is especially beneficial in ground consisting of a high water table.

    Microtunnelling Slurry - Rob Carr


    Rob Carr
    https://www.robcarr.com.au › offer-portfolio › microtun...
    Rob Carr
    https://www.robcarr.com.au › offer-portfolio › microtun...
    What are the disadvantages of using a TBM?
    The disadvantages are:
    • It is expensive.
    • Hard, abrasive rock causes problems for cutters.
    • It is difficult for the machines to cut through weathered, sheared, and highly jointed rock.
    • Actual tunneling time is reduced by frequent break-downs. A TBM is usually tunneling a maximum of 50% of the time.

    BORED TUNNELS


    sdsu.edu
    https://uon.sdsu.edu › ...
    sdsu.edu
    https://uon.sdsu.edu › ...

    Web results

    A Guide to Different Types of TBM and Where They Are Used


    nhiglobalequip.com
    https://www.nhiglobalequip.com › blog › a-guide-to-di...
    nhiglobalequip.com
    https://www.nhiglobalequip.com › blog › a-guide-to-di...
    Nov 17, 2025 — Hard rock TBMs are best suited for solid rock, while earth pressure balance and slurry TBMs excel in soft ground, making them popular in urban ...Read more

    Slurry TBM | UGITEC


    地中空間開発株式会社
    https://ugitec.co.jp › products › slurry
    地中空間開発株式会社
    https://ugitec.co.jp › products › slurry
    Slurry TBM prevents tunnel face from collapsing by pressurized mud water in the cutter chamber. Excavated soil material is transported in fluid slurry.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

    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

    TBM-DiGs-Slurry-TBM-Modeling-Mooney- ...


    Colorado School of Mines
    https://www.mines.edu › uploads › sites › 2018/07
    Colorado School of Mines
    https://www.mines.edu › uploads › sites › 2018/07
    PDF
    by M Mooney · 2015 · Cited by 89 — ABSTRACT: This paper examines the role of slurry TBM operational parameters, namely face, annulus and grout pressures, on ground deformation ...Read more
    11 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

    TBM Slurry and Spoil Solidification for Tunneling Projects


    MetaFLO Technologies
    https://www.metaflotech.com › Applications
    MetaFLO Technologies
    https://www.metaflotech.com › Applications
    Earth Pressure Balance Tunnel Boring Machines (EPB TBMs) are utilized in the construction of rail tunnels, metropolitan subway systems, highway tunnels, ...Read more

    TBM Design Considerations: Selection of Earth Pressure ...


    εεσυε
    https://www.eesye.gr › ΝΕΜΜΔΣ_r._lovat.pdf
    εεσυε
    https://www.eesye.gr › ΝΕΜΜΔΣ_r._lovat.pdf
    PDF
    by RP LOVAT · Cited by 29 — In order to make the decision on the selection of Earth Pressure Balance vs Slurry Pressure Balance we must consider all the selection criteria. Nothing can be ...Read more
    7 pages
    People also search for
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