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A Dual-Mode TBM (Tunnel Boring Machine) is a hybrid system designed for highly variable ground, combining a Single-Shield/Hard Rock TBM with an Earth Pressure Balance (EPB) shield. It enables efficient, continuous excavation in mixed geology—switching between hard rock (using grippers) and soft soil (using face pressure) without needing to switch machines.
This video provides a glimpse into the operation of a dual-mode TBM:
Key Operating Modes
- EPB Mode (Soft Ground/Unstable): Used in soft soil, sandy gravels, or fractured rock. The machine maintains active pressure on the tunnel face to prevent collapse, using a screw conveyor to remove muck.
- Single-Shield/Open Mode (Hard Rock/Stable): Used in competent, stable rock. The TBM uses grippers to brace against the tunnel walls, allowing for faster, uninterrupted boring.
Key Benefits
- Versatility: Ideal for projects with changing, non-homogeneous, or unknown geotechnical conditions.
- Safety: Provides high-density support and protection (segment lining) in both weak and hard ground conditions.
- High Performance: Combines the continuous operation of hard rock machines with the stability control of soft-ground machines.
Common Applications
Dual-mode TBMs, often referred to as "[Crossover" or "Hybrid" machines, are used for long tunnels where geology shifts between high-strength rock and soil/water-bearing formations.
Do you need more specific information?
- Specific geology? (e.g., hard rock, soft soil, or a mix)
- Specific, existing tunnel projects that used a dual-mode TBM?
- Comparison between Dual-Mode and Triple-Mode TBMs?
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Web results
Dual Mode
TunnelPro
https://tunnelpro.it › dual-mode
TunnelPro
https://tunnelpro.it › dual-mode
A Dual Mode TBM provides active support for the excavation face in soft soil formations and can therefore be used in EPB mode. Alternatively, it can be utilized ...Read more
Dual Mode, “Crossover” Type Tunnel Boring Machines
The Robbins Company
https://www.robbinstbm.com › uploads › 2014/08
The Robbins Company
https://www.robbinstbm.com › uploads › 2014/08
PDF
This paper will explore modern trends in mixed ground TBM tunnelling, including Crossover EPB/Rock Designs that could be applied to the weak/soft rock so often.Read more
Double Shield TBM
Herrenknecht AG
https://www.herrenknecht.com › products › productdetail
Herrenknecht AG
https://www.herrenknecht.com › products › productdetail
Continuous tunnelling at maximum speed: the Double Shield TBM combines the functional principles of Gripper TBM and Single Shield TBM.
What is a dual-mode TBM? Types, technical features, and ...
LANHI Equipment
https://www.lanhiequipment.com › news
LANHI Equipment
https://www.lanhiequipment.com › news
Aug 26, 2025 — Dual-mode tunnel boring machines break through geological barriers through technological integration. Their flexibility, intelligence, and high ...Read more
Dual Mode Tunnel Boring Machine - NHI Global
nhiglobalequip.com
https://www.nhiglobalequip.com › product › dual-mod...
nhiglobalequip.com
https://www.nhiglobalequip.com › product › dual-mod...
Dual mode tunnel boring machine is used for tunneling work over long distances where ground conditions vary greatly. It can switch modes based on the ...Read more
Web results
CN102410027B - Dual-mode TBM (tunnel boring machine) ...
Google Patents
https://patents.google.com › patent
Google Patents
https://patents.google.com › patent
The invention discloses a novel dual-mode TBM (tunnel boring machine) and a control method thereof used for the field of tunnel shield and TBM construction.Read more
Tunnel Boring Machines
Kawasaki Heavy Industries, Ltd.
https://global.kawasaki.com › industries › Tunnel...
Kawasaki Heavy Industries, Ltd.
https://global.kawasaki.com › industries › Tunnel...
PDF
Kawasaki has developed dual-mode earth pressure shield machines by augmenting mechanisms that efficiently excavate and remove hard soil. Such superior functions ...Read more
Selection Method and Application of Dual‐Mode TBM in ...
Wiley Online Library
https://onlinelibrary.wiley.com › doi › adce
Wiley Online Library
https://onlinelibrary.wiley.com › doi › adce
Apr 9, 2025 — The strata that are suitable for an EBP TBM usually have particle sizes smaller than 1.5 mm. The particle size of the strata suitable for ...Read more
Dual Mode, “Crossover” Type Tunnel Boring Machines
The Robbins Company
https://www.robbinstbm.com › crossover-tbms-atc
The Robbins Company
https://www.robbinstbm.com › crossover-tbms-atc
May 20, 2015 — This paper will explore modern trends in mixed ground TBM tunnelling, including Crossover EPB/Rock Designs that could be applied to the weak/soft rock.Read more
Scholarly articles for Dual-Mode TBM | |
… on tunnelling performance of dual-mode shield TBM … - Wu - Cited by 18 Predicting model of dual-mode shield tunneling … - Yang - Cited by 20 | |