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Unit No. 3
Tunneling
Tunnel Boring Machine
Sanjivani Rural Education Society’s
Sanjivani College of Engineering, Kopargaon-423603
(An Autonomous Institute affiliated to sppu, pune)
Department of Structural Engineering
PROF. GUNJAL SACHIN M
ASSISTANT PROFESSOR, STRUCTURAL ENGINEERING
DEPARTMENT
Tunnel Boring Machine (TBM)
• Tunnel Boring Machine (TBM) also known as ‘MOLE’.
• It is used to excavate tunnels with a circular cross
section.
• It can bore through anything from hard rock to sand.
• Different types of TBMs are used for different
geotechnology.
• Used as an alternative to drilling and blasting (D&B)
methods and conventional 'hand mining' in soil
• Limits the disturbance to the surrounding ground and
produces a smooth tunnel wall.
• Suitable to use in heavily urbanized areas.
Tunnel Boring Machine (TBM)
• Before the advent of TBM the drilling and
blasting was the only economical way of
excavating long tunnels through hard rock,
where digging is not possible.
• Even today, the method is still used in the
construction of tunnels, but the
disadvantage is it disturbance the
surroundings.
Advantages
• Higher advance rate
• Continuous operations
• Less rock damage
• Less support requirements
• Greater work safety
• Automated operations
Disadvantages
• TBMs are expensive to construct and can
be difficult to transport.
• TBM can not move in backward direction
• Difficult to transport.

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Tunnel Boring Machine.ppt

  • 1. Unit No. 3 Tunneling Tunnel Boring Machine Sanjivani Rural Education Society’s Sanjivani College of Engineering, Kopargaon-423603 (An Autonomous Institute affiliated to sppu, pune) Department of Structural Engineering PROF. GUNJAL SACHIN M ASSISTANT PROFESSOR, STRUCTURAL ENGINEERING DEPARTMENT
  • 2. Tunnel Boring Machine (TBM) • Tunnel Boring Machine (TBM) also known as ‘MOLE’. • It is used to excavate tunnels with a circular cross section. • It can bore through anything from hard rock to sand. • Different types of TBMs are used for different geotechnology. • Used as an alternative to drilling and blasting (D&B) methods and conventional 'hand mining' in soil • Limits the disturbance to the surrounding ground and produces a smooth tunnel wall. • Suitable to use in heavily urbanized areas.
  • 3. Tunnel Boring Machine (TBM) • Before the advent of TBM the drilling and blasting was the only economical way of excavating long tunnels through hard rock, where digging is not possible. • Even today, the method is still used in the construction of tunnels, but the disadvantage is it disturbance the surroundings.
  • 4.
  • 5. Advantages • Higher advance rate • Continuous operations • Less rock damage • Less support requirements • Greater work safety • Automated operations
  • 6. Disadvantages • TBMs are expensive to construct and can be difficult to transport. • TBM can not move in backward direction • Difficult to transport.