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MAD 427
Tunnelling and Support Design
Lecturer: Prof. Dr.Bahtiyar ÜNVER
Subject: EPB and SLURRY types TBM
Janurary 2012
Emre KARACA
Hacettepe University
Department of Mining Engineering
Contact: [email protected]
Phone Number : 0535 851 59 29
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Outline
What is the TBM?
Types of TBM
EPB types TBM
Slurry types TBM
Conclusion
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
WHAT IS THE TBM?
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
WHAT IS THE TBM?
TBM (tunnel boring machine) is the
machine which use for the excavation of
tunnel, galery, underground openings in
metro, water, energy construction and
mining projects etc.
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Why We Use TBM?
When we use the TBM we gain ;
Time
Money
Comfort
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
TYPES OF TBM
TBM
Soft Rock
Slurry Epb
Hard Rock
Gripper
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
EPB (Earth PressureBalance)
Type TBM
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Working Area Condition EPB
Silt and clay (fine grained size)
Max 4 bar pressure (if over pressure
we can not use)
We do not want more water
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Advantages of EPB
Lower capital cost
Smaller site and launch
Muck is immediately ready for disposal
In case of face collapse amount of
ground loss is limited
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Disadvantages of EPB
Requires higher torque
Requires greater Cuttinghead power
Required confinement pressure must
be calculated
Muck is exposed into tunnel
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Slurry type TBM
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Working Area Conditions
Slurry
Sand and gravel
If we got more water income (slurry
condition )
We can use approxiametly more than
10 bar pressure ( i.e In Bosphorus 13
bar pressure)
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Advantages of Slurry
Lower torque
Lower Cuttinghead Power
Cleaner Tunnel Environment
Contaminated muck is not exposed
until it reaches the surface
Able to integrate rock crusher
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Disadvantages of Slurry
Requires a large size job site
Higher capital costs
Higher power requirement
Requires extensive addition of
material
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Applications in TURKEY
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
!!!ATTENTION!!!
We may see some problems at
operations. These are ;
Collapse
Swelling
Leakage of Additivies and Slurry
Wrong Selection Type of TBM
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Collapse
If the ground pressure higher than the
machine pressure. The result ;
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Swelling
If the ground pressure lower than the
machine pressure. The result ;
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Leakage of Additivies
If we don’t control the additives and
the slurry where they go. The result ;
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Wrong Selection of TBM
If we do not make a good analyse of
our ground and do not select the right
TBM. The result;
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
CONCLUSION
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
CONCLUSION
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
Have a Nice and Shorter
Vacation..
Before After
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
ANY QUESTIONS??
MAD 427 Tunnelling and Support Design Prep. by Emre KARACA
