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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: karacaemr@gmail.com

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