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. 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 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 MAD 427 Tunnelling and Support Design Prep by Emre KARACA Hard Rock Epb Gripper 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 bar pressure (if over pressure we can not use) We 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 not make a good analyse of our ground and 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 MAD 427 Tunnelling and Support Design Prep by Emre KARACA After ANY QUESTIONS?? MAD 427 Tunnelling and Support Design Prep by Emre KARACA ... 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... 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... 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