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NEW AUSTRIAN TUNNELING METHOD

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BY ADIL BIN AYOUB .

Published in: Engineering

NEW AUSTRIAN TUNNELING METHOD

  1. 1. NATM NATM NEW AUSTRIAN TUNNELING METHOD By ADIL BIN AYOUB 41-CE-13 B.Tech CIVIL ENGINEERING School of Engineering & Technology, BGSBU Rajouri J&K
  2. 2. CONTENTS 1. HISTORY OF NATM 2. DEFINITION OF NATM 3. BROAD PRINCIPLES OF NATM 4. SUMMARY OF THE PROCEDURE IN NATM 5. SEQUENCE OF EXECUTION OF NATM 6. CONCEPT OF 3D MONITERING 7. CONCLUSION
  3. 3. HISTORYOF NATM  The term New Austrian Tunneling Method Popularly Known as NATM got its name from Salzburg (Austria).  It was first used by Mr. Rabcewicz in 1962. It got world wise recognition in1964.  The first use of NATM in soft ground tunnel in Frankfurt (Europe) metro in 1969.
  4. 4. DEFINITION OF NATM  The New Austrian Tunneling Method is a support method to stabilize the tunnel perimeter by means of sprayed concrete ,anchors and other support and uses monitoring too control stability.  Main idea is to use the geological stress of the surrounding rock mass to stabilize the tunnel itself
  5. 5. BROAD PRINCIPLES OF NATM  Mobilization of the strength of rock mass  Shotcrete protection  Measurements and monitoring  Primary Lining  Closing of invert  Rock mass classification
  6. 6. MOBILIZATION OFSTRENGTH OF ROCK MASS
  7. 7. SHOTCRETE PROTECTION
  8. 8. MEASUREMENTSAND MONITORING
  9. 9. PRIMARY LINING Wire mesh and steel ribs
  10. 10. CLOSING OF INVERT
  11. 11. ROCK MASS CLASSIFICATION
  12. 12. WHY NATM  Flexibility to adopt different excavation geometries and very large cross sections.  Flexibility to install additional support measures, rock bolts, dowels, steel ribs if required.  Easy to install a waterproof membrane.  Easy to install primary support, i.e. shotcrete.
  13. 13. SUMMARY OFTHE PROCEDURE IN NATM  SHOTCRETING AT THE EXCAVATED AREA(PRIMARY LINING)  PLACING OF THE WIREMESH ALONG THE FACEOF THE TUNNEL  ERECTION OF THE LATTICE GIRDER ALONG THE FACE OF THE TUNNEL  PERTICULAR TYPE OF ROCKBOLTING  SHOTCRETING THE WHOLE ARRENGEMENT(SECONDARY LINING)
  14. 14. CONCEPT OF 3D MONITORING  3D MONITORING IS NEW TECHNIQUE USING FOR TAKING THE RIGHT ALIGNMENT OF THE TUNNEL  OPTICAL TARGETS ARE USED FOR DETRMINIG THE COORDINATES FOR MEASUREMENTS  THE COORDINATES SHOULD BE CHECKED DAILY  IT IS NECESSARY FOR THE TUNNEL AS BY IT WE KNOW ANY DISPLACEMENT AND WRONG ALIGNMENTS
  15. 15. General Optical Target
  16. 16. WHERE NATM IS USING IN INDIA  PRESENTLY IT IS USING WIDLELY IN KASHMIR RAILWAY PROJECT  THEY ARE USING IT IN THEIR TUNNELS LIKE IN PIR PANJAL TUNNEL , T-74R, T- 48 ETC
  17. 17. NATM approach of design and execution of the tunneling in soft ground is advantageous and scientific way in comparision to the old way of tunneling. This system monitors rock mass deformation and design the support system with reference to the rock mass type . CONCLUSION
  18. 18. THANK YOU FOR YOUR ATTENTION! THANK YOU FOR YOUR ATTENTION

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