NEW AUSTRIAN TUNNELING METHOD

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

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

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.

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

BROAD PRINCIPLES OF NATM
 Mobilization of the strength of rock mass
 Shotcrete protection
 Measurements and monitoring
 Primary Lining
 Closing of invert
 Rock mass classification

MOBILIZATION OFSTRENGTH OF
ROCK MASS

PRIMARY LINING
Wire mesh and steel ribs

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.

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)

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

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

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

THANK YOU FOR YOUR ATTENTION!
THANK YOU FOR YOUR ATTENTION

NEW AUSTRIAN TUNNELING METHOD

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