NEW AUSTRIAN TUNNELING METHOD
ADIL BIN AYOUB
School of Engineering & Technology, BGSBU
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
The term New Austrian Tunneling Method
Popularly Known as NATM got its name from
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
Measurements and monitoring
Closing of invert
Rock mass classification
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
SHOTCRETING AT THE EXCAVATED AREA(PRIMARY
PLACING OF THE WIREMESH ALONG THE FACEOF
ERECTION OF THE LATTICE GIRDER ALONG THE
FACE OF THE TUNNEL
PERTICULAR TYPE OF ROCKBOLTING
SHOTCRETING THE WHOLE
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
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-
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 .
THANK YOU FOR YOUR ATTENTION!
THANK YOU FOR YOUR ATTENTION