Presentation by Cristóvão, LC13D

1. Instituto Superior de Engenharia de Lisboa
Departamento de Engenharia Civil
Disciplina de Inglês
Tunneling Construction
New Austrian Tunneling
Method - NATM
Cristóvão Andrade Nº 38644

2. New Austrian Tunneling Method –NATM
Method Origin:
• New Austrian Tunneling Method- Created betwen 1957 and
1965;
• Austrian origin;
• Developed by Muller, Rabcewicz and Pache.
Propertys:
• Tunnel auto-sustention;
• Aplication of a shotcrete layer;
• Monotorization of the tunnel state.

3. New Austrian Tunneling Method - NATM
Constructive Method:
- Creation of a first suport on the surface of the tunnel
opening (loosenig zone) to avoid deterioration;
- Opening of a tunnel traject not very long ;
- Projection of concrete in all the circular perimetre of the
excaved zone (25 at 50 mm);
- Introduction of metalics suports (cambots);
- Fixation of the sustention reinforcement (usualy 6mm);
- First hand of shotcrete, in a layer with thickness not
superior at 150 mm;
- Perfuration of the formed layer for the inserection of the
anchorages;
- Introduction of the suport for the next excavation cicle.

4. New Austrian Tunneling Method - NATM

5. New Austrian Tunneling Method - NATM
Legend Objective of the control Instrument
1 Deformation of the Convergence tape
excavation surface. Surveying marks
2 Deformation of the Strainsters
pavement of the tunnel
envelope.
3 Monitorization of the Anchorage force
pavemente suport, of the
anchorage element.
4 Monitorization of the Embedments gauge
pavimente suport referent Preasure Cells
at concrete layer.

6. New Austrian Tunneling Method – NATM
Case of Study – Frankfurt Subway
• NATM method it was apllied at 55 - 70 % of the excavation
process;
• Joining the utilization of a tunneling machine roadheader to
execute the process, it was possible spent 20% of the time of
execution in relation at the use of any other kind of it;
• This utilization alows get specifics operations of NATM
method, like the terrains suport – in this case, it was not with
shotcrete in the tunnel walls, but with the inserection of steel
archs like temporarly suports.

7. New Austrian Tunneling Method - NATM
Bibliography/ Reference:
• Tatiya, Ratan. “Civil excavations and tunneling: a pratical
guide.”, Bristol, 2005.