|
The New Austian Tunneling method (NATM) was developed between 1957 and 1965 in Austria. It was given its name in Salzburg in 1962 to distinguish it from old Austrian tunnelling approach. The main contributors to the development of NATM were Ladislaus von Rabcewicz, Leopold Müller, and Franz Pacher.
The NATM is an approach of philosophy integrating the principles of the behaviour of rock masses under load and monitoring the performance of underground construction during construction. The fact is that the NATM is not a set of specific excavation and support techniques.
Müller listed 22 principles of NATM. There are seven most important features on which is NATM based:
- Mobilisation of the strength of rock mass
- Shotcrete Protection
- Measurements
- Flexible support
- Closing of invert
- Contractual arangements
- Rock mass classification determines support measures
|
