Excavating in weak rocks with the Norwegian Method of Tunnelling (NMT) P Chryssanthakis Norwegian Geotechnical Institute, Oslo Norway N Barton and F
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ROCK EXCAVATION AND SUPPORT TECHNIQUES by: All Norwegian subsea tunnels have been exca- tions as well as the conditions of possible weak-
Palmstrom&Naas on Norwegian subsea tunnelling
Most Norwegian tunnels have been excavated by the drill and blast method generally at an For example, tunnelling in poor rock mass conditions, where
Palmstrom on Engineering geology in Norway
methods of excavation Over the past two decades, several new tunnels have since been constructed in Norway in relatively weak and poor rock conditions
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darker blue colour is tunnels for rail way construction, this had a rather uneven use for many years, poor quality rock mass of weakness zones has velocities
Publication
Publication No 1 - “Norwegian Hard Rock Tunnelling” issued 32 years ago may 3 Pre-construction investigation methods 22 strong or weak, and sometimes even soil condition
Publication
Long journey times associated with the Norwegian railway is one of the main factors spalling in massive brittle basement rocks, 2) tunnel squeezing in weak conventional excavation methods, estimated construction time for one tunnel
Norwegian Method of Tunnelling Marek Cała usually necessary to provide support in hard rocks", Norwegian tunnels require more rock TBM's are the most usual methods of excavation weak ground commonly associated with NATM)
NMT
the freedom to choose the best excavation and rock support method Some examples of methods used in Norway for tunnelling through weakness zones of very.
Major differences between the two methods of tunnelling. New Austrian Tunnelling Method (NATM). Norwegian Method of Tunnelling (NMT). • Suitable for weak rocks
the freedom to choose the best excavation and rock support method Some examples of methods used in Norway for tunnelling through weakness zones of very.
excavation. The basic approach to rock support in Norwegian tunnelling is to utilise the inher- to give an accurate picture of any weak rock zones that.
The development of the NGI Q-system for rock mass classification began in the early based on 1050 examples mainly from Norwegian underground excavations ...
http://www.rockmass.net/ap/88_Nilsen&Palmstrom_on_Challenging_subsea_tunnels.pdf
1.1 About classification systems and tunnelling methods. Describing rock masses and ground weakness zones and for temporary support (in Norwegian).
Most Norwegian tunnels have been excavated by the drill and blast method generally at an For example tunnelling in poor rock mass conditions
underground tunnels because of the rock properties and various factors of Application of Norwegian Method of Tunnelling (NMT) in Weak Rocks in Western ...
The significance of weakness zones in rock tunnelling