[PDF] The significance of weakness zones in rock tunnelling

The significance of weakness zones in rock tunnelling

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.

An Overview of Design and Construction practices of Himalayan

Major differences between the two methods of tunnelling. New Austrian Tunnelling Method (NATM). Norwegian Method of Tunnelling (NMT). • Suitable for weak rocks 

The significance of weakness zones in rock tunnelling

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.

ROCK SUPPORT IN NORWEGIAN TUNNELLING

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 significance of weakness zones in rock tunnelling

Using the Q-system

The development of the NGI Q-system for rock mass classification began in the early based on 1050 examples mainly from Norwegian underground excavations ...

Strait Crossings 2013 16. – 19. June Bergen

http://www.rockmass.net/ap/88_Nilsen&Palmstrom_on_Challenging_subsea_tunnels.pdf

ROCK MASS CLASSIFICATION – A CRITICAL EVALUATION OF

1.1 About classification systems and tunnelling methods. Describing rock masses and ground weakness zones and for temporary support (in Norwegian).

Engineering geology and rock engineering applied in the design of

Most Norwegian tunnels have been excavated by the drill and blast method generally at an For example tunnelling in poor rock mass conditions

A Case Study of Cavity Formation and its Rectification Works in

underground tunnels because of the rock properties and various factors of Application of Norwegian Method of Tunnelling (NMT) in Weak Rocks in Western ...

Excavating in weak rocks with the Norwegian Method of

construction of the first tunnel project in Patras Greece using principles from the Norwegian Method of Tunnelling (NMT) This project comprises the construction of a bypass highway with twin tunnels scheduled to open by year 2001 in weak marl formation with sandy interbeddings The twin tunnels with an approximate length of 650 m have a

THE NORWEGIAN METHOD OF TUNNELING - Colorado School of Mines

the Norwegian Method of Tunneling (NMT) which includes the use of: (1) “design as you go” procedure (2) “wet and flexible” construction and (3) “expect the unexpected” flexible contracting system A background is provided in the development of NMT and how it evolved in the light of different large Norwegian underground construction projects