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Rock Tunnelling | WSP

Rock tunnelling is a specialty that is incorporated across all of our market sectors, including transportation, roads and highways, rail and transit systems, underground stations, water and waste water conveyance, power and energy, and underground storage facilities, including petroleum and nuclear waste repositories.

TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND …

TUNNELLING IN ROCKS – PRESENT TECHNOLOGY AND FUTURE CHALLENGES ZHAO Jian Professor of Rock Mechanics and Tunnelling Swiss Federal Institute of Technology (EPFL) Lausanne, Switzerland Inaugural Lecture, EPFL 24 May 2007 Laboratoire de Mécanique des Roches −LMR

Tunnelling in overstressed rock - rocscience.com

The rock mass surrounding a tunnel can be over-stressed when either the intact rock or the disconti-nuities fail as a result of the stresses induced by the ... Tunnelling in overstressed rock E. Hoek Evert Hoek Consulting Engineer Inc., Vancouver, Canada P.G. Marinos

Appendix 2.2 Tunnel Construction Methods

2.3 Bored Tunnelling Bored tunnelling by using a Tunnel Boring Machine (TBM) is often used for excavating long tunnels. An effective TMB method requires the selection of appropriate equipment for different rock mass and geological conditions. The TBM may be suitable for excavating tunnels which contain competent rocks that

Tunnel - Wikipedia

Norwegian Tunnelling Network (NTN) NTN is a business network established by members of the Norwegian Tunnelling Society (NFF), the professional association of the rock blasting and tunnelling industry of Norway.

Tunnel boring machine - Wikipedia

Table 1: Evaluation of the Influence of Tunnelling Hazards in the TBM-type Selection Tunnelling Hazards TBM TYPE OPEN SINGLE SHIELDED DOUBLE SHIELDED Abrasive/Hard rock 000 0 00 Rockfall, rock wedge instability (overbreak) 0 00 00 Caving ground 0 00 00 Water inrush 000 00 00

Norwegian Tunnelling

In Scandinavian hard rock conditions, most tunnels are excavated by drill & blast technique (at Triangeln Station in Sweden, for example, or in the refurbishment of Päijänne Water Tunnel, Finland). In softer rock, other excavation methods such as road headers is an alternative...

Tunnelling in Difficult Ground: How the Geotechnical ...

Tunnelling in Weak Rock – Sequential Excavation 2 of 38 Tunnelling Grad Class (2014) Dr. Erik Eberhardt Ground Reaction - Convergence A key principle in underground construction involving weak rock is the recognition that the main component of tunnel support is the strength of the rock mass and that it can be mobilized by minimizing