The German Tunnelling Commitee has published new 'Recommendations for the selection of tunnel boring machines'.

The present recommendation shows on the basis of process-technical and geotechnical criteria the basis for the selection of tunnel boring machines for use in different types of ground (rock and soil). Existing interrelationships between the geotechnical, local and environmental boundary conditions as well as the process and machine technology are also taken into account. It thus represents an aid for project-specific analysis and decision-making for the selection of a suitable tunnel boring machine.

The full texts of all GTC recommendations are available for free download here.