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  Turin-Lion Railway Base Tunnel: TBM Excavation, Management and Underground Disposal of 300 M of Potentially Asbestos Ophiolite Hard Rock at the Eastern Portal

  An analysis of the difficult aspects related to tunnel excavation, management and underground disposal of asbestos-containing hard rock preserving health and safety requirements of personnel and environment is presented. The tunnel stretch containing the ophiolitic hard rock will be excavated by rock TBM operating in EPB mode. The TBM was modified for transferring the contaminated muck through the tunnel. The contaminated muck will be stored in special plastic containers that will be immediately sealed with concrete: The containers will be stored in abandoned stretches of tunnels that will have been previously waterproofed. Mortar is used to seal the space between containers and tunnel guaranteeing long-term stability conditions.

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