Design and Construction Considerations for the Pawtucket CSO Tunnel

Synopsis:

The Pawtucket Tunnel is a 2.2-mi, 30.2-ft diameter CSO storage tunnel in Rhode Island. The primary tunnel is built using a dual-mode open-EPB TBM capable of sealing the face within 120 seconds to manage poor ground and water ingress which is launched from within a SEM starter tunnel. The main tunnel connects to four adits along its alignment, three of which are SEM tunnels and one being a MTBM tunnel. This contribution describes the selection process, potential risks, and requirements for the TBM, as well as the design of the main tunnel, the adits, and the adit-bored tunnel connections.

2023 Rapid Excavation & Tunneling Conference Proceedings
June 11-14, 2023, Boston, MA (Kelly, K., Despointes, V., Polycarpe, S., Gall, V.E., Feeney, C. & Hann, B.)
Copyright holds Society for Mining, Metallurgy & Exploration (SME). Full proceedings volumes can be found on website at www.smenet.org.