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  Tunnelling through recent volcanic deposits at the Upper Lillooet Hydro Electric Project, Pemberton, BC, Canada

  The Upper Lillooet River Hydroelectric Project, an 81.4 MW run-of-river, hydropower project in Southeastern British Columbia, Canada. The project involved the excavation of a 6 m wide x 5.5 m high, approximately 2500 m long tunnel along the Upper Lillooet Valley, adjacent to the Mount Meager Volcanic Complex, the most recently active volcano in Western Canada. Tunnelling conditions were anticipated to be very challenging – through deposits associated with the most recent eruption (2360 yrs. B.P.) from Mt. Meager beginning in welded breccia, through unconsolidated deposits, and into the underlying tonalite bedrock. Following the completion of cover grouting activities, umbrella support was installed, and excavation was completed by a combination of roadheader, hammer, and drill and blast.

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