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  Cover grouting through unconsolidated 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 is located 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. To assist with excavation through the unconsolidated materials, and in particular a loose, water bearing pumice layer within the debris, a cover/consolidation grouting program was carried out.

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