Complex Logistical Constraints and their Technical Impact on A Deep Excavation Design, Ottawa, Ontario, Canada

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Abstract: The Kiewit Eurovia Vinci (KEV) Partnership are completing construction on the Confederation Line Extension (Ottawa Stage 2) LRT Project. The project includes up to 3.4 km of cut and cover tunnels within the urban center. Brierley Associates provided temporary support of excavation system designs for various segments of the open-cut trench excavation through soils and rock. This paper will focus on the Parkway Zone 12 and Zone 13a segments of the project where the open-cut trench extends up to 12 m below grade through glacial till, sands and clay. Due to complex logistical constraints for the segment of the open cut excavation, the designers and contractor collaborated and provided a unique design solution to meet the project needs. Logistical constraints for this segment included temporary and permanent ROW restrictions, accommodations for existing and proposed utilities (with several crossing the excavation at high skew angles), and traffic sequencing. The SOE system needed to account for stringent hydraulic cutoff requirements, utility crossings, limited bracing options due to tight ROW limits, and existing shallow foundation infrastructure adjacent to the excavation.

Anna Crockford; Mr. CHARLES LUXFORD

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