Keller completed the first large-scale polymer slurry drilled shaft project in Ontario utilizing a slurry tank farm.
Three 55-storey condominium buildings were to be built adjacent to a newly opened Toronto Transit Commission subway station. Vaughan, Ontario is known to experience underground water flow, as shown by a sinkhole that developed within 1 km of the project location.
The adjacent subway station was constructed using a slurry cut-off wall. Site geology exhibited a relatively high water table and a heterogeneous mix of soil conditions. The groundwater conditions, difficult soil layers, high loading conditions, and installation depths all made the local practice of caisson installation impractical. Quality control was a major factor to satisfy the geotechnical engineer’s Sonic Caliper testing.
To establish the proper drilling methodology, our Toronto office reached out through the Keller network to engage Case Foundation as a JV Partner. Case has extensive experience in drilling large shafts to the depths and size required on this project. Early in the project, Keller advised the client to perform an O-cell test to verify the design assumptions. The successful test verified our installation methodology and allowed the engineer to reduce the shaft diameter from 2 m to 1.676 m and to optimize caisson lengths. Keller installed drilled shafts under polymer slurry using a slurry tank farm.
Smart Centres and CentreCourt
Multiplex Construction Canada Ltd.
Keller Business Unit(s)
Keller Foundations Ltd.
McClymont and Rak