Whitby Toyota: Commercial Building Addition, Ontario

The Whitby Toyota project involves the construction of an addition to an existing commercial building located at 1025 Dundas Street West in Whitby, Ontario. Menard was contracted by Fluid Construction to install Controlled Modulus Columns (CMCs) beneath the structure’s foundations to increase bearing capacity and minimize settlement.

Soils encountered on site consisted of 1.5 m of gravel fill, underlain by silty sand and sandy silt.

• The loose to compact overlying fill and the soft till layer required ground improvement to achieve the required bearing capacity and reduce settlement.
• The groundwater table was located approximately 2.5 m below existing grade.

Controlled Modulus Columns (CMCs) were selected to provide the required bearing capacity and settlement control for the foundations of the proposed structure. Using 0.25 m diameter CMCs, a bearing capacity of 250 kPa SLS/375 kPa ULS was achieved. The CMCs also limit total settlement to less than 25 mm and differential settlement to less than 19 mm between adjacent footings. The displacement auger used to install the CMCs minimizes excess soil generation.

Installation with a displacement auger minimized excess soil generation.