Controlled Modulus Columns (CMCs)
475 Under Each Tanks Footprint
Trans Mountain Pipeline L.P. was expanding its existing pipeline system from Edmonton, Alberta, to Vancouver, BC, to increase the carrying capacity of light & heavy crude oils and refined products. WorleyCord LP (CORD) had been contracted to provide engineering, procurement, and construction (EPC) services for some of the facilities between Edmonton, Alberta, and Hope, BC. The engineer recommended soil mixing to improve the soft clay underneath, but Menard proposed to design and construct Controlled Modulus Columns (CMC) under the future tank (Tank 3 and Tank 4 of the Edmonton Terminal) foundation to increase the bearing capacity of the soil and limit the overall settlement of the tanks. CMCs have proven to be economical, less time-consuming, and limited vibration with nominal/no spoil generated during project execution.
The general subsurface stratigraphy consisted of:
• Loose Clay fill in the top 4m;
• Firm Clay till for the next 8m;
• Compacted Sandy material;
• Clay Shale making up the bedrock beneath