The steep terrain on the South Fraser Perimeter Road required the largest quantity of MSE walls on a highway project in British Columbia – over 63,000 m2. Different proprietary systems were procured depending on the geography:
Typically, select granular quarried aggregate is used as backfill however the project team received over $1 million in savings by using Fraser River sand. The team performed triaxial tests to confirm the sand friction angle. The sand caused a slight increase in the MSE strap length and thus caused greater excavation however; the sand was much more cost effective and allowed for all-weather construction due to its porous nature.
Other cost savings were employed on the MSE walls including:
RAM Engineering Role
RAM was retained by the joint venture FTG Constructors to manage the MSE wall design, procurement, tendering and construction. A variety of subcontractors and self-perform crews were managed to build the different systems