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be higher than the groundwater to avoid sediment infiltra-tion.
If needed, we put more water into the shaft so it stays
above the existing water level.”
With the high water table, “water management is key,”
Marcoux said. Water quality in the shaft is tested for such
contaminants as suspended sediments, heavy metals and
hydrocarbons. Any water discharged into the local sewer
system must meet quality standards set by the City of
Montreal. In cases where the water is not compliant, it is
extracted with a vacuum truck and transported to an appro-priate
alternate site for discharge.
Another important success was a design optimization that
allowed for a reduction of shaft length from 30 to 14 metres by
using the friction of the soil instead of the end bearing capac-ity
of the rock. Typically a metallic shaft is drilled and sealed
to the bedrock; a socket is then drilled into the bedrock, and
a reinforcement cage is installed into the shaft. Concrete is
then poured into the reinforced shaft.
The socket makes it possible to mobilize the lateral capac-ities
of the bedrock and thus resist to forces by friction, which
has proven to be a very efficient solution to ensure high
stability and resistance considering the challenging geotech-nical
and stratigraphic conditions of the site, with its layers of
sand, gravel, silt, clay, backfill and organic soil over bedrock.
Requiring surgical precision and military-style planning
on a gigantic scale, the Turcot Project is a valuable model
for other projects to upgrade transportation infrastructure
across Canada.
PROJECT SPOTLIGHT
Ongoing since 2015, it is a
massive operation taking
place on four sites at once.
56 Q2 2018 www.pilingcanada.ca
