PROJECT
Keller Project Solutions: Chaplin Station in Toronto The solution Grouting would stabilize the soil around two drilled shafts without causing excessive movement or soil fracturing. A cementitious grout mix was injected via multiple port sleeve pipes under high pressure from the underside of the shafts to approximately 9.8 feet (three metres) below the underside of the shaft. A total of 244 cubic feet (6.9 cubic metres) of grout were injected at eight grouting locations with five grouting ports per location. Keller evaluated grout takes, pressures and movement monitoring to determine if further grouting was required, but the initial preventative grouting program proved successful in stabilizing the shafts
When unexpected movement and
severe sand caving and disturbances.
ground disturbance occurred following
The general contractor proposed a
drilled shaft installation, Keller
preventative grouting program to ensure
Project facts
performed preventative grouting to keep
that the adjacent shafts, critical to project
Owner(s): Metrolinx
the project on track.
completion, were founded on adequate
• Keller business unit(s): Keller
soils with appropriate bearing capacity.
• Main contractor(s): Crosslinx Transit
Chaplin is a new underground station
The challenge
• Engineer(s): Thurber Engineering Ltd.
for the Eglinton Crosstown LRT, part of
The owner set a strict project schedule,
• Solutions: Underpinning
the Toronto subway system. As others
and grouting had to be done within a
• Markets: Infrastructure, Railway
installed drilled shafts, unexpected
tight window to get the project back on
• Techniques: High mobility (cement
soil conditions on one shaft led to
track.
slurry) grouting l
The project
and allowing construction to continue.
Solutions Contractors
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