January/February 2023 - 74

brought in Dr. Sauer and Partners, a
tunnelling consulting group based out
of Salzburg, Austria, to provide the
temporary mining support design
underneath the subway box that
provided structural underpinning
support installation. The initial
excavation below the subway line took
place in six galleries perpendicular to
the existing subway boxes. The
galleries were designed with shotcrete
facing and temporarily supported the
subway box above with vertical props.
When a gallery was completed, needle
beams were installed through the
galleries and connected to the plate
girders on either side of the subway
line. The props were then removed.
Mining gallery construction was
completed by HC Matcon.
During the design phase, it was
decided to use the shoring system to
support the suspended subway box
during the underpinning phase to
reduce the number of support caissons
required, which would impact the
future excavation works and future
train testing inside Cedarvale Station.
This design change resulted in significant
additional load 2,050 kN
Live traffic over the job site
(460 kips) being carried through the
secant pile wall on each side of the
existing subway box. The structural
plate girders were supported by a
recessed connection in the secant pile
wall on the south side and structural
columns on the north. Jacks were set
up on each needle beam and the plate
girders to allow adjustments to
accommodate movement of the
support system during excavation.
The support of excavation under the
subway adjacent to the underpinning
mining galleries was particularly
challenging because of very limited
space for equipment due to the 2.4 m
(8 ft) mining gallery height and 4 m
(13 ft) gallery width, further congested
Preloading of the walers
74 * DEEP FOUNDATIONS * JAN/FEB 2023

January/February 2023

Table of Contents for the Digital Edition of January/February 2023

TOC
January/February 2023 - Intro
January/February 2023 - 1
January/February 2023 - 2
January/February 2023 - TOC
January/February 2023 - 4
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