September/October 2023 - 91

FEATURE ARTICLE
OUTSTANDING PROJECT AWARD RUNNER UP
Partnering for Cutoff Wall Project Success
Project Design
The East St. Louis Deep Cutoff Wall
project is located in the area of East St.
Louis, Illinois, across the Mississippi
River from the city of St. Louis, Missouri,
along the left descending bank of the
river. The project is a fundamental part
of the U.S. Army Corps of Engineers'
(USACE) effort to rehabilitate and secure
the aging East St. Louis levee system that
provides flood protection to approximately
250,000 residents and more than
$4.5 billion in economic value.
The project was devised and designed
by USACE as a cutoff wall to be
installed in the Metro East Sanitary
District levee segment, one of the levee
segments that form the East St. Louis
system. The contract for the construction
of the cutoff wall was awarded in
November 2019 to Bauer Foundation, the
American subsidiary of the Bauer Group.
The design provided for the installation
of an approximately 4,440 ft
(1,350 m) long cutoff wall, with a
minimum 24 in (610 mm) thickness
and a maximum design depth of more
than 140 ft (43 m). The cutoff wall
extends through alluvial and outwash
soils, which include a highly permeable
gravel and cobbles layer, and is
embedded by a minimum of 2 ft (0.6 m)
in hard limestone with an unconfined
compressive strength up to 25,000 psi
(172,370 kPA). The wall was excavated
by the panel method, comprising
overlapping primary and secondary
panels, each no more than 30 ft (9 m) in
length. The maximum allowed vertical
deviation of each panel was 0.5% of its
full depth.
The cutoff wall was installed following
the single-phase process. This process
requires that a self-hardening
slurry be used as the excavation fluid.
Once panel excavation is complete, the
slurry is left in place to cure and thus
becomes the cutoff wall's final backfill
material. The slurry, designed by the
contractor, meets the following specified
stringent requirements: unconfined
compressive strength between 50-250
psi (345-1,725 kPA) and maximum
hydraulic conductivity of 1x10 cm/s.
Two 80 ft (24 m) long openings or
-6
" windows " were located along the cutoff
wall alignment. The windows were due
to the presence of vital underground
utilities, passing through the wall alignment.
One of the utilities serves the purpose
of flood control, while the other one
supplies water to the surrounding areas.
AUTHORS Matteo Bertoni, Amr Ragy and Osvaldo Valdez, Bauer Foundation, and Eric Piel, P.E., U.S. Army Corps of Engineers
DEEP FOUNDATIONS * SEPT/OCT 2023 * 91

September/October 2023

Table of Contents for the Digital Edition of September/October 2023

TOC
September/October 2023 - Intro
September/October 2023 - 1
September/October 2023 - 2
September/October 2023 - TOC
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