September/October 2023 - 94

A few vertical columns were installed to the sides of
one of the utilities as an alternative to cutoff wall panels
utilities as an alternative to cutoff wall
panels. Due to the presence of other
utilities that ran across the cutoff wall
alignment and that could neither be
relocated nor interrupted, the installation
of panels was not feasible in
those locations.
The contractor ran a pump test at
each window before the installation of
the jet grout curtain took place. During
the pump test, water flow and piezometric
levels at several nearby piezometers
were recorded documenting
the hydraulic conditions prior to installation
of the curtain. At each window,
the collected data provided a baseline
that was used later to compare to the data
recorded after completion of the curtain.
Additional Cutoff Wall Panels
and Jet Grout Columns
The contractor decided to make no
changes to the cutoff wall installation
procedure, given the excellent results
previously achieved, and to install the
jet grout columns using the single fluid
method. The additional cutoff wall
panels were installed using the same
rigs and batch plant as utilized before.
For the installation of the jet grout
columns the team mobilized a Klemm
KR 720 drill rig and a smaller batch
plant that included high-pressure
Additional COW
and jet grouting columns design
The specification required that the
jet grout curtain be a minimum 30 in
(760 mm) wide. In order to confirm the
continuity and minimum thickness of
the curtain continuity, all columns
were surveyed for verticality.
The limited information regarding
the exact location and structural
conditions of one of the two utilities
required that preventative measures be
set in place prior to the commencement
of construction operations. The contractor,
in collaboration with USACE,
determined that it was vital to first
locate the utility and then devise a
system to monitor it for potential
movement during construction. The
solution envisioned by the project team
provided for probing of the utility from
the bottom of cased drilled shafts. After
the probing was completed, a movement
monitoring system designed by the
contractor was installed inside the
shafts, which were then backfilled with
self-hardening slurry.
94 * DEEP FOUNDATIONS * SEPT/OCT 2023
Cased drilled shaft for utility location at a window

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
September/October 2023 - 4
September/October 2023 - 5
September/October 2023 - 6
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