May/June 2024 - 106

located. As a proactive measure, the
project team installed new weep hole
drains along the bottom of the O'Hara
wall that would be integrated into the
permanent foundation drain. As a note,
the primary water troubles encountered
during construction were due to the
large, exposed drainage area and runoff.
In the permanent condition, the entire
hillside would be under roof, and a
permanent water management system
would be in service.
Resulting sloughing from demolition (left), and infill wall extension, lagging and backfill for LRDC (right)
As expected, during the removal of the wall, after the
rock bolts were installed, large quantities of soil
sloughed from behind.
section of the LRDC wall. The casing
was used to protect the integrity of the
rock bolts during the demolition. As
expected, during the removal of the
wall, after the rock bolts were installed,
large quantities of soil sloughed from
behind. Once the material was removed
from the area, the contractor extended
the infill wall to the east to provide the
permanent support of excavation.
Temporary lagging was installed
between the remaining LRDC wall and
the infill shotcrete wall. The remaining
voided area between the rock face and
the back of the LRDC wall was filled
with #57 stone.
Water seepage from the hillside
above the O'Hara wall posed challenges
during the construction of the SOE
system and caused some concerns for
the long-term performance of the
structure in the permanent condition.
During the design phase, it was
expected that the foundation drainage
system for the O'Hara wall was
performing as intended and would be
integrated into the final building
106 * DEEP FOUNDATIONS * MAY/JUNE 2024
drainage system for the proposed
construction. However, at the time of
construction, O'Hara foundation drains
were discovered but the termination of
the drains were not fully understood nor
Monitoring
Optical monitoring targets were
installed at different points along each
of the existing structures and new SOE
walls. The points were located at the top
of each structure. The targets were read
manual ly by tradi t ional survey
equipment on a weekly basis during the
construction of the SOE systems.
The monitoring campaign did not
start until after phase two of the
construction sequence. Consequently,
any displacement of the O'Hara wall
during this activity was not captured in
the monitoring results. Minor immediate
movement occurred at the existing
walls and the new WPIC wall when the
Overview of final SOE system

May/June 2024

Table of Contents for the Digital Edition of May/June 2024

TOC
May/June 2024 - Intro
May/June 2024 - 1
May/June 2024 - 2
May/June 2024 - TOC
May/June 2024 - 4
May/June 2024 - 5
May/June 2024 - 6
May/June 2024 - 7
May/June 2024 - 8
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https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/september-october-2024
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/july-august-2024
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/may-june-2024
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/march-april-2024
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/january-february-2024
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/november-december-2023
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/september-october-2023
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/july-august-2023
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/may-june-2023
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/Jan-feb-2021_nxtbook
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/july-august-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/march-april-2023
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/january-february-2023
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/november-december-2022
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/september-october-2022
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/july-august-2022
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https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/march-april-2022
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/january-february-2022
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/november-december-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/sept-oct-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/july-aug-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/may-june-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/march-april-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/january-february-2021
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/november-december-2020
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/September-October-2020
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/may-june-2020
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/march-april-2020
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/january-february-2020
https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/july-august-2020
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