July/August 2022 - 100

Overview of completed port
of existing 18 and 24 in (457 and 610 mm)
square, prestressed concrete piles was
selected from the project initiation to
reduce the cost of new foundations and
limit the construction duration and
corresponding impact on port activities.
The existing piles are driven
through soft clay into the Cooper Marl
formation, where the piles develop
most of their capacity through skin
friction. Piles driven in the Cooper Marl
formation are known to exhibit
considerable pile setup, but most setup
information is based on restrikes
performed within weeks of initial
New piles increased the capacity
Client
Submitted By
Financial Savings
Program Costs
Time Savings
In-Situ Testing
South Carolina Ports Authority
S&ME
$9 million
Six months
Less than $300,000
driving. For the port upgrade, with 20to
30-year-old piles, the setup was
hypothesized to be even greater. The
project team performed dynamic tests
on two piles during restrikes.
Results
The existing piles were not retrofitted,
but new piles were added to the port
structure to increase the total capacity.
Cost Savings
Compared to initial estimates, results of
the dynamic tests increased the
allowable pile bearing resistance by 60
to 120% for the 18 in (457 mm) piles and
40 to 90% for the 24 in (610 mm) piles.
The corresponding reduction in the
number of required new piles produced
considerable benefits. The direct
foundation cost savings were estimated
to be $9 million. In addition, the
construction schedule was shortened
by six months, which results in
valuable indirect savings considering
the economic impact of disrupting port
activities. These massive savings were
achieved through a testing program
that cost less than $300,000.
100 * DEEP FOUNDATIONS * JULY/AUG 2022

July/August 2022

Table of Contents for the Digital Edition of July/August 2022

TOC
July/August 2022 - Intro
July/August 2022 - 1
July/August 2022 - 2
July/August 2022 - TOC
July/August 2022 - 4
July/August 2022 - 5
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