PDA tests should be repeated on several of
the probe piles as part of a retap program
to determine if either pile setup is occurring
or some relaxation has resulted with time.
TIM KUECwKEwN w.shorelinesteel.com
Sales Cell: (586) 615-8753
Interlocking Steel Sheet Piling
Fully Melted and Manufactured in the USA
57760 Main St., Suite 2 • New Haven, MI 48048
(800) 522-9550 • (586) 749-9559 • Fax (586) 749-
6653
TIM KUECKEN
New Haven, Michigan
Phone: 586.749.9559
Fax: 586.749.6653
Email: timk.shorelinesteel@gmail.com
TOM WILLEY
Paducah, Kentucky
Phone: 270.444.0088
Fax: 270.441.0055
Email: tomwilley@shorelinesteel.com
www.shorelinesteel.com
PILE DRIVING PROCESS
about a week before conducting a retap,
it is more typical to wait only one to three
days since pile driving is almost always
controlled by the time schedule. Being
able to measure pile setup is particularly
important when driving piles in cohesive
soils, where much of the initial soil capacity
has been lost due to pore pressure
buildup and shear failure from the driving.
Inclusion of the typical setup capacity
gain reduces the overall foundation costs.
It is important to delay final cutoff of the
probe piles until the final driving criteria
are established if it becomes necessary to
redrive these piles.
Evaluate and adjust the driving criteria
based on the PDA. In a perfect
world, the results of the PDA would precisely
match the initial static calculations
and wave equation analysis. But this is
not a perfect world. The capacity determined
from the wave equation analysis
and the PDA should be compared. When
analyzing the PDA results for capacity,
the data are usually evaluated by
CAPWAP®, a signal matching process that
extracts the resistance distribution and
soil behavior such as damping and stiffness
from the PDA measurements and
provides an important and useful simulated
static load analysis. If the capacity
from the PDA is less than that predicted
by the wave equation analysis, the actual
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