FEATURE
pile was installed but before it was load
tested. One can see from these data that
any correlation of pre-construction insitu
test data with pile capacity will be
subject to the changes in the actual insitu
soil characteristics as influenced by
the pile installation.
One might think that casing in a drilled
shaft can support high lateral stress and
mitigate any relaxation; however, a high
lateral stress on the casing would preclude
the ability to twist it into place.
Temporary casing is typically equipped
with an oversized cutting shoe to reduce
the friction by allowing a bit of inward
soil movement so that arching around
the casing can develop in the soil. One
could drive the casing into place as per a
driven pile, but unless it’s intended to be
Figure 6: CPT data at
two pile locations from a
sandy soil site in Belgium
(from Bottiau, 2014)
a permanent casing, retrieving the casing
might become problematic.
As concrete fills the hole, the outward
radial stress of the fluid concrete potentially
recovers much of the in-situ radial
stress. The resulting radial stress may be
related to the concrete slump and rebar
cage congestion, although the long-term
APF Timber
Uplift Connector
Model TC-7612
Sheet Pile
Connector
Timber Uplift
Connector Galvanized
Model TC-7612
Provides tension
capacity of 12 tons
Box 1264 Clifton, NJ 07012-1264
NEW
Tel. 973-773-8400/800-526-9047 / Fax. 973-773-8442
Email: apf@associatedpile.com Website: www.associatedpile.com
Proudly serving
the industry
since 1986!
• Geotechnical Engineering
• Soil and Rock Mechanics
• Shoring and Underpinning Design
• Pile Load Testing and Inspection
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•• Third Party Inspections
• Survey Layout
Continued on page 73
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