DFI Magazine September/October 2020 - 93

FEATURE

Six piles in soil pit for lateral load testing

ARTICLE

Lateral Loading of Rock-Socketed Piles
Constructing bored piles (drilled shafts) with rock sockets offers an
ideal solution to maximize resistance against vertical and
horizontal loading. However, closely spaced transverse
reinforcements in the rock socket that are required for analysis
and/or code requirements can obstruct concrete flow and pose a
high risk of creating defective concrete. Moreover, it is unknown
whether this much transverse reinforcement is actually needed to
ensure adequate pile performance.
When designing rock-socketed pile foundations to address
combined vertical and lateral loading, the lateral load analysis is
typically performed by representing geomaterials with springs of
different stiffness that simulate the load-deformation behavior of
the respective layers. This method, referred to as a p-y analysis, is
derived from the bending equation of a beam supported on a bed of
springs. When this method is used to predict shear and moment
demands of a rock-socketed shaft, the abrupt decrease in moment
immediately below the soil-rock interface produces a drastic
"spike" in the pile shear force. It is often convenient to quantify
shear amplification as a function of the shear imposed at the pile
head; the p-y method has been known to result in amplified rocksocket shear on the order of 5 to 10 times the pile head shear. This

AUTHORS

General pile configuration, rebar layout example (for Specimen 1)

Anne Lemnitzer, Ph.D., P.E., and Rabie Farrag, University of California, Irvine, and Benjamin Turner, Ph.D., P.E., G.E.,
Dan Brown and Associates

DEEP FOUNDATIONS * SEPT/OCT 2020 * 93



DFI Magazine September/October 2020

Table of Contents for the Digital Edition of DFI Magazine September/October 2020

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