DFI publishes new white paper on
Crosshole Sonic Logging (CSL)
DFI announces the release of a new white paper, “Terminology
and Evaluation Criteria of Crosshole Sonic Logging (CSL) as
applied to Deep Foundations.”
The paper was produced by a CSL Task Force comprised of
members of the DFI Codes and Standards Committee, Drilled
Shaft Committee and Testing and Evaluation Committee.
The CSL Task Force was chaired by E. Anna Sellountou, PhD,
PE, Pile Dynamics.
The white paper reviews the state of practice (including
experience gained over the past 20 years), proposes improved
CSL rating criteria and makes recommendations for additional
assessment, as well as educates the industry on the proper
interpretation of CSL testing.
Non-destructive testing of drilled shaft foundations via
CSL is often performed as part of the quality assurance process
to assess the soundness of concrete. The intent of CSL testing
is to identify irregularities such as soil intrusion, necking,
soft bottom, segregation, voids and other defects that could
result in poor structural performance of the foundation.
Over time, CSL rating criteria based on first arrival time and
relative energy have often incorrectly evolved to be the sole
means of determining the acceptability of a shaft. Some of
these criteria have found their way into regulatory agency
specifications, with acceptance values often differing from
agency to agency. The 17-page paper is available at no cost at
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Innovative QA solutions driven by Pile Dynamics, Inc.
As the use of drilled foundations continues to increase,
innovative manufacturers look for ways to optimize these
foundation elements. Coming from a strong background
in deep foundations, Pile Dynamics, Inc. (PDI) can offer
the competency and expertise to develop solutions for
testing drilled shafts. The research and development team
at PDI recognizes areas of concern in drilled shaft practice
that can impact the structure’s performance. The team has
determined several quality control methods that could be
One of the desired improvements in shaft quality control
is the verticality measurement of the excavation. With no
PILE DYNAMICS, INC.
PILING CANADA 75