January/February 2021 - 75

Borehole televiewer logging at Henry Hudson Bridge. (credit: Hager-Richter)

DFI45 Panel:
Advancing
Geophysics Use
in Subsurface
Characterization
Over the past few decades, a wide
variety of geophysical methods have
steadily become familiar tools for
subsurface characterization as part of
geotechnical investigations. Robust
geophysical techniques can add
significant value due to the broad range
of data acquisition they afford, when
paired with appropriate geologic
settings and project objectives. These
techniques are primarily noninvasive
to minimally invasive and can work in a
multitude of environments. However,
geophysical programs can be poorly
timed, conceived or implemented,
which results in technical observations
that are unsuccessfully interpreted or

AUTHORS

are presented in a way that has limited
value. Such issues lead to tucking away
these results in a geotechnical report
appendix to be forgotten.
To start a conversation about
changing the culture of the way
geophysics is used for geotechnical
subsurface characterization, a panel
discussion was held on October 29,
2020, at DFI's 45th Annual Conference
on Deep Foundations (DFI45). The goal
w a s i m p ro v i n g c o m m u n i c a t i o n
between geophysicists and
geotechnical engineers/geologists who
use geophysical results for geotechnical
investigations. In the panel discussion
that is summarized in this article,
geophysical and geotechnical experts
explored sound investigation planning,
field implementation and presentation
strategies that promote positive
advancements in the routine use of
geophysics for geotechnical subsurface
characterization.
The panel consisted of the following
expert geophysicists, geotechnical
engineers and geologists from agencies
and companies:

FEATURE

ARTICLE

*

Silas Nichols, P.E. (Moderator),
Federal Highway Administration
(FHWA)

*

Robert Garfield, P.G., Hager-Richter
Geoscience

*

Matthew Art, e4sciences

*

Matthew Riegel, P.E., D.GE, HNTB

*

Daniel Schauer, P.G., Geosyntec

*

Krystle Pelham, New Hampshire
Department of Transportation

Presentation and
Case Studies
A brief presentation was given about
how geophysical investigations can be
planned and implemented to provide
results that are presented in a high
quality, clear manner for geotechnical
subsurface characterization. The
presentation focused on the importance
of communication between the
geophysical and geotechnical
engineering teams. Early and clear
communication allows the
geophysicists to understand the project
objectives, along with the surface and

Robert Garfield, P.G., and Jeffrey Reid, P.G., Hager-Richter Geoscience
DEEP FOUNDATIONS * JAN/FEB 2021 * 75



January/February 2021

Table of Contents for the Digital Edition of January/February 2021

Contents
January/February 2021 - Intro
January/February 2021 - 1
January/February 2021 - 2
January/February 2021 - Contents
January/February 2021 - 4
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