IFCEE 2021 PDCA INVITED LECTURE
Presentation Topic: Effects of Pile Driving on Structure
Excitations
Presenter: Dr. Catherine Aimone-Martin, Emeritus Professor, New
Mexico Institute of Mining and Technology
This presentation will address best practices for monitoring
construction vibrations and adjacent structure excitations. Dr.
Catherine Aimone-Martin will discuss instrumentation systems
and analysis methods utilized to develop site propagation (attenuation)
models, structure wall cracking potential based on vibratory
induced global strains and structure settlement.
Examples of modern instrumentation systems used to record
velocity, frequency and displacements adjacent to structure
foundations supplemented with structure-mounted geophones
and displacement gauges placed over existing wall cracks will be
shown from several projects. Dynamic structure excitation measurements
of global strain and the opening and closing of existing
wall cracks recorded during pile driving are compared with those
from human activities, wind loading and quasi-static changes
in daily temperature and humidity. Such normal and expected
environmental influences are shown to induce wall strains far
in excess of those from construction. Instrument systems are
designed to be transparent, provide immediate and continuous
measurements to the contractor, support realistic compliance
limits corresponding with damage criteria and provide a scientific
basis to address complaints and claims so that construction
can continue on schedule and within budget.
A review of standards to limit vibrations at structures in the
U.S. and abroad will highlight how the perception of possible structure
damage and vibration-related complaints drive regulations
rather than scientific studies supported by measurements and
damage observations. As a result, impact and vibratory pile driving
operations often must comply with untenable vibration limits.
Unrealistic low vibration criteria have been shown to slow construction
and increase costs.
Case site examples of attenuation modeling and structure measurements
will be provided for pile extraction and driving projects
in a variety of subsurface geologies under saturated conditions
including the Port of Juneau, Alaska’s cruise ship berths, bridge and
building foundations.
IFCEE 2021 PDCA SHORT COURSE
Presentation Topic: Deep Foundations QA/QC for Engineers,
Contractors and Inspectors
Presenters: Mohamad Hussein, P.E., GRL Engineers, Inc. and Michael
Justason, P.Eng., McMaster University
This course will provide an overview of common methods of QA/
QC for deep foundations and provides some perspectives on the
value of QA/QC from design and construction points-of-view.
The course includes a discussion of factors to consider during the
design phase of a project, during installation and post-construction,
as well as a short specifications overview. The course introduces
the main methods for performing inspections and testing
for driven piles, drilled shafts and augercast piles, although many
of the methods described also apply to other types of deep foundations.
The effect of well-planned and well-executed QA/QC programs
on the design and construction of more cost-effective, efficient
and reliable deep foundations will be discussed with experts
in the area of deep foundations. t
maxborovkov / 123rf
IFCEE 2021
42 | ISSUE 6 2020 www.piledrivers.org
/www.piledrivers.org
