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Monitoring Vibrations and Airblast Construction Blasting
Aimone-Martin Associates, LLC have extensive
field experience working with blasting personnel and contractors to mitigate
vibrations
and air pressure (airblast) from rock blasting and other applications of
explosives. Our company's prime focus is risk
assessments and reducing liabilities of off-site impacts for blasting
operations. Community members' concerns regarding
potential property damage from repetitive blasting must be continually
addressed throughout blasting project development. We
provide a sound public relations program starting with timely pre-blast community
meetings, structure condition surveys and specialized structure
instrumentation and analysis. Throughout blasting operations, our company performs a series of vibration
studies as part of a site characterization plan, followed with carefully planned off-site vibration and air pressure
monitoring. We work closely with the blaster to ensure that best practices and methods are employed to reduce vibrations and airblast to
the lowest possible levels. Our public relations efforts continue throughout and past the project and to ensure that the public
is kept informed about the safe blasting practices
conducted in their community, perform additional seismograph monitoring when
requested, perform post-blast inspection in
response to possible structure damage concerns, and talk with home owners to
help alleviate these concerns. With a sound
community relations plan that includes monitoring and on-going public
communication, blasters and developers can be assured
that their work can be completed with community sensitivity in mind.
Attenuation
Surveys
Attenuation surveys are useful to characterize a blast site with respect to attenuation or decrease in ground motion intensity and measure terrain or wind effects for airblast. We characterize site geology and vibration energy coupling as it may affect off-site structure motions. Attenuation of ground motions employing regressing techniques are extremely useful for the prediction ground vibrations and when modifying blast design parameters. A large number of seismographs, placed in linear arrays in different compass or azimuthal directions, are employed during blasts. Attenuation surveys ca be used to
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identify site geological controls
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minimize ground vibrations, airblast and noise
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predict worst-case vibrations at off-site structures
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assist in the control of backbreak and fragmentation
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help establish optimum delay timing for the blast design
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assess seismograph data quality
Seismograph
monitoring services
Monitor of each blast is essential to ensure compliance with frequency-based safe vibration standards.
Pre-blast surveys of structures
Structure condition
surveys are necessary to manage construction blasting liabilities. High
resolution digital stills and digital
videos are used to document pre-existing defects in structures near future
blasting operations. A complete engineering report is
provided with each survey.
Damage claims assessment
Structure
damage claims assessments require skill to identify subsurface soil and rock
conditions, foundation problems, and
other environmental conditions leading to structure defects. Our experienced
engineers are experts in soil and rock mechanics as well as foundation design
and apply sound engineering principles to differentiate construction-related
damages from natural and expected defects in structures.
Videography of existing site conditions
Digital movies can be provided to establish baseline pre-construction site conditions.
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equipment vibration
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