Geotechnical Engineering Seminar

Start Date: 
Wednesday, November 9, 2016 - 4:00pm to 5:30pm

GGB 2029

Richard D. Woods, professor emeritus, University of Michigan

Consequences of Vibration from High-Energy Construction Operations Including Impact Pile Driving

Many construction operations result in the propagation of seismic waves in the ground surrounding the site. These vibrations are potentially damaging to nearby infrastructure either by direct impact of the ground wave or by settlement caused by shakedown settlement of loose sands. To evaluate potential damage it is necessary to convert applied energy to ground motion (vibration) through coupling mechanism and to trace the decay of those vibrations to whatever facility is of concern. The amplitude of the vibration reaching the target facility must then be compared to a standard criteria for damage or for annoyance to people. Methods of converting energy to particle velocity and charts of scaled distance are presented to estimate ground motion at the source and at any distance from the source. Guidance in selecting attenuation coefficients based on specific soil properties or on experience is presented. Finally, some criteria for limits of tolerable vibration levels are presented for both structural and human response.

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