United States Department of Transportation
i
Integrated geophysical methods for geotechnical subsurface investigations : final report.
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2006-01-01
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[PDF-7.16 MB]
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Edition:Final report.
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Abstract:This report summarizes the New Hampshire Department of Transportation’s (NHDOT’s) investigation of
geophysical techniques to supplement conventional test borings and other explorations on transportation projects.
The Department’s geotechnical investigations often encounter bedrock or unstable soils at variable depths over
short lateral distances. Test borings are point specific and may miss sudden depth changes and variations in the
soil and rock properties. Additional borings can be expensive and time consuming and may even result in a more
puzzling subsurface interpretation. Site conditions and/or highly conductive soil properties can sometimes limit the
use of the NHDOT’s ground penetrating radar equipment, but through the implementation of additional geophysical
techniques the Department has enhanced its capabilities and helped alleviate some of the uncertainties that arise
when making subsurface interpretations based solely on conventional exploration methods.
This report presents both successful and less successful case histories utilizing resistivity imaging and
seismic refraction in conjunction with test borings and ground penetrating radar to characterize a transportation
project’s subsurface conditions. The methods employed in using these geophysical techniques, the results of the
geophysical investigations, and how these results were calibrated and verified are presented.
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