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Advanced Subsurface Investigations Beyond the Borehole with Passive Seismic Horizontal-to-Vertical Spectral Ratio and Electromagnetic Geophysical Methods at Transportation Infrastructure Sites in New Hampshire
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2023-08-01
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[PDF-3.55 MB]
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Edition:Final Report
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Abstract:Geotechnical site characterization sometimes fails to fully characterize the below-ground bedrock surface and hydrologic conditions using conventional borings. By combining geophysical and boring data analysis, transportation projects can produce a more thorough and accurate representation of geotechnical subsurface conditions, reducing the disruption work plans, forced revision of designs, and cost increases from schedule delays, claims, or change orders. The U.S. Geological Survey (USGS), in cooperation with New Hampshire Department of Transportation (NHDOT) surveyed transportation infrastructure sites using rapidly deployable geophysical methods to assess benefits added to a comprehensive site characterization with traditional techniques. Horizontal-to-vertical spectral-ratio (HVSR) passive-seismic and electromagnetic induction (EMI) methods were applied at four sites including a roadway-stream crossing, roadway-bridge rail-trail crossing, commuter-parking expansion, and a railroad-adjacent river-cutback slope-failure site, Additionally, ground-penetrating radar (GPR) was used at the slope-failure site. Typically, at transportation projects, subsurface geotechnical properties are determined from boring data; however, borings are often spaced hundreds of feet apart, potentially missing important spatial variability between boreholes. Geotechnical site characterization including geophysical surveys helped to provide a more accurate characterization by using continuous or near continuous profiling.
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