United States Department of Transportation
i
Deep Soil Test Borings to Determine Shear Wave Velocities Across South Carolina
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2019-10-01
[PDF-4.00 MB]
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Abstract:Having an accurate shear wave velocity profile and a better understanding of dynamic behavior of the deep soil deposits in the South Carolina Coastal Plain are critical for seismic hazard analyses of critical transportation infrastructure. This research presents a study that obtained comprehensive field and laboratory measurements of shear wave velocity and dynamic soil behaviors for two sites in the South Carolina Coastal Plain where data was limited. Site A is located near Conway in Horry County and Site B is located in Andrews in Williamsburg County. Geotechnical borings were drilled at these two locations to depths of 505 and 615 ft to perform extensive geotechnical and geological site characterization. Shear wave velocity profiles were developed using several geophysical testing methods including P-S suspension logging, full waveform sonic logging, a combined multi-channel analysis of surface waves and spectral analysis of surface waves, and a combined multi-channel analysis of surface waves and microtremor array measurement methods. The developed profiles were compared, and similarities and differences were discussed in this report. Shear modulus and damping behaviors over a wide range of strains for soil and rock samples collected from both sites were evaluated using resonant column and torsional shear methods. It was found that the behaviors of materials obtained from Tertiary and Cretaceous deposits deviated from the empirical predictions based on plasticity index and geologic age. Based on the results, the predictive curves for shear modulus and damping curves are not recommended for older soil deposits, particularly for those samples with cementation.
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