| Abstract: | A ground penetrating radar (GPR) experiment at the Treasure Island Test Site [TILT] was performed to non-destructively image the soil column for changes in density prior to, and following, a liquefaction event. The intervening liquefaction was achieved by controlled blasting. A geotechnical borehole radar technique was used to acquire high-resolution 2-D radar velocity data. This method of non-destructive site characterization uses radar trans-illumination surveys through the soil column and tomographic data manipulation techniques to construct radar velocity tomograms, from which averaged void ratios can be derived at 0.25-0.5 m pixel footprints. Tomograms of void ratio were constructed through the relation between soil porosity and dielectric constant. Both pre- and post-blast tomograms were collected and indicate that liquefaction related densification occurred at the site. Volumetric strains estimated from the tomograms correlate well with the observed settlement at the site. The 2-D imagery of void ratio can serve as high-resolution data layers for numerical site response analysis. |
| Genre: | Conference Paper |
| ProdID: | 70023094 |
| Citation Author: | Kayen, R. E.; Barnhardt, W. A.; Ashford, S.; Rollins, K. |
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| Citation End Page: | 65 |
| Citation Issue: | 110 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geotechnical Special Publication |
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| Citation Number Of Pages: | 14 |
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| Citation Publisher: | ASCE |
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| Citation Search Results Text: | Non-destructive measurement of soil liquefaction density change by crosshole radar tomography, Treasure Island, California; 2000; Conference Paper; Geotechnical Special Publication; Kayen, R. E.; Barnhardt, W. A.; Ashford, S.; Rollins, K. |
| Citation Start Page: | 52 |
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| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Non-destructive measurement of soil liquefaction density change by crosshole radar tomography, Treasure Island, California; 2000; Conference Paper; Geotechnical Special Publication; Kayen, R. E.; Barnhardt, W. A.; Ashford, S.; Rollins, K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
| Publisher: | ASCE |
