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Analysis of Liquefaction at a Bridge Site in the 2014 Napa Earthquake
An evaluation of liquefaction triggering and deformation analyses for both banks of the Napa River at the crossing of the Napa Valley Wine Train Bridge during the August 24, 2014 Magnitude 6.0 Napa Earthquake is presented. The subsurface stratigraphy, including differences between the point bar and cut bank sides of the river channel, are described using results of cone penetration test (CPT) soundings and borings with standard penetration test (SPT) data. Liquefaction triggering analyses are performed using a simplified procedure and equivalent linear site response analyses. The potential for lateral deformations and settlements are evaluated using one-dimensional liquefaction vulnerability indices and Newmark sliding block methods. The analysis results indicate that liquefaction effects would not be expected on the cut-bank side of the channel, whereas minor amounts of liquefaction-induced settlements would be expected on the point bar side. There were no visible or reported ground deformations, cracks, or differential settlements at or near the bridge abutments on either side of the channel. Possible reasons for the discrepancy between observed and predicted behavior on the point bar side of the channel are discussed.
Analysis of Liquefaction at a Bridge Site in the 2014 Napa Earthquake
An evaluation of liquefaction triggering and deformation analyses for both banks of the Napa River at the crossing of the Napa Valley Wine Train Bridge during the August 24, 2014 Magnitude 6.0 Napa Earthquake is presented. The subsurface stratigraphy, including differences between the point bar and cut bank sides of the river channel, are described using results of cone penetration test (CPT) soundings and borings with standard penetration test (SPT) data. Liquefaction triggering analyses are performed using a simplified procedure and equivalent linear site response analyses. The potential for lateral deformations and settlements are evaluated using one-dimensional liquefaction vulnerability indices and Newmark sliding block methods. The analysis results indicate that liquefaction effects would not be expected on the cut-bank side of the channel, whereas minor amounts of liquefaction-induced settlements would be expected on the point bar side. There were no visible or reported ground deformations, cracks, or differential settlements at or near the bridge abutments on either side of the channel. Possible reasons for the discrepancy between observed and predicted behavior on the point bar side of the channel are discussed.
Analysis of Liquefaction at a Bridge Site in the 2014 Napa Earthquake
Darby, Kathleen M. (author) / McIlroy, Martin W. (author) / Boulanger, Ross W. (author) / DeJong, Jason T. (author)
Geotechnical Frontiers 2017 ; 2017 ; Orlando, Florida
Geotechnical Frontiers 2017 ; 277-289
2017-03-30
Conference paper
Electronic Resource
English
Analysis of Liquefaction at a Bridge Site in the 2014 Napa Earthquake
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