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National Geotechnical Experimentation Sites (NGES)

National Geotechnical Experimentation Sites (NGES). Objective : to provide researchers with well-characterized sites, on problem soils, where new exploration techniques can be tested. Case History: Treasure Island NGES. Support: NSF, CSMIP, PEER, FHWA. Site selection criteria:.

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National Geotechnical Experimentation Sites (NGES)

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  1. National GeotechnicalExperimentation Sites(NGES) Objective: to provide researchers with well-characterized sites, on problem soils, where new exploration techniques can be tested.

  2. Case History:Treasure Island NGES Support: NSF, CSMIP, PEER, FHWA

  3. Site selection criteria: • Strong probability of non-linear soil behavior/liquefaction • Long-term access • Safety from vandalism

  4. YBI

  5. Site Characterization:How much is sufficient? • Minimum field/laboratory data required? • Types of tests? • Number of tests? • If resources available, what would ideal test suite look like?

  6. Site Instrumentation:How much is sufficient?How much would be ideal? • Distribution of instruments? • Types of instruments?

  7. Yerba Buena Island

  8. 400 300 E M 200 U S G S 100 Y B I T I M S L 0 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 elevation [ft] -100 Clays and sands -200 Franciscan Assemblage: -300 sandstones and shales -400 -500 Distance, [ft]

  9. What Next?

  10. John Boatwright Pedro de Alba Vladimir Grazier Thomas L. Holzer Faiz Makdisi Yoshi Moriwaki Maury S. Power Cliff Roblee Anthony F. Shakal Walter Silva J. Carl Stepp T. Leslie Youd Advisory Committee: GEPC

  11. Future Work Short-term: Re-establish on-line database Drilling at YBI instrument site Reflection bedrock survey NW-SE line Replacement of failed piezometers Other?

  12. Future Work Long-Term: • Continued existence of GEPC • Inclusion of site in TI development plans • Treasure Island as focus of ground-motion prediction exercises • “Real-time” data recovery • Other?

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