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Seismic Behavior of Peaty Organic Soil Under Delta Levees

Study on seismic behavior of peat under Delta levees to predict performance during earthquakes. Explore soft peat properties, consolidation, & risk management strategies.

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Seismic Behavior of Peaty Organic Soil Under Delta Levees

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  1. Field Test of Model Levee on Sherman Island Peaty Organic Soil Scott J. Brandenberg (PI) Jonathan P. Stewart (co-PI) Robb E.S. Moss (co-PI) Edward T. Reinert (GSR) July 12th, 2012

  2. The Delta

  3. Big Water Projects

  4. Pre-European Delta (before 1850)

  5. Reclamation of the Delta (1850-1930)

  6. Reclamation of the Delta (1850-1930) • A “levee war” ensued in which reclamation efforts focused on making my levee taller than my neighbor’s levee.

  7. Land Subsidence

  8. Land Subsidence

  9. Seismic Hazard

  10. Engineering Properties of Peat • Peaty organic soil underlies many Delta levees, and is extremely soft and compressible. • Very little is known about its seismic behavior, and it’s therefore difficult to predict how it will perform during earthquakes. • This study examines the seismic behavior of peat beneath levees.

  11. How Soft is the Peat? Movie

  12. Consolidation

  13. Cyclic Loading of Peat

  14. Consolidation

  15. Test Location Movie

  16. MK-15 Mobile Field Shaker Movie

  17. Deep Groundwater Table

  18. Questions?

  19. Liquefaction is reasonably well understood from an engineering perspective compared with the behavior of peat, and our study therefore does not focus on liquefaction. Delta Risk Management Strategy predicts 90% of levee failures in Delta earthquake will be caused by liquefaction beneath and within the levees.

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