Numerical Analysis of a New Levee Embankment Founded on Young San Francisco Bay Mud-PPT Presentation

PPT Presentation

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The study evaluates a proposed flood-risk-management levee along the San Francisco Bay, founded on approximately 20 feet of highly compressible Young Bay Mud. The project also includes ecosystem-restoration and recreation goals.<br /><br />Researchers combined field investigations and laboratory testing to establish soil properties, including the strength and consolidation behavior of the upper, desiccated mud crust. They used GeoStudio’s Slope/W, Seep/W, and Sigma/W tools to model preconstruction stress history, undrained loading during staged fill placement, consolidation, seepage, and time-dependent settlement.<br /><br />The analyses indicate that the design meets the cited minimum factor-of-safety criteria: 1.3 at the end of construction, 1.4 for long-term stability under steady-state seepage, and 1.0 for rapid drawdown. Earthquake stability was not determined.<br /><br />A key finding is that the waiting period between construction stages, aided by wick drains, can effectively dissipate pore pressure and allow settlement before the next stage of fill. The study concludes that integrating site-specific field and laboratory data with numerical simulation provides a useful outlook on levee performance and supports more effective design of embankments on soft soils.

Keywords

flood-risk management

San Francisco Bay

levee design

Young Bay Mud

soil consolidation

settlement analysis

GeoStudio

pore pressure dissipation

wick drains

embankment stability