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Plane Strain Versus Axisymmetric Modeling of the Natomas Levees - A Case Study
The Natomas basin is a 21,450 hectare area north of downtown Sacramento. The developed area relies on levees for flood protection along its entire perimeter. The western boundary is a 29.9 km long levee that protects the area from flooding by the Sacramento River. Since its construction more than a century ago, this clay-capped sand levee has experienced a myriad of performance issues stemming from excessive under- and through-seepage. Recently, a team of engineers completed design and construction of remedial measures with the objective of ending the historic performance issues. From the United States Army Corps of Engineers Levee Stations 576+00 to 602+00, the Sacramento River and levee make a bend of about 95 degrees at a constant levee radius of about 488 m. During the recent design processes, the levee was analyzed using a two-dimensional plane strain model, despite this relatively sharp convex bend. This paper presents a case study that uses the plane strain and axisymmetric numerical models to directly compare the results of seepage and slope stability analyses. The computed gradients for the axisymmetric case are higher than those computed using a plane strain formulation. The increase is not systematic and is unique to each cross-section.
Plane Strain Versus Axisymmetric Modeling of the Natomas Levees - A Case Study
The Natomas basin is a 21,450 hectare area north of downtown Sacramento. The developed area relies on levees for flood protection along its entire perimeter. The western boundary is a 29.9 km long levee that protects the area from flooding by the Sacramento River. Since its construction more than a century ago, this clay-capped sand levee has experienced a myriad of performance issues stemming from excessive under- and through-seepage. Recently, a team of engineers completed design and construction of remedial measures with the objective of ending the historic performance issues. From the United States Army Corps of Engineers Levee Stations 576+00 to 602+00, the Sacramento River and levee make a bend of about 95 degrees at a constant levee radius of about 488 m. During the recent design processes, the levee was analyzed using a two-dimensional plane strain model, despite this relatively sharp convex bend. This paper presents a case study that uses the plane strain and axisymmetric numerical models to directly compare the results of seepage and slope stability analyses. The computed gradients for the axisymmetric case are higher than those computed using a plane strain formulation. The increase is not systematic and is unique to each cross-section.
Plane Strain Versus Axisymmetric Modeling of the Natomas Levees - A Case Study
Merry, Scott (author) / Du, Rongqiang (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 1511-1524
2014-02-24
Conference paper
Electronic Resource
English
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