Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Guidance for the Corps of Engineers requires the use of seismic deformation analysis in the evaluation of existing dams for seismic loads and in the validation of remediation design for seismically deficient embankment dams. The Corps uses a phased approach for evaluating the seismic safety. For dams with significant seismic loads, problem soils, high risk, or those where simple analyses identified seismic concerns, a more advanced deformation analysis is generally required. A major challenge in these analyses is the selection of a reliable constitutive model when liquefiable materials are present. The computer program FLAC, in conjunction with a modified version of the UBCSAND constitutive model, has been instrumental in determining the necessity of seismic retrofit at Corps’ embankment dams and in selecting effective remediation alternatives. The primary objective of this paper is to describe the current practice of the Corps in applying a phased analysis approach and to discuss selected considerations in performing these analyses.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Corps of Engineers Practice in the Evaluation of Seismic Deformation of Embankment Dams

San Diego, California

Guidance for the Corps of Engineers requires the use of seismic deformation analysis in the evaluation of existing dams for seismic loads and in the validation of remediation design for seismically deficient embankment dams. The Corps uses a phased approach for evaluating the seismic safety. For dams with significant seismic loads, problem soils, high risk, or those where simple analyses identified seismic concerns, a more advanced deformation analysis is generally required. A major challenge in these analyses is the selection of a reliable constitutive model when liquefiable materials are present. The computer program FLAC, in conjunction with a modified version of the UBCSAND constitutive model, has been instrumental in determining the necessity of seismic retrofit at Corps’ embankment dams and in selecting effective remediation alternatives. The primary objective of this paper is to describe the current practice of the Corps in applying a phased analysis approach and to discuss selected considerations in performing these analyses.