Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Limitations of computer storage capacity and high costs have generally restricted the use of numerical methods to two-dimensional dynamic analyses of earth dams. However, differences in canyon topographies in which the earth dams have been built may cause various constraining effects. Comparison between results of plane strain and three-dimensional dynamic analyses may reflect the site effects especially in narrow canyons. Consequently, considering the geometry of canyon, one may choose an appropriate method of dynamic analysis. This paper presents the effect of different canyon geometries on amount and distribution of induced dynamic stresses in plane strain and in three-dimensional analyses. These analyses are executed by FLAC2D and FLAC3D for some sections of earth dams with different length to height ratios. It has been shown that the ratios of plain strain to 3D dynamic shear stresses reach their maximum and minimum values in triangular and rectangular shaped canyons, respectively. With complimentary studies the actual seismic behavior of earth dams could be estimated from plane strain dynamic 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

The Effects of Canyon Topography on Dynamic Stress Distribution in Earth Dams

San Diego, California

Limitations of computer storage capacity and high costs have generally restricted the use of numerical methods to two-dimensional dynamic analyses of earth dams. However, differences in canyon topographies in which the earth dams have been built may cause various constraining effects. Comparison between results of plane strain and three-dimensional dynamic analyses may reflect the site effects especially in narrow canyons. Consequently, considering the geometry of canyon, one may choose an appropriate method of dynamic analysis. This paper presents the effect of different canyon geometries on amount and distribution of induced dynamic stresses in plane strain and in three-dimensional analyses. These analyses are executed by FLAC2D and FLAC3D for some sections of earth dams with different length to height ratios. It has been shown that the ratios of plain strain to 3D dynamic shear stresses reach their maximum and minimum values in triangular and rectangular shaped canyons, respectively. With complimentary studies the actual seismic behavior of earth dams could be estimated from plane strain dynamic analyses.