Location

St. Louis, Missouri

Session Start Date

4-2-1995

Session End Date

4-7-1995

Abstract

Several centrifuge model dams were tested with the conditions similar to those of O'Neill Forebay Dam, California to examine the structural behavior under seismic excitation. A few experiments were carried out to study the performance of the dam, whose geometry was still the same as O'Neill Dam, but the soil properties were altered by adding some gravel or increasing the compaction density. The results of either test clearly demonstrated a stiffer response to seismic excitation than the model with the original prototype material properties. Characteristics of O'Neil! Forebay Dam with different structural modifications were examined. These included construction of a berm at the downstream side of the model dam, which has been proposed and designed recently for the prototype dam by the Bureau of Reclamation personnel as a part of dam rehabilitation program to strengthen the structure, as well as addition of a rip-rap layer on downstream. The earthquake simulation tests conducted on these model dams with the various structural modifications suggested that the performance of the dam with any of above-mentioned reinforcement was somewhat stiffer than that of the current O'Neill Dam configuration. The response of the structure under various excitation intensities was also examined by increasing the magnitude of the input excitation but keeping the same frequency contents. Some models were tested with the embankment overlaying on a rigid base, while the others included an alluvium foundation underneath the dam.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Third Conference

Publisher

University of Missouri--Rolla

Publication Date

4-2-1995

Document Version

Final Version

Rights

© 1995 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 2nd, 12:00 AM Apr 7th, 12:00 AM

Model Parametric Studies of the Earthquake Response of the Embankment Dam

St. Louis, Missouri

Several centrifuge model dams were tested with the conditions similar to those of O'Neill Forebay Dam, California to examine the structural behavior under seismic excitation. A few experiments were carried out to study the performance of the dam, whose geometry was still the same as O'Neill Dam, but the soil properties were altered by adding some gravel or increasing the compaction density. The results of either test clearly demonstrated a stiffer response to seismic excitation than the model with the original prototype material properties. Characteristics of O'Neil! Forebay Dam with different structural modifications were examined. These included construction of a berm at the downstream side of the model dam, which has been proposed and designed recently for the prototype dam by the Bureau of Reclamation personnel as a part of dam rehabilitation program to strengthen the structure, as well as addition of a rip-rap layer on downstream. The earthquake simulation tests conducted on these model dams with the various structural modifications suggested that the performance of the dam with any of above-mentioned reinforcement was somewhat stiffer than that of the current O'Neill Dam configuration. The response of the structure under various excitation intensities was also examined by increasing the magnitude of the input excitation but keeping the same frequency contents. Some models were tested with the embankment overlaying on a rigid base, while the others included an alluvium foundation underneath the dam.