Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

This paper focuses on the seismic stability analysis of a hydraulic fill dam built in the mid-1920’s. The material properties of the dam were characterized using data from soil borings, standard penetration, cone penetration and shear wave velocity tests. An effective stress analysis approach was used for the analysis. A finite difference code, Fast Lagrangian Analysis of Continua (FLAG), provided static and dynamic shear stresses, excess pore water pressures, and deformations. The results obtained from the effective stress analyses are compared to the results of liquefaction potential analyses based on SPT and CPT data. For seismic excitation, a real acceleration-time history and a sinusoidal wave with the same peak ground acceleration are applied to the dam. In addition, constructing a berm to the downstream slope of the dam and increasing the freeboard by lowering the water level in the reservoir are modeled and analyzed as two different rehabilitation alternatives. The analysis revealed the following: 1) Limited liquefaction in the core of the dam would take place under the conditions modeled. 2) The dam would exhibit larger deformations under sinusoidal wave condition, as compared to the real acceleration - time history. 3) Both of the remediation techniques would significantly improve seismic stability of 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

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

COinS
 
Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Seismic Stability and Rehabilitation Analysis of a Hydraulic Fill Dam

San Diego, California

This paper focuses on the seismic stability analysis of a hydraulic fill dam built in the mid-1920’s. The material properties of the dam were characterized using data from soil borings, standard penetration, cone penetration and shear wave velocity tests. An effective stress analysis approach was used for the analysis. A finite difference code, Fast Lagrangian Analysis of Continua (FLAG), provided static and dynamic shear stresses, excess pore water pressures, and deformations. The results obtained from the effective stress analyses are compared to the results of liquefaction potential analyses based on SPT and CPT data. For seismic excitation, a real acceleration-time history and a sinusoidal wave with the same peak ground acceleration are applied to the dam. In addition, constructing a berm to the downstream slope of the dam and increasing the freeboard by lowering the water level in the reservoir are modeled and analyzed as two different rehabilitation alternatives. The analysis revealed the following: 1) Limited liquefaction in the core of the dam would take place under the conditions modeled. 2) The dam would exhibit larger deformations under sinusoidal wave condition, as compared to the real acceleration - time history. 3) Both of the remediation techniques would significantly improve seismic stability of the dam.