Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

A data set of undrained cyclic triaxial test with parametrically changing relative density and fines content is reviewed and interpreted in the scope of energy. It is found that the strain amplitude or pore-pressure buildup during cyclic loading is uniquely related to the energy dissipated in soil specimens. This further indicates that a RL (cyclic stress ratio)-Nc (number of cycles) line corresponding to specific soil strain represents a line of equal dissipated energy. An energy-based method (EBM) is proposed in which liquefaction potential can be evaluated by comparing the dissipated energy with upward seismic wave energy with no regard to stress intensity and the number of cycles. EBM developed here is applied to a hypothetical sand deposit shaken by a recorded seismic motion of the earthquake magnitude M=9.0 to compare with a conventional stress-based method (SBM) using the same seismic motion. The two results have similarities and differences, and the similarity tends to be greater, if the effect of M=9.0 is considered in SBM.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Liquefaction Potential Evaluation: Energy-Based Method Compared to Stress-Based Method

Chicago, Illinois

A data set of undrained cyclic triaxial test with parametrically changing relative density and fines content is reviewed and interpreted in the scope of energy. It is found that the strain amplitude or pore-pressure buildup during cyclic loading is uniquely related to the energy dissipated in soil specimens. This further indicates that a RL (cyclic stress ratio)-Nc (number of cycles) line corresponding to specific soil strain represents a line of equal dissipated energy. An energy-based method (EBM) is proposed in which liquefaction potential can be evaluated by comparing the dissipated energy with upward seismic wave energy with no regard to stress intensity and the number of cycles. EBM developed here is applied to a hypothetical sand deposit shaken by a recorded seismic motion of the earthquake magnitude M=9.0 to compare with a conventional stress-based method (SBM) using the same seismic motion. The two results have similarities and differences, and the similarity tends to be greater, if the effect of M=9.0 is considered in SBM.