Location

St. Louis, Missouri

Session Start Date

4-2-1995

Session End Date

4-7-1995

Abstract

Shear modulus of a soil layer increases with the effective confining stress. This results in a reduction in the propagation velocity of shear waves as they travel from the bed rock towards the soil surface. In a centrifuge model prototype stresses and strains are recreated at homologous points. Thus the effective confining stress and hence the shear modulus will vary with depth in a centrifuge model. This results in a change in the propagation velocity of the shear waves as they travel from the base of the container towards the soil surface. This change in the propagation velocity was investigated by performing non-linear finite element analyses using simple single pulse and sinusoidal ground motion as well as more realistic bed rock accelerations. Based on the results from these analyses it was concluded that the variation of shear modulus with effective confining stress results in a reduction in the propagation velocity as the shear waves travel to oil surface. Also the frequency of the input bed rock motion suffers some dispersion.

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

Numerical Modelling of Shear Wave Propagation in Centrifuge Models

St. Louis, Missouri

Shear modulus of a soil layer increases with the effective confining stress. This results in a reduction in the propagation velocity of shear waves as they travel from the bed rock towards the soil surface. In a centrifuge model prototype stresses and strains are recreated at homologous points. Thus the effective confining stress and hence the shear modulus will vary with depth in a centrifuge model. This results in a change in the propagation velocity of the shear waves as they travel from the base of the container towards the soil surface. This change in the propagation velocity was investigated by performing non-linear finite element analyses using simple single pulse and sinusoidal ground motion as well as more realistic bed rock accelerations. Based on the results from these analyses it was concluded that the variation of shear modulus with effective confining stress results in a reduction in the propagation velocity as the shear waves travel to oil surface. Also the frequency of the input bed rock motion suffers some dispersion.