Location

St. Louis, Missouri

Session Start Date

4-2-1995

Session End Date

4-7-1995

Abstract

Rotational shear is a class of loading under which the second invariant of the deviatoric stress tensor, J, is kept constant during shear. A limited number of undrained tests on saturated loose sand have shown that rotational shear yields more pore pressure than other shear paths of the same J magnitude. By intuition, this experimental finding seems to suggest that soil subjected to multi-directional earthquake loading, which bears the characteristics of the rotational shear, has lower liquefaction resistance than that under unidirectional shaking. However, in contrast to intuition, a preliminary but careful examination of the field stress and boundary conditions indicates that rotation shear seems to have very little impact on the seismic response of natural soil deposits. This paper presents the theoretical evidence that supports the preliminary conclusion.

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

The Role of Rotational Shear in Site Response Analyses

St. Louis, Missouri

Rotational shear is a class of loading under which the second invariant of the deviatoric stress tensor, J, is kept constant during shear. A limited number of undrained tests on saturated loose sand have shown that rotational shear yields more pore pressure than other shear paths of the same J magnitude. By intuition, this experimental finding seems to suggest that soil subjected to multi-directional earthquake loading, which bears the characteristics of the rotational shear, has lower liquefaction resistance than that under unidirectional shaking. However, in contrast to intuition, a preliminary but careful examination of the field stress and boundary conditions indicates that rotation shear seems to have very little impact on the seismic response of natural soil deposits. This paper presents the theoretical evidence that supports the preliminary conclusion.