Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

Electrical polarizations were observed in common fine soil aggregates in shear deformation tests and simulations conducted in a laboratory. This electric potential is called Shear-induced Potential (SIP). The SIP can be interpreted as the physicochemical interaction between the surface of clay particles and interstitial water by the kinetics of the electric double layer. The SIP could not be detected in a remolded craft clay sample, which was possibly treated with electrically non-dipole oil. In the laboratory, a plane strain test under the un-drained condition was carried out to reveal the characteristics of the polarization accompanying the shear deformation. Gouges from the active faults were remolded with saline water and consolidated axially under the condition of K0 as the test specimen. The polarities of the electric charges induced at the surfaces of the specimens were positive, neutral and negative for the maximum (tensional), intermediate and minimum principal strain axial planes, respectively. In addition, in-situ observations of the spontaneous potential (SP) were performed at gravitationally unstable sites to verify the results obtained in the laboratory. The characteristic distributions of the charge and time variation of SP were consistent with the pattern observed by the scaled model experiments in the laboratory.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Characterization of the Shear-Induced Potential (SIP) in Clay and the Application to Landslide Sites

Arlington, Virginia

Electrical polarizations were observed in common fine soil aggregates in shear deformation tests and simulations conducted in a laboratory. This electric potential is called Shear-induced Potential (SIP). The SIP can be interpreted as the physicochemical interaction between the surface of clay particles and interstitial water by the kinetics of the electric double layer. The SIP could not be detected in a remolded craft clay sample, which was possibly treated with electrically non-dipole oil. In the laboratory, a plane strain test under the un-drained condition was carried out to reveal the characteristics of the polarization accompanying the shear deformation. Gouges from the active faults were remolded with saline water and consolidated axially under the condition of K0 as the test specimen. The polarities of the electric charges induced at the surfaces of the specimens were positive, neutral and negative for the maximum (tensional), intermediate and minimum principal strain axial planes, respectively. In addition, in-situ observations of the spontaneous potential (SP) were performed at gravitationally unstable sites to verify the results obtained in the laboratory. The characteristic distributions of the charge and time variation of SP were consistent with the pattern observed by the scaled model experiments in the laboratory.