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Influence of secondary compression on undrained strength of soft kaolinites

Rao, Sudhakar M and Deepak, G B (2018) Influence of secondary compression on undrained strength of soft kaolinites. In: MARINE GEORESOURCES & GEOTECHNOLOGY, 36 (2). pp. 173-180.

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Official URL: http://dx.doi.org/10.1080/1064119X.2017.1285380

Abstract

Soft kaolinite deposits of marine origin are encountered as foundation soils in many parts of the world. The well-developed flocculated structure of kaolinite-bearing marine deposits is amenable to alterations from leaching of pore solution salts, loss of overburden, and secondary compression. Secondary compression causes densification of microstructure that may impact the viscous resistance, soil stiffness, and undrained shear strength of kaolinite-bearing marine deposits. This study examines the influence of secondary compression on viscous resistance and constrained stress-strain modulus of soft kaolinites prepared in synthetic seawater and sodium chloride solutions. The impact of secondary compression on undrained shear strength is interpreted from changes in microstructure, percent monovalent cation concentration, viscous resistance, and constrained stress-strain modulus. Kaolinite specimens experience reduction in void space during secondary compression. Breakdown of edge-face (E-F) and edge-edge (E-E) contacts of kaolinite particles during secondary compression and creation of interlocking zones is observed from scanning electron micrograph studies. Breakdown of E-F and E-E contacts is considered responsible for reduction in constrained stress-strain modulus during secondary compression. Concomitant, creation of interlocking zones at particle contacts increases the viscous resistance of microstructure that enhances the undrained shear strength of soft kaolinites.

Item Type: Journal Article
Additional Information: COpy right for this article belong to the TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Id for Latest eprints
Date Deposited: 02 Mar 2018 14:58
Last Modified: 02 Mar 2018 14:58
URI: http://eprints.iisc.ac.in/id/eprint/58961

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