Crack formation in clayey geomaterials subjected to tensile (total) stress

I. Murray, A. Tarantino, F. Francescon

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

2 Citations (Scopus)

Abstract

The paper presents an experimental investigation into the mechanisms of tensile failure in clayey geomaterials under saturated and unsaturated conditions. An experimental apparatus was developed to test specimens in uniaxial tension with the facility to monitor suction (pore-water tension) using high-capacity tensiometers. This allowed interpretation of failure data in terms of effective stress and average skeleton stress for saturated and unsaturated specimens respectively. Experimental data from normally consolidated samples showed that failure under uniaxial tension occurs in shear and tensile cracks form as a combination of Mode I and Mode II fracture. In the saturated range when samples were prepared with de-aired water, tensile failure occurred at deviatoric stresses corresponding to the critical state line derived from triaxial and uniaxial compression tests. When using non-de-aired water and at suction levels approaching the air-entry value, failure occurred at deviatoric stresses lower than the ones corresponding to the critical state line derived from compression tests. It has been suggested that water cavitation may be one of the mechanisms that control premature rupture of saturated clay when subjected to a (total) tensile stress state. Finally, tensile failure data from unsaturated samples showed that there is continuity between saturated and unsaturated states.
Original languageEnglish
Title of host publicationUnsaturated Soils
Subtitle of host publicationResearch & Applications
EditorsNasser Khalili, Adrian Russell, Arman Khoshghalb
Place of PublicationLeiden
Pages823-828
Number of pages6
Volume1
Publication statusPublished - 5 Jun 2014
Event6th International Conference on Unsaturated Soils - Sydney, Australia
Duration: 2 Jul 20144 Jul 2014

Conference

Conference6th International Conference on Unsaturated Soils
Abbreviated titleUNSAT 2014
CountryAustralia
CitySydney
Period2/07/144/07/14

Keywords

  • clay
  • tensile failure
  • high capacity tensiometer
  • plastic limit
  • cavitation

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