Eileen D. Gilligan, Samuel P. Clemence

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Interactions between clay particles and organic pore fluids occur frequently in chemical waste disposal site environments. Laboratory experiments have identified the formation of clay tactoids in organic-saturated clay materials. At low pressures, tactoids impart granular fabrics and corresponding granular geotechnical behaviors to clays. As pressures increase, tactoidal clay materials pass through several unique stages of deformation: dilatant stage, pore space compression stage, tactoid breakage stage, and individual particle behavior stage. The response of a tactoidal clay to stress is dependent upon clay mineralogy and pore fluid chemistry; each stage of deformation for several organic fluid/clay mineral combinations has been quantified by compressibility, void ratio, and permeability measurements. Scanning electron microscopic examination of stressed samples confirms this multistage behavior. The occurrence of tactoids imparts a more open fabric to clay materials, resulting in increased permeability and greater friction angle.

Original languageEnglish (US)
Pages (from-to)515-529
Number of pages15
JournalBulletin of the Association of Engineering Geologists
Issue number4
StatePublished - Jan 1 1984

ASJC Scopus subject areas

  • Environmental Science(all)
  • Engineering(all)
  • Earth and Planetary Sciences(all)

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