Static shear strength of geosynthetic clay liners

Chris Athanassopoulos, Patrick Joseph Fox

Research output: Contribution to specialist publicationArticle

Abstract

The focus is hydrated needlepunch-reinforced GCLs and their interface with textured high-density polyethylene geomembranes. Hydrated sodium bentonite has very low shear strength. Reinforced GCLs can be manufactured as needlepunched or stitch-bonded. Needlepunching is now the preferred method and involves the use of barbed needles to pull nonwoven fibers from one geotextile through the bentonite core and the opposite geotextile. Peak interface strengths for a GMX placed against the nonwoven side of a NP GCL are higher than those for the woven side due to extrusion of hydrated bentonite through the woven geotextile. The variability of normal stress at failure mode transition highlight the need for project-specific shear tests using representative materials and conditions. Observations of internal shear failure of NP GCLs are thus far limited to the laboratory because there are no known cases of internal shear failure of NP GCLs in the field.

Original languageEnglish (US)
Pages44-50
Number of pages7
Volume31
No1
Specialist publicationGeotechnical Fabrics Report
StatePublished - Feb 2013

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Polymers and Plastics

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