Effect of bentonite migration in geosynthetic clay liners on contaminant transport

T. D. Stark, H. Choi, R. Akhtarshad

Research output: Contribution to journalConference article

Abstract

Since the introduction of geosynthetic clay liners (GCLs) to waste containment facilities, one of the major concerns about their use has been the hydraulic equivalency to a compacted clay liner as required by regulations. Laboratory test results and more recently field observations show that the thickness, or mass per unit area, of hydrated bentonite in a GCL can decrease under normal stress, especially around zones of stress concentration or nonuniform stresses, such as a rock or roughness in the subgrade, a leachate sump, or wrinkles in an overlying geomembrane. This paper describes the effect of bentonite migration on the hydraulic equivalence between a GCL and GCL and the contaminant transport through a thinned GCL. Finally, the paper presents suggestions for protecting hydrated bentonite from stress concentrations and reducing contaminant transport through a GCL.

Original languageEnglish
Pages (from-to)3233-3247
Number of pages15
JournalGeotechnical Special Publication
Issue number130-142
Publication statusPublished - 2005
Externally publishedYes
EventGeo-Frontiers 2005 - Austin, TX, United States
Duration: 2005 Jan 242005 Jan 26

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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