Strength Envelopes from Single and Multi Geosynthetic Interface Tests

Timothy D Stark, Fawad S. Niazi, Timothy C. Keuscher

Research output: Contribution to journalArticle


This paper presents a comparison of single- and multi-interface strength tests for a proposed landfill liner system configuration. The comparison includes peak and large displacement combination strength envelopes from single- and multi-interface direct shear tests for the same geosynthetic/geosynthetic, geosynthetic clay liner (GCL)/geomembrane, and soil/geosynthetic interfaces. This comparison shows relative agreement between strength envelopes derived from single- and multi-interface tests for the materials tested. Single-interface test results appear to be generally more conservative. Potentially significant differences in the large-displacement strength envelopes were noted that could be a result of the increased strain required to mobilize peak stresses in the multi-interface tests compared to the single-interface tests in combination with the limited maximum displacement allowed by the direct shear testing devices. The test results are also used to illustrate the effect of different soil types and GCL hydration on the peak and large displacement strength envelopes.

Original languageEnglish (US)
Pages (from-to)1351-1367
Number of pages17
JournalGeotechnical and Geological Engineering
Issue number5
StatePublished - Oct 24 2015


  • Direct shear test
  • Geosynthetics design
  • Interface shear resistance
  • Shear strength
  • Slope stability
  • Strength envelope

ASJC Scopus subject areas

  • Architecture
  • Geotechnical Engineering and Engineering Geology
  • Soil Science
  • Geology

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