Comparison of single and multi-layer interface strengths for geosynthetic/geosynthetic and soil/geosynthetic interfaces

Kris Khilnani, Timothy D. Stark, Taj M. Bahadori

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


This paper presents a unique comparison of single and multi-layer interface shear strength tests for a recently constructed landfill liner system. The comparison includes peak and large displacement combination strength envelopes from single- and multi-layer interface direct shear tests for the same geomembrane (GM)/ drainage geocomposite (GC), geosynthetic clay liner (GCL)/geomembrane, and soil/GCL interfaces. This comparison shows excellent agreement between strength envelopes and critical interfaces derived from single- and multi-layer interface tests for the materials tested. Based on this comparison, it is recommended that multi-layer interface tests be used for composite liner system design and if there is an anomaly with the multi-layer interface test results, single interface tests can be conducted to verify the weakest interface and to clarify the test results. Alternatively, the liner system can be designed using single interface tests and multi-layer interface tests can be used to verify the combination strength envelope derived from the single interface tests as was done in this case.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
EditorsThomas L. Brandon, Richard J. Valentine
PublisherAmerican Society of Civil Engineers
Number of pages10
EditionGSP 276
ISBN (Electronic)9780784480434
StatePublished - 2017
EventGeotechnical Frontiers 2017 - Orlando, United States
Duration: Mar 12 2017Mar 15 2017

Publication series

NameGeotechnical Special Publication
NumberGSP 276
ISSN (Print)0895-0563


OtherGeotechnical Frontiers 2017
CountryUnited States

ASJC Scopus subject areas

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

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