Interface shear testing of GCL liner systems for very high normal stress conditions

Stuart S. Thielmann, Patrick J. Fox, Chris Athanassopoulos

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

5 Scopus citations

Abstract

Geosynthetics, in particular geomembranes (GMs) and geosynthetic clay liners (GCLs), are seeing increased usage in mining applications such as tailings impoundments and heap leach pads. These applications can involve extreme conditions. For instance, heaps can now exceed 200 m in height and impose normal stresses approaching 4 MPa on a leach pad liner system. Such loads exceed the limits of most standard laboratory testing devices, making it difficult to properly evaluate the behavior of geosynthetic materials for these applications. Direct shear testing of geosynthetics is typically limited to normal stresses less than 690 kPa, which falls far short of the loads expected in many heap leach pads and high solid waste landfills. To address this need, two series of interface shear tests between textured GMs and needle-punched GCLs were performed at normal stresses ranging from 348 to 4146 kPa. The first testing series measured the individual interface shear strengths by using a rigid backing plate on both sides of the liner system. For the second series of tests, soil layers were added to allow more realistic out-of-plane deformations of the geomembrane. Results indicate that the effect of local GM deformations is to modestly increase the peak shear strength and dramatically increase the residual shear strength of the GM/GCL interface.

Original languageEnglish (US)
Title of host publicationGeoCongress 2013
Subtitle of host publicationStability and Performance of Slopes and Embankments III - Proceedings of the 2013 Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Pages63-71
Number of pages9
Edition231 GSP
ISBN (Print)9780784412787
DOIs
StatePublished - 2013
Event2013 Congress on Stability and Performance of Slopes and Embankments III, Geo-Congress 2013 - San Diego, CA, United States
Duration: Mar 3 2013Mar 7 2013

Publication series

NameGeotechnical Special Publication
Number231 GSP
ISSN (Print)0895-0563

Other

Other2013 Congress on Stability and Performance of Slopes and Embankments III, Geo-Congress 2013
CountryUnited States
CitySan Diego, CA
Period3/3/133/7/13

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Interface shear testing of GCL liner systems for very high normal stress conditions'. Together they form a unique fingerprint.

Cite this