Strain softening constitutive model for the internal shear behavior of a Geosynthetic clay liner

Mohamed G. Arab, Edward Kavazanjian, Patrick J. Fox, Joseph M. Sura, Chris Nye

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

A strain-softening constitutive model has been developed to model the internal shear load-deformation behavior of a hydrated, nonwoven fabric encapsulated and needlepunch reinforced geosynthetic clay liner (GCL) for use in performance-based design of geosynthetic barriers for waste containment. The softening formulation is based on a multiple yield surface model that employs an isotropic softening yield surface and a perfectly plastic yield surface to characterize post-peak strain softening and subsequent perfectly plastic behavior of geomaterials in a numerically stable manner. Model parameters are developed based on the results of large scale shear tests on GCL samples. The constitutive model has been implemented in a finite-difference software package for solution of geotechnical boundary value problems. The numerical implementation of the constitutive model compares well with the experimental data for uniform cyclic loading, capturing the unusual shape of pre-peak strength hysteresis loops and the softening in shear strength of the GCL beyond the peak shear strength. However, the model does not model the gradual cyclic degradation beyond the first or second cycle of loading and data is needed to test the performance of the model for non-uniform cyclic loading. The model applicable to both static and cyclic loading and can be used to model the performance of liner and cover systems that employ GCLs and are subject to waste settlement and seismic loading.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
Pages291-306
Number of pages16
Edition230
StatePublished - 2013

Fingerprint

clay liner
geosynthetics
Constitutive models
softening
Clay
cyclic loading
Shear strength
Plastics
shear strength
Nonwoven fabrics
plastic
Hysteresis loops
Software packages
Boundary value problems
shear test
containment
liner
hysteresis
Degradation

ASJC Scopus subject areas

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

Cite this

Arab, M. G., Kavazanjian, E., Fox, P. J., Sura, J. M., & Nye, C. (2013). Strain softening constitutive model for the internal shear behavior of a Geosynthetic clay liner. In Geotechnical Special Publication (230 ed., pp. 291-306)

Strain softening constitutive model for the internal shear behavior of a Geosynthetic clay liner. / Arab, Mohamed G.; Kavazanjian, Edward; Fox, Patrick J.; Sura, Joseph M.; Nye, Chris.

Geotechnical Special Publication. 230. ed. 2013. p. 291-306.

Research output: Chapter in Book/Report/Conference proceedingChapter

Arab, MG, Kavazanjian, E, Fox, PJ, Sura, JM & Nye, C 2013, Strain softening constitutive model for the internal shear behavior of a Geosynthetic clay liner. in Geotechnical Special Publication. 230 edn, pp. 291-306.
Arab MG, Kavazanjian E, Fox PJ, Sura JM, Nye C. Strain softening constitutive model for the internal shear behavior of a Geosynthetic clay liner. In Geotechnical Special Publication. 230 ed. 2013. p. 291-306
Arab, Mohamed G. ; Kavazanjian, Edward ; Fox, Patrick J. ; Sura, Joseph M. ; Nye, Chris. / Strain softening constitutive model for the internal shear behavior of a Geosynthetic clay liner. Geotechnical Special Publication. 230. ed. 2013. pp. 291-306
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