Dynamic shear strength of a needle-punched GCL for monotonic loading

Patrick J. Fox, Joseph M. Sura, Christopher J. Nye

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This paper presents an experimental investigation of the dynamic internal shear strength of a hydrated woven/nonwoven needlepunched geosynthetic clay liner (GCL) for monotonic (i.e., single direction) loading conditions. Displacement-controlled shear tests were conducted using a large direct shear machine for four normal stress levels ranging from 141 to 1,382 kPa and seven shear displacement rates R ranging from 0.1 to 30,000 mm=min. For each normal stress, peak shear strength first increased and then decreased with increasing displacement rate. Maximum values of peak strength occurred for R = 100-10,000 mm=min and were 16-23% higher than corresponding static values measured at R = 0.1 mm=min. For each normal stress, residual shear strength first decreased and then increased with increasing displacement rate, with minimum values occurring at R = 1 mm=min. On a relative basis, residual strengths show greater dependence on displacement rate than peak strengths. The standard displacement rate for static shear tests of hydrated GCLs (0.1 mm=min) generally yielded conservative values of peak shear strength but unconservative values of residual shear strength, especially for higher normal stress levels. The GCL experienced large post-peak strength reduction for all test conditions.

Original languageEnglish (US)
Article number04015025
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume141
Issue number7
DOIs
StatePublished - Jul 1 2015

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clay liner
geosynthetics
Shear strength
Needles
shear strength
Clay
shear test
residual stress
residual strength
Residual stresses
rate

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Environmental Science(all)

Cite this

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title = "Dynamic shear strength of a needle-punched GCL for monotonic loading",
abstract = "This paper presents an experimental investigation of the dynamic internal shear strength of a hydrated woven/nonwoven needlepunched geosynthetic clay liner (GCL) for monotonic (i.e., single direction) loading conditions. Displacement-controlled shear tests were conducted using a large direct shear machine for four normal stress levels ranging from 141 to 1,382 kPa and seven shear displacement rates R ranging from 0.1 to 30,000 mm=min. For each normal stress, peak shear strength first increased and then decreased with increasing displacement rate. Maximum values of peak strength occurred for R = 100-10,000 mm=min and were 16-23{\%} higher than corresponding static values measured at R = 0.1 mm=min. For each normal stress, residual shear strength first decreased and then increased with increasing displacement rate, with minimum values occurring at R = 1 mm=min. On a relative basis, residual strengths show greater dependence on displacement rate than peak strengths. The standard displacement rate for static shear tests of hydrated GCLs (0.1 mm=min) generally yielded conservative values of peak shear strength but unconservative values of residual shear strength, especially for higher normal stress levels. The GCL experienced large post-peak strength reduction for all test conditions.",
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Dynamic shear strength of a needle-punched GCL for monotonic loading. / Fox, Patrick J.; Sura, Joseph M.; Nye, Christopher J.

In: Journal of Geotechnical and Geoenvironmental Engineering, Vol. 141, No. 7, 04015025, 01.07.2015.

Research output: Contribution to journalArticle

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