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Dynamic Shear Strength of a Needle-Punched GCL for Monotonic Loading
AbstractThis paper presents an experimental investigation of the dynamic internal shear strength of a hydrated woven/nonwoven needle-punched 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.
Dynamic Shear Strength of a Needle-Punched GCL for Monotonic Loading
AbstractThis paper presents an experimental investigation of the dynamic internal shear strength of a hydrated woven/nonwoven needle-punched 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.
Dynamic Shear Strength of a Needle-Punched GCL for Monotonic Loading
Fox, Patrick J (author) / Nye, Christopher J / Sura, Joseph M
2015
Article (Journal)
English
BKL:
56.20
Ingenieurgeologie, Bodenmechanik
Dynamic Shear Strength of a Needle-Punched GCL for Monotonic Loading
| British Library Online Contents | 2015
Dynamic Shear Behavior of a Needle-Punched Geosynthetic Clay Liner
| Online Contents | 2007