Large dynamic direct shear machine for geosynthetic clay liners

Patrick J. Fox, Christopher J. Nye, Todd C. Morrison, Jay G. Hunter, James T. Olsta

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A large direct shear machine for static and dynamic shear strength testing of geosynthetic clay liners (GCLs) and GCL liner systems is described. The machine tests rectangular GCL specimens measuring 305 × 1067 mm and has a maximum shear displacement of 254 mm, which is sufficiently large to allow for the measurement of residual or near-residual shear strengths in most cases. The basic design concept for the device is to shear a GCL specimen between a bidirectional pullout plate and a stationary reaction plate, each covered with an aggressive gripping surface. The pullout plate is driven by a computer-controlled hydraulic actuator. The maximum normal stress is 2000 kPa, the maximum shear stress is 750 kPa, and the shearing system is capable of imposing general stress-controlled or displacement-controlled dynamic loading to a test specimen. The actuator has a maximum frequency of 4 Hz for sinusoidal loading with a displacement amplitude of 25 mm. The maximum displacement rate for burst loading (i.e., single thrust) at zero force is 1 m/s. The paper describes four main components of the machine: (1) the shearing system; (2) the normal stress and vertical displacement measurement system; (3) the specimen hydration system; and (4) the process control and data acquisition system. The performance of the machine is illustrated using displacement-controlled test data for the static and cyclic internal shear strength of a hydrated needle-punched GCL.

Original languageEnglish (US)
Pages (from-to)392-400
Number of pages9
JournalGeotechnical Testing Journal
Volume29
Issue number5
StatePublished - Sep 1 2006

Fingerprint

clay liner
geosynthetics
Clay
Shear strength
shear strength
Shearing
Hydraulic actuators
Displacement measurement
Hydration
Needles
Process control
Shear stress
liner
Data acquisition
hydration
Actuators
data acquisition
shear stress
thrust
hydraulics

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

Cite this

Fox, P. J., Nye, C. J., Morrison, T. C., Hunter, J. G., & Olsta, J. T. (2006). Large dynamic direct shear machine for geosynthetic clay liners. Geotechnical Testing Journal, 29(5), 392-400.
Fox, Patrick J. ; Nye, Christopher J. ; Morrison, Todd C. ; Hunter, Jay G. ; Olsta, James T. / Large dynamic direct shear machine for geosynthetic clay liners. In: Geotechnical Testing Journal. 2006 ; Vol. 29, No. 5. pp. 392-400.
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Fox, PJ, Nye, CJ, Morrison, TC, Hunter, JG & Olsta, JT 2006, 'Large dynamic direct shear machine for geosynthetic clay liners', Geotechnical Testing Journal, vol. 29, no. 5, pp. 392-400.

Large dynamic direct shear machine for geosynthetic clay liners. / Fox, Patrick J.; Nye, Christopher J.; Morrison, Todd C.; Hunter, Jay G.; Olsta, James T.

In: Geotechnical Testing Journal, Vol. 29, No. 5, 01.09.2006, p. 392-400.

Research output: Contribution to journalArticle

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Fox PJ, Nye CJ, Morrison TC, Hunter JG, Olsta JT. Large dynamic direct shear machine for geosynthetic clay liners. Geotechnical Testing Journal. 2006 Sep 1;29(5):392-400.