Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners

Patrick J. Fox, Michael G. Rowland, John R. Scheithe, Kris L. Davis, Murray R. Supple, Charles C. Crow

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A large direct shear machine - called the pullout shear machine - for strength testing of geosynthetic clay liners (GCLs) is described. The machine tests rectangular GCL specimens measuring 406 by 1067 mm. The maximum horizontal displacement is 203 mm, which allows for the measurement of both peak and residual shear strengths. The basic design concept for the pullout shear machine is to shear a GCL specimen between a movable pullout plate and a stationary reaction plate, each covered with an aggressive gripping surface. The advantage of this approach is that large specimens can be sheared under high normal stress with negligible friction. Furthermore, the gripping surfaces and the rigidity of the pullout plate enforce uniform shear strain at failure. The paper describes four main components of the machine: (1) the shearing system, (2) the normal stress and vertical displacement system, (3) the specimen hydration system, and (4) the process control and data acquisition system. In addition, a technique is described for the measurement of internal pore pressures within a GCL specimen during hydration and shear. The performance of the pullout shear machine is illustrated using test data for unreinforced and reinforced geotextile-supported GCLs. Finally, the relative merits of the machine are discussed in comparison to the capabilities of other shear testing apparatus currently available.

Original languageEnglish (US)
Pages (from-to)279-288
Number of pages10
JournalGeotechnical Testing Journal
Volume20
Issue number3
StatePublished - Dec 1 1997

Fingerprint

clay liner
geosynthetics
Clay
Hydration
hydration
Geotextiles
Pore pressure
Shear strain
Testing
Shearing
Rigidity
Shear strength
Process control
Data acquisition
geotextile
shear strain
rigidity
evaluation
Friction
data acquisition

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

Cite this

Fox, P. J., Rowland, M. G., Scheithe, J. R., Davis, K. L., Supple, M. R., & Crow, C. C. (1997). Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners. Geotechnical Testing Journal, 20(3), 279-288.
Fox, Patrick J. ; Rowland, Michael G. ; Scheithe, John R. ; Davis, Kris L. ; Supple, Murray R. ; Crow, Charles C. / Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners. In: Geotechnical Testing Journal. 1997 ; Vol. 20, No. 3. pp. 279-288.
@article{be9769ca6da34de28eae9141c90b2b6b,
title = "Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners",
abstract = "A large direct shear machine - called the pullout shear machine - for strength testing of geosynthetic clay liners (GCLs) is described. The machine tests rectangular GCL specimens measuring 406 by 1067 mm. The maximum horizontal displacement is 203 mm, which allows for the measurement of both peak and residual shear strengths. The basic design concept for the pullout shear machine is to shear a GCL specimen between a movable pullout plate and a stationary reaction plate, each covered with an aggressive gripping surface. The advantage of this approach is that large specimens can be sheared under high normal stress with negligible friction. Furthermore, the gripping surfaces and the rigidity of the pullout plate enforce uniform shear strain at failure. The paper describes four main components of the machine: (1) the shearing system, (2) the normal stress and vertical displacement system, (3) the specimen hydration system, and (4) the process control and data acquisition system. In addition, a technique is described for the measurement of internal pore pressures within a GCL specimen during hydration and shear. The performance of the pullout shear machine is illustrated using test data for unreinforced and reinforced geotextile-supported GCLs. Finally, the relative merits of the machine are discussed in comparison to the capabilities of other shear testing apparatus currently available.",
author = "Fox, {Patrick J.} and Rowland, {Michael G.} and Scheithe, {John R.} and Davis, {Kris L.} and Supple, {Murray R.} and Crow, {Charles C.}",
year = "1997",
month = "12",
day = "1",
language = "English (US)",
volume = "20",
pages = "279--288",
journal = "Geotechnical Testing Journal",
issn = "0149-6115",
publisher = "American Society for Testing and Materials",
number = "3",

}

Fox, PJ, Rowland, MG, Scheithe, JR, Davis, KL, Supple, MR & Crow, CC 1997, 'Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners', Geotechnical Testing Journal, vol. 20, no. 3, pp. 279-288.

Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners. / Fox, Patrick J.; Rowland, Michael G.; Scheithe, John R.; Davis, Kris L.; Supple, Murray R.; Crow, Charles C.

In: Geotechnical Testing Journal, Vol. 20, No. 3, 01.12.1997, p. 279-288.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners

AU - Fox, Patrick J.

AU - Rowland, Michael G.

AU - Scheithe, John R.

AU - Davis, Kris L.

AU - Supple, Murray R.

AU - Crow, Charles C.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - A large direct shear machine - called the pullout shear machine - for strength testing of geosynthetic clay liners (GCLs) is described. The machine tests rectangular GCL specimens measuring 406 by 1067 mm. The maximum horizontal displacement is 203 mm, which allows for the measurement of both peak and residual shear strengths. The basic design concept for the pullout shear machine is to shear a GCL specimen between a movable pullout plate and a stationary reaction plate, each covered with an aggressive gripping surface. The advantage of this approach is that large specimens can be sheared under high normal stress with negligible friction. Furthermore, the gripping surfaces and the rigidity of the pullout plate enforce uniform shear strain at failure. The paper describes four main components of the machine: (1) the shearing system, (2) the normal stress and vertical displacement system, (3) the specimen hydration system, and (4) the process control and data acquisition system. In addition, a technique is described for the measurement of internal pore pressures within a GCL specimen during hydration and shear. The performance of the pullout shear machine is illustrated using test data for unreinforced and reinforced geotextile-supported GCLs. Finally, the relative merits of the machine are discussed in comparison to the capabilities of other shear testing apparatus currently available.

AB - A large direct shear machine - called the pullout shear machine - for strength testing of geosynthetic clay liners (GCLs) is described. The machine tests rectangular GCL specimens measuring 406 by 1067 mm. The maximum horizontal displacement is 203 mm, which allows for the measurement of both peak and residual shear strengths. The basic design concept for the pullout shear machine is to shear a GCL specimen between a movable pullout plate and a stationary reaction plate, each covered with an aggressive gripping surface. The advantage of this approach is that large specimens can be sheared under high normal stress with negligible friction. Furthermore, the gripping surfaces and the rigidity of the pullout plate enforce uniform shear strain at failure. The paper describes four main components of the machine: (1) the shearing system, (2) the normal stress and vertical displacement system, (3) the specimen hydration system, and (4) the process control and data acquisition system. In addition, a technique is described for the measurement of internal pore pressures within a GCL specimen during hydration and shear. The performance of the pullout shear machine is illustrated using test data for unreinforced and reinforced geotextile-supported GCLs. Finally, the relative merits of the machine are discussed in comparison to the capabilities of other shear testing apparatus currently available.

UR - http://www.scopus.com/inward/record.url?scp=0004770049&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0004770049&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0004770049

VL - 20

SP - 279

EP - 288

JO - Geotechnical Testing Journal

JF - Geotechnical Testing Journal

SN - 0149-6115

IS - 3

ER -

Fox PJ, Rowland MG, Scheithe JR, Davis KL, Supple MR, Crow CC. Design and Evaluation of a Large Direct Shear Machine for Geosynthetic Clay Liners. Geotechnical Testing Journal. 1997 Dec 1;20(3):279-288.