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Internal and Interface Shear Strength of Geosynthetic Clay Liners

Participants: John McCartney

Description: A database of 375 large-scale direct shear tests was assembled in this investigation to identify and quantify the variables governing the internal shear strength of geosynthetic clay liners (GCLs). Analysis of the database allows a thorough investigation of the effect of reinforcement, conditioning of specimens and normal stress during shearing on internal shear strength, and of sources of internal shear strength variability. The investigation benefited from test results obtained for a wide range of GCL types (unreinforced, needle-punched, thermal-bonded and stitch-bonded), normal stresses (from 2.4 kPa to 2759 kPa), and shear displacement rates (testing duration from 1.25 hs to 35 days).

References:

McCartney, J.S., Zornberg, J.G., and Swan, R. (2002). Internal and Interface Shear Strength of Geosynthetic Clay Liners (GCLs): Additional Data. Geotechnical Research Report, Department of Civil, Environmental and Architectural Engineering, University of Texas at Austin , August 2002, 26 p.

McCartney, J.S., Zornberg, J.G., and Swan, R. (2002). Internal and Interface Shear Strength of Geosynthetic Clay Liners (GCLs). Geotechnical Research Report, Department of Civil, Environmental and Architectural Engineering, University of Colorado at Boulder , May 2002, 386 p.

McCartney, J.S. (2002). Internal and Interface Shear Strength of Geosynthetic Clay Liners. M.S. thesis, Department of Civil Environmental and Architectural Engineering, University of Colorado at Boulder, Boulder, Colorado, April 2002, 419 p.

McCartney, J.S. Zornberg, J.G., Swan, Jr., R.H., and Gilbert, R.B. (2004). “Reliability-Based Stability Analysis Considering GCL Shear Strength Variability.” Geosynthetics International. 11(3)212-232.

Zornberg, J.G. McCartney, J.S. and Swan, Jr., R.H. (2005). “Analysis of a Large Database of GCL Internal Shear Strength Results.” Journal of Geotechnical and Geoenvironmental Engineering. 131(3)1-14.

McCartney, J.S. and Zornberg, J.G. (2003). “Characterization of GCL Shear Strength Variability.” 56th Annual Canadian Geotechnical Conference and 4th IAH-CNC Joint Conference. September 29-October 1, 2003 Winnipeg, Canada.

McCartney, J.S. and Zornberg, J.G. (2004). “Effect of Specimen Conditioning on GCL Shear Strength.” GeoAsia 2004: 3rd Asian Regional Conference on Geosynthetics. Eds. Shim, J.G., Yoo, C., and Jeon, H-Y. Seoul, Korea. pp. 631-643

McCartney, J.S. and Zornberg, J.G. (2005). ‘Effect of Geomembrane Texturing on Geosynthetic Clay Liner - Geomembrane Interface Shear Strength.” ASCE GeoFrontiers 2005. Austin, TX January 27-29, 2005.

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