Experimental Study of Shear Strength of Geosynthetic Clay Liner for Monotonic Loading
Internal shear strength of geosynthetic clay liner (GCL) is of vital importance for the stability of waste containment facilities where GCLs are widely used as hydraulic barriers. This paper presents an experimental investigation of the internal shear strength of hydrated needle-punched geosynthetic clay liners (NP GCLs) under monotonic loading. A new dynamic direct shear apparatus with the capability to cover a large range of normal stress and displacement rate is developed. Series of direct shear tests on NP GCL for different normal stress levels and displacement rates are performed. The failure mechanism of hydrated GCL is explored through inspection of tested specimens and analysis of test results. The intrinsic relationship between peak/residual shear strength of NP GCL and displacement rate is also studied. Experimental results indicated that displacement rate has obvious effect on the peak shear strength of NP GCL, while the influence of displacement rate on residual shear strength is of little significance for the same normal stress level.
KeywordsGeosynthetic clay liner Direct shear test Shear strength Landfill
- Daniel DE, Shan HY, Anderson JD (1993) Effects of partial wetting on the performance of the bentonite component of a geosynthetic clay liner. In: Proceedings of the geosynthetics, Vancouver, Canada, vol 3, pp 1483–1496. Industrial Fabrics Association International, RosevilleGoogle Scholar
- Kavazanjian E, Arab M, Matasovic N (2013) Performance of two geosynthetics-lined landfills in the northridge earthquake. In: 7th international conference on case histories in geotechnical engineering, ChicagoGoogle Scholar
- McCartney JS, Zornberg JG, Swan RH (2002) Internal and interface shear strength of geosynthetic clay liners (GCLs). Geotechnical Research Rep., Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado, Boulder, CO, 450Google Scholar