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Sliding stability for landfills, heap leach pads and caps constructed using geosynthetics is of critical importance for both short and long term performance of these facilities. For layered facilities, instability along critical slip planes must be considered for construction and operation of the facility.
The direct shear friction test, now being developed under ASTM D35, is the test used to generate important performance data for use in stability determinations.
This paper addresses the main elements of direct shear friction testing and analysis including discussions on the required test apparatus, specimen preparation and soil placement. Differences in testing geosynthetics in contact with other geosynthetics or soils are highlighted. Sources of potential bias in test data are discussed along with recommended solutions. Interpretation of direct shear friction data for use in performance evaluation is included.
geosynthetics, geosynthetics testing, direct shear testing, interface shear resistance, waste facility design
Geosynthetics Services Manager, Geotechnical Services, Inc., Cincinnati, Ohio