Long-term shear strength behavior of a needlepunched geosynthetic clay liner

Conference · Sat Nov 01 04:00:00 EST 1997

OSTI ID:543566

Trauger, R J ^[1]; Swan, Jr, R H; Yuan, Z ^[2]

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1. Colloid Environmental Technologies Co., Arlington Heights, IL (United States)
2. GeoSyntec Consultants, Atlanta, GA (United States). Soil-Geosynthetic Interaction Testing Lab.

This paper describes two large-scale constant-load (creep) shear testing devices that were developed to evaluate the long-term shearing behavior of geosynthetic clay liners (GCLs) and interfaces between GCLs and other geosynthetics or soils. One device was designed to simulate loading conditions that typically occur on a GCL deployed in a landfill cover system. The other device was designed to simulate loading conditions that typically occur on a GCL deployed in a landfill lining system. A needlepunched GCL was selected for evaluation of its long-term shearing behavior under these two types of loading conditions and the test results are presented in terms of time-displacement curves and shear rate-displacement curves. The results to date show that the GCL has undergone relatively small shear displacements and that the shear displacement rates within the GCL and/or at the test interface have been continuously decreasing with time. For the conditions used in this testing program, it is believed that the GCL`s behavior can be considered stable. Further testing is planned to more accurately define the time-dependent internal and interface shear behavior of the GCL.

• OSTI ID: 543566
• Report Number(s): CONF-9601137--; ISBN 0-8031-2471-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
BENTONITE
CREEP
INTERFACES
LINERS
MEASURING METHODS
PERFORMANCE TESTING
SANITARY LANDFILLS
SHEAR PROPERTIES
TEST FACILITIES