STP1308: Short-Term and Creep Shear Characteristics of a Needlepunched Thermally Locked Geosynthetic Clay Liner

    Siebken, JR
    Supervisor of Technical Services, National Seal Company, Galesburg, IL

    Swan, RH
    Laboratory Manager and Assistant Program Manager, GeoSyntec Consultants, Soil-Geosynthetic Interaction Testing Laboratory, Atlanta, GA

    Yuan, Z
    Laboratory Manager and Assistant Program Manager, GeoSyntec Consultants, Soil-Geosynthetic Interaction Testing Laboratory, Atlanta, GA

    Pages: 14    Published: Jan 1997


    Abstract

    A series of constant-rate direct shear tests were conducted on a needlepunched thermally locked geosynthetic clay liner (GCL) in accordance with ASTM Test Method for Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method (D 5321). The test results demonstrate that the needlepunched thermally locked reinforcing fibers provide substantial short-term shear strength to a GCL. However, there is a growing concern that the long-term shear strength of this type of GCL can be affected due to the potential of creep within the reinforcing fibers under sustained constant loads which occur in the field. An attempt was made to address this concern through an incrementally-loaded creep shear test conducted in a newly developed constant-load (creep) shear testing device. The results of the creep shear test to date show that the GCL has undergone relatively small shear displacements with incremental shear rates decreasing with time within each loading phase.

    Keywords:

    geosynthetic clay liner, shear strength, creep shear, direct shear, needle-punched, thermally locked, reinforced


    Paper ID: STP11796S

    Committee/Subcommittee: D35.04

    DOI: 10.1520/STP11796S


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