Geosynthetic Clay Liner

A geosynthetic clay liner (GCL) is a woven fabric like material primarily used for the lining of landfills

. It is a kind of geomembrane and geosynthetic which incorporates a bentonite or other clay, which has a very low hydraulic conductivity. The resulting lower permeability slows the rate of seepage out of the landfill. Due to environmental laws, any seepage from landfills must be collected and properly disposed of, otherwise contamination of the surrounding ground water could cause major environmental and/or ecological problems. The lower the hydraulic conductivity the more effective the GCL will be at retaining seepage inside of the landfill. Bentonite composed predominantly (>70%) of Montmorillonite or other expansive clays, are preferred and most commonly used in GCLs. A general GCL construction would consist of two layers of geosynthetics stitched together enclosing a layer of processed sodium bentonite. Typically woven and/or non-woven textile geosynthetics are used, however polyethylene or geomembrane layers or geogrid geotextiles materials have also been incorporated into the design or in place of a textile layer to increase strength.GCLs are produced by several large companies in North America, Europe and Asia. The United States Environmental Protection Agency currently regulates landfill construction and design in the US through several legislations.

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Topics in geotechnical engineering

Soils

Clay Silt Sand Gravel Peat Loam

Soil properties

Hydraulic conductivity Water content Void ratio Bulk density Thixotropy Reynolds' dilatancy Angle of repose Cohesion Porosity Permeability Specific storage

Soil mechanics

Effective stress Pore water pressure Shear strength Overburden pressure Consolidation Soil compaction Soil classification Shear wave Lateral earth pressure

Geotechnical investigation

Cone penetration test Standard penetration test Exploration geophysics Monitoring well Borehole

Laboratory tests

Atterberg limits California bearing ratio Direct shear test Hydrometer Proctor compaction test R-value Sieve analysis Triaxial shear test Hydraulic conductivity tests Water content tests

Field tests

Crosshole sonic logging Nuclear Densometer Test

Foundations

Bearing capacity Shallow foundation Deep foundation Dynamic load testing Wave equation analysis

Retaining walls

Mechanically stabilized earth Soil nailing Tieback Gabion Slurry wall

Slope stability

Mass wasting Landslide Slope stability analysis

Earthquakes

Soil liquefaction Response spectrum Seismic hazard Ground-structure interaction

Geosynthetics

Geotextile Geomembranes Geosynthetic clay liner Cellular confinement

Instrumentation for Stability Monitoring

Deformation monitoring Automated Deformation Monitoring

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Categories: Geotechnical engineering | Landfill | Waste stubsHidden categories: Articles lacking sources from December 2009 | All articles lacking sources

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