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Practical guidelines for specifying GCL overlaps. Accounting for shrinkage in the field
Although the shrinkage of unreinforced GCL (geosynthetic clay liner) panels in the field has been managed for many years, the awareness of this panel shrinkage is very recent. In April 2005, the Geosynthetic Institute (GSI) published a white paper that narrowed to three the mechanisms that would lead to gaps on the GCL: 1. Shrinkage accompanied by cyclic wetting and drying. 2. Longitudinal steep-slope tensioning. 3. Contraction on relatively flat surfaces. The recommendations for designers were as follows: 1. Cover exposed GCL installations with at least 12 in. of soil in a timely manner. 2. Do not use GCLs with needle-punched nonwoven geotextiles on both sides unless one of the geotextiles is scrim-reinforced. 3. Increase the GCL overlap to compensate for the potential panel separation: 4. Protect the exposed GM/GCL composite during its exposure time by using insulation techniques. 5. Develop a non-destructive testing method to detect GCL panel separation. 6. Create full-scale field test sites to study the conditions under which GCL panel separation occurs. The following laboratory testing approach is being considered to develop project-specific overlap requirements for GCLs: 1. Select the GCL products to be tested and run separate tests for each product. 2. Determine the maximum time duration that the GCL installation will remain exposed with no soil cover. 3. Estimate the maximum daily temperature that the exposed geomembrane will experience. 4. Estimate the amount of water to add for each cycle. This is the most difficult parameter to estimate.
Practical guidelines for specifying GCL overlaps. Accounting for shrinkage in the field
Although the shrinkage of unreinforced GCL (geosynthetic clay liner) panels in the field has been managed for many years, the awareness of this panel shrinkage is very recent. In April 2005, the Geosynthetic Institute (GSI) published a white paper that narrowed to three the mechanisms that would lead to gaps on the GCL: 1. Shrinkage accompanied by cyclic wetting and drying. 2. Longitudinal steep-slope tensioning. 3. Contraction on relatively flat surfaces. The recommendations for designers were as follows: 1. Cover exposed GCL installations with at least 12 in. of soil in a timely manner. 2. Do not use GCLs with needle-punched nonwoven geotextiles on both sides unless one of the geotextiles is scrim-reinforced. 3. Increase the GCL overlap to compensate for the potential panel separation: 4. Protect the exposed GM/GCL composite during its exposure time by using insulation techniques. 5. Develop a non-destructive testing method to detect GCL panel separation. 6. Create full-scale field test sites to study the conditions under which GCL panel separation occurs. The following laboratory testing approach is being considered to develop project-specific overlap requirements for GCLs: 1. Select the GCL products to be tested and run separate tests for each product. 2. Determine the maximum time duration that the GCL installation will remain exposed with no soil cover. 3. Estimate the maximum daily temperature that the exposed geomembrane will experience. 4. Estimate the amount of water to add for each cycle. This is the most difficult parameter to estimate.
Practical guidelines for specifying GCL overlaps. Accounting for shrinkage in the field
Praktische Richtlinien für die Gestaltung von Überlappungen von Geokunststoff-Tonmatten.Berücksichtigung des Schrumpfs im Feldeinsatz
Thiel, Richard (author) / Criley, Ken (author) / Bryk, Jakub (author)
2005
6 Seiten, 7 Bilder
Article (Journal)
English
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