Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Destructive and Nondestructive Testing of Geosynthetic Clay Liner (GCL) Panel Seams
Geosynthetic clay liner (GCL) panel separation of the overlapping edges has occurred in five known situations when they have been placed beneath geomembranes exposed to the atmosphere. Exposure time varied from 15 mos.-to-5 years and the separation distances varied from loss of overlap to as much as 1.2 m. Of course, any amount of physical separation challenges the concept of a composite liner and should be avoided. The current thinking to prevent panel separation when exposed conditions are necessary is a mechanical bonding (or "seaming") of the initial overlaps. This paper will first address manufacturing of seven different seaming types, aka, procedures. It then introduces seam strength testing methods for GCL seams. The testing methods described herein can be conducted in the laboratory as destructive tests and/or in the field as nondestructive tests. Both types can be conducted on GCL seams irrespective of how the seams were made in the field. The destructive test method is used to determine the ultimate tensile strength of the GCL seams. It is straightforward and follows similar procedures of geomembrane seam testing in shear. Results can then be compared to the unseamed GCL's wide width tensile test results and thus a seam efficiency can be calculated. In determining the in-situ GCL seam strength, numerous trials in gripping and evaluating representative samples of different thickness, geometry, and stiffness were performed. The resulting recommended field test places the GCL seam in a shear mode such that the applied force is less than the ultimate strength in a manner similar to conventional nondestructive geomembrane testing.
Destructive and Nondestructive Testing of Geosynthetic Clay Liner (GCL) Panel Seams
Geosynthetic clay liner (GCL) panel separation of the overlapping edges has occurred in five known situations when they have been placed beneath geomembranes exposed to the atmosphere. Exposure time varied from 15 mos.-to-5 years and the separation distances varied from loss of overlap to as much as 1.2 m. Of course, any amount of physical separation challenges the concept of a composite liner and should be avoided. The current thinking to prevent panel separation when exposed conditions are necessary is a mechanical bonding (or "seaming") of the initial overlaps. This paper will first address manufacturing of seven different seaming types, aka, procedures. It then introduces seam strength testing methods for GCL seams. The testing methods described herein can be conducted in the laboratory as destructive tests and/or in the field as nondestructive tests. Both types can be conducted on GCL seams irrespective of how the seams were made in the field. The destructive test method is used to determine the ultimate tensile strength of the GCL seams. It is straightforward and follows similar procedures of geomembrane seam testing in shear. Results can then be compared to the unseamed GCL's wide width tensile test results and thus a seam efficiency can be calculated. In determining the in-situ GCL seam strength, numerous trials in gripping and evaluating representative samples of different thickness, geometry, and stiffness were performed. The resulting recommended field test places the GCL seam in a shear mode such that the applied force is less than the ultimate strength in a manner similar to conventional nondestructive geomembrane testing.
Destructive and Nondestructive Testing of Geosynthetic Clay Liner (GCL) Panel Seams
Koerner, George R. (Autor:in) / Koerner, Robert M. (Autor:in)
2015
12 Seiten, Bilder, Tabellen, Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
| NTIS | 1998
| NTIS | 1998
| British Library Online Contents | 2016