A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Needles in nonwoven geotextiles - a landfill case history
During the deployment of a composite liner system at the Yolo County Central Landfill near Davis, California (USA), a large number of broken needles were found in the filter geotextile. Over the course of the project, testing was conducted to determine the effect of the needles on the integrity of the system. The evaluation included large scale hydrostatic puncture testing based on GRI Test Method GM3 and leakage rate calculations from potential punctures in the geomembrane. From this information, procedures were developed to inspect the on-site rolls of geotextile and determine the acceptability of the fabric. Based on the extensive puncture testing conducted on samples of the geotextile containing needle fragments, it was determined that the potential exists for needles present in a geotextile to puncture an underlying geomembrane. While the leakage rate through the punctures will be minimal, it does represent an increase over and above the standard leakage rate from a 1-cm diameter hole that would be expected from a well-constructed composite liner system (U.S. EPA 1987, 1992). High groundwater levels (within 1.5 meters of the ground surface) at the Yolo County site also required any leakage to be seriously considered. After evaluating the amount of potential leachate that could be generated along with other site specific factors at the landfill, it was determined that the composite liner system in-place would adequately protect the waters of the State. This information was presented to the regulatory agencies and the facility was permitted to accept refuse.
Needles in nonwoven geotextiles - a landfill case history
During the deployment of a composite liner system at the Yolo County Central Landfill near Davis, California (USA), a large number of broken needles were found in the filter geotextile. Over the course of the project, testing was conducted to determine the effect of the needles on the integrity of the system. The evaluation included large scale hydrostatic puncture testing based on GRI Test Method GM3 and leakage rate calculations from potential punctures in the geomembrane. From this information, procedures were developed to inspect the on-site rolls of geotextile and determine the acceptability of the fabric. Based on the extensive puncture testing conducted on samples of the geotextile containing needle fragments, it was determined that the potential exists for needles present in a geotextile to puncture an underlying geomembrane. While the leakage rate through the punctures will be minimal, it does represent an increase over and above the standard leakage rate from a 1-cm diameter hole that would be expected from a well-constructed composite liner system (U.S. EPA 1987, 1992). High groundwater levels (within 1.5 meters of the ground surface) at the Yolo County site also required any leakage to be seriously considered. After evaluating the amount of potential leachate that could be generated along with other site specific factors at the landfill, it was determined that the composite liner system in-place would adequately protect the waters of the State. This information was presented to the regulatory agencies and the facility was permitted to accept refuse.
Needles in nonwoven geotextiles - a landfill case history
Nadeln in Geotextil-Vliesstoffen - Fallbericht aus einer Mülldeponie
Purdy, S. (author) / Yazdani, R. (author)
1999
11 Seiten, 1 Bild, 1 Tabelle, 3 Quellen
Conference paper
English
Needles in Nonwoven Geotextiles - A Landfill Case History
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