Quality Control of Non-Woven Geotextiles Used in a Drainage System in an Old Remedial Landfill

摘要

For the past 40 years, non-woven geotextiles have been used as filters and drainage materials in geo-environmental works, especially on sites such as municipal waste landfills. Proper selection of non-woven geotextile filter layers is essential to ensure efficient operation and durability of drainage systems (Koda 2000). Geotextiles are easy to transport and install, their main advantage is to help to minimize clogging effect of drainage. The growing use of geotextiles in environmental projects needs research on performance of geotextiles in leachate collection systems on landfills. It appears that non-woven geotextiles may not drain water as effectively as was initially expected. This paper presents results of laboratory tests of water permeability, in the normal direction to the plane of unworn and worn non-woven geotextile samples taken from the Radiowo landfill after more than 15 years of exploitation. The permeability tests were performed under different loads. The measurements were conducted according to national standards. The aim of the research was to determinate water permeability under various exploitation and loading conditions. The results obtained allowed to trace changes in water permeability of non-woven geotextile samples and to verify the effectiveness of applied geofilters on old municipal-waste landfill conditions.