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Evaluations of engineered cover systems for mine waste rock and tailings
June 1st, 2013
Geosynthetics for mining waste rock and tailings. By Mark E. Smith and Christos Athanassopoulos Introduction Waste rock dumps and tailings impoundments are common features at mine sites. Many of these waste disposal facilities contain sulfide-rich minerals that generate acid mine drainage (AMD) when they oxidize in the presence of oxygen and water. Control of AMD […]
Sustainable geomembrane recycling and downcycling
June 1st, 2013
Shale oil and gas open sustainability opportunities. By Timothy D. Stark, Jennifer Miller, David LaFiura, and Scott Fought Introduction Pennsylvania’s Department of Environmental Protection (DEP) and Department of Community and Economic Development (DCED) officials have welcomed the recent emersion of companies that collect and reprocess geomembranes used in various aspects of Marcellus Shale oil and […]
Onward with a few bumps
June 1st, 2013
1995 GFR covers the Geotextile Division’s ongoing fight against the EPA’s proposal to include geotextiles as a product that can be manufactured with recovered materials … after five years as editor, Danette Fettig moves into a marketing position at IFAI and Dawn Sawvel is named GFR editor … Austria-based Polyfelt (later acquired by Royal TenCate) […]
Performance, design, and redundancy
June 1st, 2013
Geosynthetic reinforced walls in the public sector By Dov Leshchinsky and Fumio Tatsuoka Introduction Geosynthetic reinforced soil can be viewed as a subset area of slope stability. In slope stability analysis, the factor of safety signifies the margin of safety against failure. It physically means that its reciprocal value signifies the average mobilization or utilization […]
Retrospective of GRI-25’s retrospective conference
June 1st, 2013
Retrospective of GRI-25’s retrospective conference Retrospective of GRI-25’s retrospective conference By Bob Koerner, George Koerner, and Grace Hsuan On April 1–2, 2013, we held our GRI-25 conference in Long Beach, Calif., within the larger Geosynthetics 2013 conference, on the theme: “A 25-year retrospective on the geosynthetics industry and glimpses into the future.” By all accounts […]
Marine works, geotextile characteristics
June 1st, 2013
From the GMA Techline RE: Marine works, geotextile characteristics I want to know your point of view concerning the selection of the correct geotextile as a separation layer below a submerged reef. The submerged reef section … includes a 2–3 ton double layer laid directly on a geotextile, without insertion of sublayer, because they wanted […]
Scratches on HDPE liners
June 1st, 2013
From the GMA Techline RE: Scratches on HDPE liners A question from Australia Do you have any research or, in the absence of research, an opinion on judging the acceptability, or not, of a scratch on a 2.0mm HDPE liner in a dam? Thanks in advance for your response. Reply: Now this is a very […]
Tensile properties of HDPE
June 1st, 2013
From the GMA Techline RE: Tensile properties of HDPE A question from Australia I wonder if the minimum tensile yield strength for the different material thickness published in GRI-GM13 is based on the average thickness of the material or is it based on the minimum thickness of the material since thickness of the material influences […]
Finding GRI-GG2
June 1st, 2013
From the GMA Techline RE: GRI-GG2 A question from Germany We are searching for the actual version of GRI-GG2. My latest version is from 2000. What is the newest version? Where can I get it? With kind regards. Reply: Our latest revision of GRI-GG2 on geogrid junction strength is Revision 3—Aug. 1, 2005. We will […]
ASTM standards for silt barrier fence
June 1st, 2013
From the GMA Techline RE: Silt barrier fence I have a problem that could not be resolved by the only “approved” fabric manufacturer. I am turning to you in desperation. Our specifications calls for a silt fence with “a maximum slurry flow rate of 0.3 GPM/Sq. Ft.” I have seen this requirement being specified by […]