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Overlap seam specifications for geotextile separators
February 1, 2023 | Q&A: GMA Techline
Q:What is the typical overlap for a geotextile used as a separator in a highway project?
Transitioning from 30 MIL PVC geomembrane to 60 MIL HDPE
February 1, 2023 | Q&A: GMA Techline
Q:I have a client that operates a Subtitle C landfill that utilizes a double-liner system of 30 mil (0.76mm) PVC geomembrane for the base liner. They are wanting to evaluate the possibility to transition from 30 mil (0.76 mm) PVC to 60 mil (1.52 mm) high-density polyethylene (HDPE) geomembrane for t…
Strength Reduction Of Geogrids Used In Reinforced Walls
February 1, 2023 | Q&A: GMA Techline
Q:At the moment there are two issues that create uncertainty with the use of PET fabrics and geogrids in the Netherlands. First, for many years we built pile-supported geosynthetic reinforced embankments (so-called piled mattresses to reduce settlements under embankments on soft soils). The fill is …
Geomembranes with better performance
February 1, 2023 | Q&A: GMA Techline
Q:We are researching liner alternatives for an industrial client that will have lined impoundments subject to high temperature influent (>140 degrees F), low pH (1 SU+/-), and may have organic contaminants. Are there any polyethylene geomembranes that meet these requirements?
Geogrid durability and cement
October 1, 2022 | Q&A: GMA Techline
Q: I am searching for data or specifications pertaining to long-term degradation resistance of geogrid exposures to cement—more specifically, cement-treated soils. Your assistance would be greatly appreciated.
Underwater wick drain installation
October 1, 2022 | Q&A: GMA Techline
Q:We have an underwater wick drain application in the Delaware River adjacent to the Delaware Memorial Bridge. S. T. Hudson Engineers Inc. is working with the Delaware River & Bay Authority (DRBA) on a ship collision protection system (SCPS) at the piers in the river. There is up to 50 feet (15 …
Designing Reinforced Soil Structures
October 1, 2022 | Q&A: GMA Techline
Q: Why is strain compatibility important in designing reinforced soil walls?
Liner system leakage estimations
October 1, 2022 | Q&A: GMA Techline
Q: What is the anticipated leakage rate through a composite liner (i.e., geomembrane on low-permeability soil) system?
Geosynthetic clay liner with aquiclude
August 1, 2022 | Q&A: GMA Techline
Q: We are trying to design and construct an aquiclude with a geosynthetic clay liner (GCL). Do you have any experience with this application where a GCL has been used as the impervious barrier between a flowing stream and the underlain geologic formation?
Working on an ethylene interpolymer alloy (EIA) specification
August 1, 2022 | Q&A: GMA Techline
Q: I have an upcoming project that will use ethylene interpolymer alloy (EIA). Is the Geosynthetic Research Institute (GRI) working on a specification for this material?