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Narejo D.,GSE Environmental LLC | Li M.,BGE China | Zimmel E.,GSE Environmental LLC | Wu Y.,GSE Environmental LLC
Geotextiles and Geomembranes | Year: 2013

A layered monolithic filter consisting of a nonwoven needlepunched and a woven monofilament geotextile is presented in this paper. The two geotextiles are mechanically bonded in a needlepunching process to produce a hybrid geotextile on a commercial scale. The fuzzy woven side of the geotextile, resulting from the needlepunching process, is ideally suited for lamination to a geonet, although a standalone filter application is also possible. Filter press tests on the geotextile against a fly ash slurry of 500% yielded a retention efficiency of 99.6%. Gradient ratio values of 1.0-1.5 and hydraulic conductivity ratio values of 0.5-1.0 were obtained against fly ash and FGD gypsum from four power plants. Four field basin tests were performed under the CCRs wherein effluent parameters of total suspended solids, total dissolved solids, turbidity, conductivity and pH were monitored with time. The field tests showed that the fly ash and FGD gypsum contained in the test basins were not migrating with time. © 2013 Elsevier Ltd.


Narejo D.,GSE Environmental LLC
Geotextiles and Geomembranes | Year: 2013

Landfill cover systems invariably include a drainage layer which is most often a drainage geocomposite. Finite element analysis of seepage in landfill covers with a drainage geocomposite was performed to determine the effect of rainfall rate, slope length, slope angle, anisotropy, multiple materials and three-dimensional slopes on the pressure head above the liner. Simple methods, based on published equations, were found to provide similar maximum pressure head on the liner as the steady state finite element analysis when only the geocomposite was involved in the drainage. Pressure heads for transient, more-than-one-material, three-dimensional and anisotropic cases were found to be very different from simple solutions. The finite element analysis showed the variation of pressure head along the liner to be highly non-linear with the geocomposite and cover soil saturation occurring simultaneously. The seepage analysis was combined with a limit-equilibrium slope stability analysis to determine factors of safety against slope failure and compare the results with simple methods. © 2013 Elsevier Ltd.


Trademark
GSE Environmental LLC | Date: 2016-08-04

geocomposite material for use as a filter and drainage medium for geotechnical sites.


Trademark
GSE Environmental LLC | Date: 2016-08-04

geotextile filters for geotechnical sites.


A geocomposite with a geonet and a geotextile. The geotextile has a nonwoven fabric layer and a woven fabric layer, with the nonwoven fabric connected by needle-punching to the woven fabric whereby fibers of the nonwoven fabric extend through and beyond the woven fabric, and the woven fabric and fibers of the nonwoven fabric extending through the woven fabric are bonded to one side of the geonet.


Patent
Gse Environmental Llc | Date: 2013-02-11

A geomembrane liner for a containment system including liner panels and connected by a seam at overlapped edges, with the top panel having a conductive lower surface which is non-conductive across the seam. Heat welding of the seams is accomplished by a welder having a heating unit with a projection which interrupts the conductive lower surface of the top panel before forming the seam. Such seams may be used separately or selectively with a lined containment system having a plurality of liner panels covering at least a portion of the containment system bottom. The liner panels have a conductive lower surface and overlap with adjacent panels, and conductive members underlie adjacent panels and contact the conductive lower surface of both adjacent panels to provide an electrical connection between the conductive lower surfaces of the adjacent panels.


Patent
GSE Environmental LLC | Date: 2014-09-09

A method for forming a geomembrane liner testable for leaks by securing adjacent panels together with the conductivity of the lower surface of an overlying panel broken along a line adjacent the panel overlapping edge, and the overlapping edges sealed along the line. A heat welder has slots for the overlapping panel edges, with a heated wedge between the slots and having a projection to break the conductivity of the overlying panel bottom surface as it passes the wedge. The slots merge to press the liner edges together to heat weld them along the line of broken conductivity as the welder is moved along the panel edges.


A geotechnical application including a geotechnical site having a process area sensitive to temperature. A geosynthetic sheet covers the site process area, wherein the geosynthetic sheet includes an ultraviolet (UV) light stabilizer, is substantially impervious to water, and is at least translucent to light. The geosynthetic sheet prevents heat loss to the air which helps to elevate and/or maintain the temperature of the process area.


Patent
GSE Environmental LLC | Date: 2014-05-06

Geomembrane liners suitable for use at elevated temperatures up to 100 C., as well as master batch compositions suitable for preparing such geomembrane liners.


Patent
GSE Environmental LLC | Date: 2014-11-17

A geonet having a length substantially greater than its width and including no more than first and second layers of strands. A first plurality of substantially parallel strands extends in the lengthwise direction and defines the first layer of strands, and a second plurality of substantially parallel strands is disposed on top of, and at an angle relative to, the first plurality of strands and defines the second layer of strands. The first and second plurality of strands are substantially incompressible and secured to one another at crossover locations. Geocomposites include geotextile bonded to at least one side of the geonet. The geonets/geocomposites are laid in geotechnical construction sites in the direction of expected drainage flow.

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