Ramsey B.J.,GSE Environmental LLC
10th International Conference on Geosynthetics, ICG 2014 | Year: 2014
It has been established that the vast majority of damage and subsequent less than perfect performance of geosynthetics in barrier applications is a consequence of the installation process. Soil placement, traffic on the lining system and general construction activity have been demonstrated to be sources of damage to geosynthetic materials. The industry has addressed this in many ways; the most direct being liner integrity surveys, but other significant contributions include Construction Quality Assurance (CQA), special design approaches, independent third-party materials validation and requirements for geosynthetic installation capability. Multiple techniques and methodologies exist for liner integrity surveys, each having its strength and weaknesses. Key issues include testing after cover soils have been placed, testing of side slopes, testing over welded areas, folds and/or other discontinuities within the geomembrane system, testing at penetrations and the degree of accuracy required in damage location identification. Each currently used system offers a set of advantages and disadvantages. Many industry participants have developed new materials and techniques that expand the application of all methods of liner integrity surveys. This paper discusses the advantages of these new developments, incorporates the newly developed materials and apparatus and proposes a new best-practice standard for geomembrane barrier installations and offers some concrete estimates of the effectiveness of these systems and technology. Source
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.
GSE Environmental LLC | Date: 2013-03-07
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.
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.
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.