Junction-strength requirements for roadway design, construction

February 1st, 2007

By Barry R. Christopher Introduction Currently many engineers are confused about junction-strength requirements for geogrids used in roadway base reinforcement and subgrade stabilization applications, primarily because of commercialism of junction strength requirements. Some promotional efforts recommend relatively high junction strength, while others dismiss junction strength altogether. Confusing? At least one local public agency specifies a […]

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Liner integrity/leak-location survey: The significance of boundary conditions

February 1st, 2007

By Ian D. Peggs Introduction A geoelectric integrity survey was requested on a new landfill cell with the following lining system from the top down: 18 in. sand Geotextile/geonet/geotextile composite (geocomposite) Primary geomembrane Geosynthetic clay liner (GCL) Geomembrane (rub sheet) Geocomposite Secondary geomembrane Prepared subgrade There was no sand above the primary geomembrane in half […]

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Massive mining evaporation ponds constructed in Chilean desert

February 1st, 2007

The Salar de Atacama in Chile is the site of the largest PVC geomembrane installation in the world—more than 16 million m2 utilized in mining operations since 1996. By Dominic Berube,1 Patrick Diebel,2 Andre Rollin,3 and Timothy D. Stark4 The largest PVC geomembrane installation in the world is so immense that it can be seen […]

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Five-year CalTrans freeway project is nearing completion in San Diego

February 1st, 2007

From the 2006 International Achievement Awards for Geosynthetic Projects Introduction In an effort to reduce traffic congestion and improve safety conditions in northern San Diego, the California Department of Transportation (CalTrans) is adding lanes and creating a truck bypass at the Interstate 5/805 junction. A unique portion of this project is the construction of a […]

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Using structured geomembranes in final solid-waste landfill closure designs

February 1st, 2007

By Ronald K. Frobel, MSCE, P.E. Introduction Slope failures on final cover systems for solid-waste landfills have been well-documented during the past 20 years with many failures of note within the past three years. Sliding failures have occurred despite known geotechnical reasons for failures and known design methods to avoid slope failures. Many of these […]

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Horses and the land: Geosynthetics help to improve riding trails

February 1st, 2007

Professor worries animal that helped tame America labelled as enviro outcast. By Tom Lollis Clemson University professor Gene Wood has two great passions—horses and the land. He hopes the two are never separated because of a dispute over natural resources. “The horse is burned into the American psyche,” said Wood, a forest wildlife ecologist. The […]

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Thanks and thanks again!

February 1st, 2007

To the editor: I just read the October/November 2006 edition of Geosynthetics. Thanks for your coverage of the recent U.S. Army Corps of Engineers/Steve Stockton presentation to your Geosynthetic Materials Association Executive Council. Also, thanks for GMA’s support of the Water Resources Development Act of 2006. It is good to know that organizations like yours […]

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