Geotube questions

April 1, 2006

From the GMA Techline Subject: GeotubeI refer to the article “Saving Yucatan’s Coast” published in the September 2005 issue of GFR (now Geosynthetics), pages 34-39. Can you please let me know the following: What mathematical calculation was used to derive the appropriate ground level? What was the length of each tube and the filling port …

Construction Quality Assurance and Inspectors Certification Program (CQA-ICP)

By George R. Koerner and Robert M. Koerner GRI White Paper #8January 31, 2006 1.0 Definition of CQA (as opposed to CQC) Construction quality assurance (CQA) and construction quality control (CQC) are widely recognized as critically important factors in overall quality management for waste containment facilities of all types. This includes geosynthetic materials as well …

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A garden grows on a Minneapolis rooftop

Architects, designers, and new geosynthetics build a high-rise green space. By Mason Riddle There is mesh and then there is mesh. For a downtown Minneapolis 10-story penthouse, the proper mesh was critical to the installation and maintenance of a rooftop garden and terrace, which, like the owner’s living quarters, affords impossibly spectacular views of both …

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On the grow: Assessing the U.S. green roof market

Multiple benefits, new technologies are building up green roofs. By Sonja Hegman Green roofs are gaining in popularity as more people acquire knowledge on the subject. Awareness of green roofs as an eco-friendly concept is also being nurtured in the design and architectural communities. And building owners are not as dismissive of green roofs as …

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Eight ways to achieve improved retaining-wall performance

A refresher course for SRW success. By Michael R. Simac Segmental Retaining Wall (SRW) performance can be improved greatly by implementing good construction techniques. Since SRW construction started some 20 years ago, a number of good guidelines have proven to be at the core of a properly executed project. This article highlights those techniques and …

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Berm is working on the railroad

Geosynthetic solution offers both separation and reinforcement for this Canadian rail project. Canadian Pacific Railway (CPR) is renowned for building rail lines through some of North America’s toughest terrain. Just west of Kenora, Ontario, near the Manitoba/Ontario border, the main CPR track crosses the Telford Marsh, an area of weak organic soil. A 250 m …

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Rejuvenated reservoir will irrigate world-famous golf courses

More than 21 acres of geomembrane help revive Pebble Beach’s Forest Lake Reservoir. Originally constructed in the late 19th century, a reservoir near a scenic stretch of California coastline underwent a dramatic transformation last year, and is now poised to serve the irrigation needs of the 21st century Pebble Beach community. Located on California’s beautiful …

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Projects highlight progressive uses of geosynthetics

A problem-solving wall project in Michigan and preserving Stump Pass in Florida highlight two more progressive uses of geosynthetics. First section by Jacob Manthei, second section by Jeff Barbian and Ron Bygness Retaining wall, utilities merged in Michigan Developers and engineers have long tackled the problems with hilly building sites and are ever in search …

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The enhancement of interface shear strength between two nonwoven geotextiles

By Gregory N. Richardson and Pieter K. Scheer Introduction and problem statement Interfaces involving nonwoven to nonwoven geotextile surfaces are sometimes part of the design of landfill liner systems. This is most likely the case in a double-liner system where a geosynthetic clay liner (GCL) is often designed below the upper (primary) geomembrane and is …

Geosynthetics (formerly GFR) receives awards

The magazine formerly known as GFR has received two awards from the Minnesota Magazine Publishers Association. Gold Award for Best Technical Article, Professional, Circulation under 30,000: GFR-Geotechnical Fabrics Report, “On the links with coir, straw and synthetic mats,” April 2005. For this article, the judges said, “ This is a beautiful article! The layout and …