Geogrid reinforcing behind rigid concrete retaining walls

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I participated in the Bologna Symposium and I [was] very happy and honored to see you live. I read a [GMA Techline] answer published in Geosynthetics magazine (Oct./Nov. 2009, p. 58), “Geogrid use behind rigid concrete retaining walls.” You refer to the Japanese rai…
HDPE liner panel orientation?

June 1, 2014  |  Q&A: GMA Techline

From the GMA Techline I am reviewing a construction report where a landfill cell has HDPE one-sided texture laid about 45 degrees from the direction of steepest slope across approximately one-third of the sideslopes. I am looking for quantitative data on any testing done with this type of orientatio…
Steep geosynthetic-reinforced slopes stabilize access routes for construction of 27-km tunnel

June 1, 2014  |  Case Studies

Semmering Base Tunnel project in Austria By Sören Schmidt Introduction Following two years of preparatory work, main construction began on Austria’s 27-km Semmering Base Tunnel in January 2014. The tunnel between Mürzzuschlag and Gloggnitz on the Vienna–Villach/Graz main line i…
Geotextile tube coffer dam provides solution to hydroelectric project construction challenge

June 1, 2014  |  Products

By Gerardo Marti Introduction South-central Chile is blessed with mountains, rivers, an abundance of rain, and usually a predictable annual snowmelt runoff. All of these natural environment and climate conditions allow for the inexpensive sustainable hydroelectric generation of electricity. With Chi…
Geosynthetics: The science that makes green roofs work

June 1, 2014  |  Products

Green roofs 101: From bottom to top By Allan Wingfield Introduction Most green roofs use a variety of geosynthetic materials to support healthy and sustainable installations. Geosynthetics contribute in many ways to the operational success and long-term sustainability of green roof systems. Because …
The importance of geosynthetic performance testing

June 1, 2014  |  News

Bob Koerner Most people would agree that the analysis of failures is important. The basic reasoning is that each such case history represents a situation where the designed factor-of-safety value has fallen below unity. Conversely, each case of nonfailure represents a factor-of-safety value of one o…
An association for the geosynthetics industry

June 1, 2014  |  News

By Lucie Passus According to Merriam-Webster, an association is an organized group of people (or companies) that share a common interest. As GMA’s former managing director, Andrew Aho, wrote in his April 2013 GMA column in Geosynthetics on the history of GMA, this association was born out of a…
Geonet structure, short-term stress/strain behavior, and creep test methods

June 1, 2014  |  Feature

Part 1: Allowable stress on geonets By Dhani Narejo and Sam Allen Introduction Several types of geonets are used in numerous applications worldwide. Examples of the types of geonets include biplanar, triplanar, spiked or profiled, cuspated, tubular, and three-dimensional (3-D) filament meshes (see F…
The influence of soil type on interface behavior under pullout conditions

June 1, 2014  |  Feature

Part 3: European experience in pullout tests By Nicola Moraci, Daniele Cazzuffi, Lidia Sarah Calvarano, Giuseppe Cardile, Domenico Gioffrè, and Piergiorgio Recalcati 1. Introduction The rapid increasing application of geosynthetics as reinforcement elements for earth structures requires a car…
Enter your award-winning geosynthetics projects now

June 1, 2014  |  News

Deadline for 2014 International Achievement Awards (IAAs) is June 30 The deadline for entries in the 2014 International Achievement Awards, sponsored by the Industrial Fabrics Association International (IFAI), is fast approaching—June 30, 2014. For the 2014 IAAs, there are 31 categories, inclu…