GMA News: GMA had a jam-packed start to the year

June 1, 2018

In January 2018 members of the Geosynthetic Materials Association (GMA) participated in the Transportation Research Board (TRB) Annual Meeting in Washington, D.C. In February our executive council met in Charlotte, North Carolina, to review GMA’s goals and mission. In March a delegation of GMA executives met with representatives from the White House and the U.S. …

Geosynthetic Institute news: On the estimation of live loads in MSE walls and slope design

In formulating a factor-of-safety value for a mechanically stabilized earth (MSE) wall or slope project, a design engineer calculates a ratio of resisting forces to driving forces. This contrast is further recognized when using load and resistance factor design (LRFD), which is in our not-too-distant future. The resisting forces are the soil’s inherent properties (e.g., …

GeoDallas Watch: 2018 GeoDallas schedule announced

June World Environmental & Water Resources Congress June 3–7 | Minneapolis, Minn. Hosted by the Environmental & Water Resources Institute (EWRI) of the American Society of Civil Engineers (ASCE), the World Environmental & Water Resources Congress brings together the top environmental and water resources infrastructure professionals. Topics include erosion and sediment control, numerical modeling, hydraulic …

Presto releases geocell ballast research

Presto Geosystems, manufacturer of the high-density polyurethane (HDPE) GEOWEB® geocell base stabilization system, has released results from railroad-track research performed to quantify the reinforcement benefit of GEOWEB-confined ballast as compared to unconfined ballast. The company said the research was a cooperative effort under the direction of Ben Leshchinsky, Ph.D., P.E., of Oregon State University, and …

Geogrid study initiative wins Center for Transportation Research Award

The University of Minnesota Center for Transportation Studies (CTS) selected Tensar International and its research partners as the winners of the 2018 CTS Research Partnership Award for their work on geogrid usage in paved-road infrastructure. The award recognizes a new pavement design and analysis tool, which enables geogrid benefits to be quantified using an aggregate-geogrid …

Monitoring the performance of Louisiana’s first GRS–IBS bridge

Over the decades, soil mass reinforced by layers of geosynthetics has been used widely and successfully in a variety of earth structures, such as mechanically stabilized earth (MSE) retaining walls, embankments, slopes and shallow foundations. Due to the proven benefits of geosynthetic reinforced soil (GRS), including cost-effectiveness, simple and fast construction, and tolerance of differential …

Springtime failure of a cold-climate geotextile riprap slope

Geotextiles play an essential role in geotechnical projects. A significant use for geotextiles is as a separator and filter in drainage and erosion control applications (Holtz 2002). A temporary erosion control application geotextile, such as silt fencing, is used to prevent soil erosion by containing the soil and turbid water in a onetime operation. For …

Highway deep-patch geogrid applications

Deep patch is a repair technique that has been widely used on low-volume roads in the Pacific Northwest as a cost-effective mitigation technique to address settlement and shallow landsliding of side-cast embankment fill slopes and natural slopes consisting of weak soils overlying stronger soils (Cuelho et al. 2012). A deep patch consists of a subexcavation …

WisDOT publishes study on geotextile puncture test methods

The Wisconsin Department of Transportation (WisDOT) and the Federal Highway Administration (FHWA) funded research into puncture test methods for geotextiles, and the report from this study is now available online. Various tests are conducted to assess and classify a geotextile’s suitability for different applications. One of these tests is the puncture strength test. This test …

Final inspection: GRS–IBS bridge in place in 80 hours

The Rhode Island Department of Transportation (RIDOT) began work on the McCormick Quarry Bridge over Warren Avenue in East Providence on Sept. 23, 2016, using a geosynthetic reinforced soil–integrated bridge system (GRS–IBS). According to the Federal Highway Administration and RIDOT, the technique allowed crews to cut the closure time for the bridge from one year …