Geosynthetics and erosion control

February 1, 2018

Terra firma often does not morph in ways that modern society appreciates. Erosion from stormwater, snowmelt, long-term water flow and unrelenting waves sweep away soil and rock from steep slopes, riverbanks, ditches, channels, shorelines, building foundations and much more. To understand the power of erosion, simply think about the Grand Canyon, which was formed by …

U.S. representatives pen letter encouraging use of geosynthetics

On Nov. 17, 2017, 10 members of the U.S. House of Representatives sent a letter to Secretary of Transportation Elaine Chao encouraging the U.S. Department of Transportation (USDOT) to consider including the benefits of geosynthetic materials in future infrastructure legislation. “Geosynthetic materials are a critical, innovative element of the transportation construction industry,” the representatives wrote, …

IGS-NA webinars

IGS-NA established a webinar program in November 2017. This program is designed to address a wide range of technical topics and audiences. Some of the webinars will be instructional and aimed at advancing the use of geosynthetics by the engineering community at large. Other webinars will be aimed at member audiences addressing topics interesting to …

A risk assessment for MSE wall projects

During the past 40 years, mechanically stabilized earth (MSE) walls have gained wide acceptance within the public and private sectors, becoming the standard of practice for filled walls. The evolution away from the concrete cantilever wall has occurred primarily because MSE walls are less expensive to construct and easier to design and build. The Federal …

GMA Techline

Determining quantity of recycled HDPE in a geonet Q: I have a question about high-density polyethylene (HDPE) geonets. Is it possible, by thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) analysis, to determine the quantity of recycled HDPE present in a geonet? I have a geonet that, I think, is made with virgin and recycled …

Part 2: Controlling uplifting gas bubbles in exposed geomembrane-lined ponds

Part 1 of this series in the October/November 2017 issue of Geosynthetics demonstrated how the size, shape, pressure, and stresses and strains experienced by geomembrane bubbles surrounded by a confining fluid could be analytically estimated. Two different field case histories exhibiting the extremes of bubble sizes in ponds lined with 60-mil (1.5-mm) high-density polyethylene (HDPE) …

Erosion control at a former nuclear testing site

A reclaimed 175-acre section within the larger Rocky Flats National Wildlife Refuge in Jefferson County, Colorado, west of Denver, was home to a nuclear testing facility for 40 years. The area’s combination of rolling topography, high winds and incidents of heavy rain and snow increase the likelihood of soil erosion. Given the site’s past use, …