GSI offers geosynthetics short courses online

August 19th, 2021

MSE wall in Franklin, Tenn. Photograph courtesy of Pinnacle Design/Build Group Inc. The Geosynthetic Institute (GSI) is hosting three short courses on-demand online. GSI and Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI short course registrations. Course 1: Quality Assurance/Quality Control of Geosynthetics in Waste Containment Facilities Recording […]

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Industry standard for wall drainage systems?

June 1st, 2021

Q: I just watched your recorded video of mechanically stabilized earth (MSE) wall inspection. Thank you for the presentation; it was very informative. I do have a follow-up question for you. I was recently the site engineer for a precast panel MSE wall and now have the opportunity to inspect construction of the wall that […]

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Anchors, tie-rods and whalers

April 1st, 2021

Q: We are having issues related to obstructions in the reinforced zone of our mechanically stabilized earth (MSE) retaining walls. In the first case, there is a rock outcrop that is limiting the length of the geogrid reinforcement. In the second case, we have a drop-down inlet structure to divert stormwater, which is in the […]

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GSI to host webinar on MSE inspection

January 18th, 2021

The Geosynthetic Institute (GSI) will sponsor a webinar, “Mechanically Stabilized Earth (MSE) Wall, Berm and Slope Construction Inspection,” on February 10, from 11:30 a.m. to 1 p.m. EST. Geosynthetic Materials Association (GMA) member companies and their employees receive discounted rates on all GSI webinar and short course registrations. The inspection (aka, monitoring) of MSE wall, […]

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Ground improvements using geofoam: A case history

October 14th, 2020

By Javaid M. Alvi, Ph.D., and Jahangir J. Kabir, Ph.D., P.E The project site is a triangular-shaped property located at the intersection of Raleigh Avenue and West Liberty Avenue in the Borough of Dormont, Allegheny County, Pa. (Figure 1). The site housed two Nissan buildings, one with a showroom at the top floor and the […]

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TRB to host webinar on updating designs for MSE walls in AASHTO

September 1st, 2020

The TRB Standing Committees on Transportation Earthworks and Geosynthetics will jointly organize a TRB webinar on "Updating Designs for Mechanically-Stabilized Earth Walls in AASHTO."  Bridge-design specifications were updated this year, with the largest change to designs for MSE walls in more than 20 years. TRB will host a webinar on Oct. 8, 2020, from 2:00–3:30 […]

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PVC sheet piling for cutoff and containment barriers

August 1st, 2020

By Brendan Sheppard and Steve Hargrave FIGURE 1 30-foot (9.1-m) long PVC sheet pile installed with a fixed mast pile driver in August 2015 Polyvinyl chloride (PVC) sheet piling (Figure 1) has been used for more than 25 years in bulkheads throughout the United States and beyond as a replacement for steel, concrete and timber […]

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Geogrid reinforced soil structures reach new heights

June 1st, 2019

By Sachin Mandavkar and Mehari Weldu FIGURE 1 U.S. Route 460 RSS during construction Reinforced soil structures are geotechnical systems consisting of reinforcing elements and primarily include mechanically stabilized earth (MSE) walls and reinforced soil slopes (RSS) (Figure 1). MSE walls and RSS are constructed by placing alternating layers of reinforcement and compacted soil behind […]

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Geosynthetics for reinforcement and stabilization

June 1st, 2019

Geosynthetics are widely used for reinforcement and stabilization, particularly in transportation-related applications, including base stabilization, reinforced soil slopes (RSS) and mechanically stabilized earth (MSE) walls. This issue of Geosynthetics considers many such applications from multiple viewpoints. Sachin Mandavkar and Mehari Weldu look at very tall MSE walls and RSS through several case studies in “Geogrid […]

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MSE wall failures can be mitigated through the use of geotextile filters

April 1st, 2019

For the past 17 years, the Geosynthetic Institute (GSI) has been accumulating data on failures of geosynthetic reinforced mechanically stabilized earth (MSE) retaining walls. We presently have 320 cases, of which 201 (63%) have been caused in whole or part by water within, or adjacent to, the reinforced soil zone. We sincerely hope that our […]

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