ENR Reports that Pennsylvania Route 22/322 now has the longest MSE Wall in the U.S. and Canada, and the 2nd longest in the world. The project is located in Mifflin County, Pa. and involves adding an additional 2 lanes in a bifurcated alignment to supplement the existing 2 lanes in a dangerous stretch of roadway known as â€œLewiston Narrows,â€ between the Juniata River and Shade Mountain. The project also involves approximately 9,000 micropiles, 8,280 linear ft of shoreline retaining walls (nine), and approximately 40,000 ft of H-piles were driven for the retaining wall and for two bridges. (Photo by the Reinforced Earth Company)
Side-hill retaining walls refer primarily to fill-walls built partway down the sides of an existing slope or embankment. They are encountered in roadway and rail widening projects as well as site development but usually in steep terrain. This article provides an overview of the problems, failure mechanisms, investigation approaches, analysis tools and wall type alternatives for these structures. Click through to read the article!
This summer, the National Concrete Masonry Association (NCMA) will release the third edition of its Design Manual for Segmental Retaining Walls (DMSRW) along with SRWall 4.0 software for the design of segmental retaining walls. SRW walls with higher wall heights often make use of geotextile or geogrid reinforcement putting them in the category of mechanically stabilized earth retaining walls or MSE Walls. The first edition of the manual was published in 1993 and is routinely used for everything from landscaping walls to multi-tiered commercial and residential retaining walls. This summer is shaping up to be a busy one for those in the retaining wall business as the FHWA NHI 2009 MSE Wall Manual is set to be released around the same time frame as well. Read on for more info on the DMSRW. (Screen shot by Gabriela Mariscal from NCMA via CE News)