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 “Lewiston Narrows,†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)
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New NCMA Segmental Retaining Wall Design Manual and Software
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)
MSEW and FoSSA Updates from ADAMA Engineering
Side Hill Retaining Walls – Part 2
In this part 2 of 2, various types of retaining walls are examined as possible alternatives in a side-hill retaining wall situation. These include conventional wall types such as CIP walls, MSE walls, gravity walls and soldier pile walls and some less conventional approaches such as lighweight concrete fill, hybrid soil-nail and geofoam wall systems, ground improvement and micropile walls.
Part 1 of this Side Hill Retaining Wall article covered the definition, significance, problems and failure modes, investigation techniques, analysis, and construction considerations of side hill walls. A PDF version is now available for download as well. Click through for the article and the download link!