<p><p><h2>Project Summary/Scope:</h2>Redevelopment of a sloping site adjacent to Interstate 395 in Alexandria, VA required construction of retaining walls. Rammed aggregate piers were used to support the wall, rather than large diameter drilled shafts due to economic considerations.</p><p>Subsurface conditions: Deep uncontrolled fills and large areas of marine clay.</p><p>Four rows of 750-mm diameter rammed aggregate piers were installed in a 1.5- meter triangular grid pattern. Shaft lengths extended to depths of up to 6 meters. Tight access and large concrete debris interfered with drilling operations, but did not delay construction.</p><p>The MSE wall supported by the rammed aggregate piers is 20 feet tall and 450 feet long. An access road was to be constructed atop the wall, so a 10 kPa surcharge<br>was used in the analysis.<br><h2>Complementary Technologies Used:</h2>MSE Wall<br><h2>Alternative Technologies:</h2>Drilled shafts were an alternative, but aggregate piers were used due to economic considerations.<br><h2>Project Technical Paper:</h2>Lien, B. H. and Fox, N. S. (2001). “Case Histories of Geopier® Soil Reinforcement for Transportation Applications.” Proceedings, Asian Institute of Technology Conference. Bangkok, Thailand. November.<br><h2>Data Case History Prepared:</h2>November, 2012</p></p>