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2014WinShotcreteEMag

2013 Outstanding Architecture Project Comprehensive Geotechnical Solutions Transform Old to New An abandoned rock quarry is transformed into a decorative landscape, opening up usable land for high-end condominium construction By Russ Ringler, Solomon Reyes, and Lisa Wagman Glezer T ASA teamwork to complete a cost-effective MD, for the construction of many prominentDC, Beltway. In use since the mid-1800s, rockwas quarried from 8101 River Road in Bethesda,-he Stoneyhurst Quarry project is an outstanding example of using collaborative and sustainable project producing maximum use buildings in and around Washington, DC. of functional space. As part of the Maryland Environmental and The retired Stoneyhurst Quarry is located at Mine Reclamation program, the retired quarry the intersection of River Road and the Washington, has undergone a transformation to allow for the development of a new high-end mid-rise condo- minium project. Because the quarry was cut into the side of the hill, rather than a deep excavation in the ground, a unique system of retaining walls was used to stabilize and support the quarry walls. Consideration was given to many types of retaining walls for this project, but top-down construction of soil nail walls was selected, as they offered the maximum design flexibility and lowest cost. Furthermore, the soil nail wall system provided the safest solution for this challenging project by providing the slope stabilization and the permanent retaining wall in one combined system. In 2009, the design-build contractor for the soil nail walls contracted with Top Gun Com- Fig. 1: Stoneyhurst Quarry in final stage of production mercial Gunite of VA, Inc., led by Owner Russ Ringler* and Superintendent Solomon Reyes, the primary ACI Certified Nozzleman on the project, to do the top wall in the highest section to prove the design and construction concept. The original plan was to then cover the wall with rock. How- ever, when the top wall was completed with a very attractive high-quality faux-rock finish, the owner was so pleased with the finished product they decided to use that method on all 11 retaining walls for the project. Soil Nails Walls: Perfect Solution Soil nail walls consist of soil nails (or anchors) combined with shotcrete structure and facing. They can be used in temporary or permanent Fig. 2: Top wall being transformed with faux-rock finish *Member of ASA. 44 Shotcrete • Winter 2014


2014WinShotcreteEMag
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