| Scott M. Mackiewicz, Ph.D., P.E., to Present at Deep Foundations Conference and International Conference on Piling and Deep Foundations |
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| Monday, 08 December 2008 12:55 |
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Scott M. Mackiewicz, Ph.D., P.E., from Kleinfelder’s Lenexa, Kansas presented at the 33rd Annual Conference on Deep Foundations and 11th International Conference on Piling and Deep Foundations in New York October 15th-17th. Industry leaders from around the globe will provide a broad perspective on deep foundation practice in the urban environment and the challenges associated with it at the conference. Dr. Mackiewicz’s presentation titled, “Skin Friction in Shale: Results of the Hwy. 81 Bridge, Yankton, South Dakota Drilled Shaft Load Test,” describes the design and installation of the load test drilled shaft as well as presents the load test results as compared with predicted design values determined using FHWA methods for the replacement of the historic vertical-lift span Meridian Bridge that connects Yankton, South Dakota with rural Cedar County, Nebraska. The new 76-foot wide, 1,590-foot long steel plate girder structure required the use of drilled shaft foundations extending into the underlying Carlile Shale formation. Designers indicated an individual drilled shaft capacity of about 2,200 kips will be needed at each of the river piers, and based on the subsurface information, eight to ten-foot diameter drilled shafts extending to about 115-foot would be required for support of the bridge structure. An Osterberg Load Test was performed on one test shaft to determine the ultimate skin friction and end bearing of the Carlile Shale. |
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