CONTENTS FEATURES I DFI Executive Editor Helen Robinson, P.E. [email protected] Managing Editor Emeritus Manuel A. Fine, P.E., [email protected] Advertising Manager Karol Paltsios, [email protected] Graphic Design Faye Klein DFI Executive Committee President John R. Wolosick, P.E., D.GE Vice President Dan Brown, Ph.D., P.E., D.GE Secretary Matthew Janes, P.Eng. Past President Robert B. Bittner, P.E. Other Trustees David Borger, P.E. Gianfranco Di Cicco Conrad Felice, Ph.D., P.E. Frank Haehnig Bernard H. Hertlein, FACI Gerry Houlahan, P.E. James O. Johnson K.S. Rama Krishna, Ph.D. Marine Lasne Anne Lemnitzer, Ph.D. J. Erik Loehr, Ph.D., P.E. Matthew E. Meyer, P.E. Thomas D. Richards, P.E., D.GE Alan Roach Martin G. Taube , P.E., P.G. Stefano Valagussa Michael H. Wysockey, Ph.D., P.E. Treasurer COVER STORY 12 Cut-and-Cover Excavation Challenges Sitotaw Y. Fantaye, P.E. ® DEEP FOUNDATIONS The Magazine of the Deep Foundations Institute (DFI) is published bimonthly by DFI. 326 Lafayette Avenue Hawthorne, NJ 07506 USA T: (973) 423-4030 | F: (973) 423-4031 Email: [email protected] Executive Director Theresa Engler, [email protected] The first segment of the Second Avenue Subway extension is approaching construction completion. While most of the two-track, twin-tunnel subway was constructed using bored tunnel methods with a tunnel boring machine, other key sections were constructed by the cut-and-cover method. This required the contractor to design and implement a stiff, tightly-braced retaining wall to tie the existing tunnel constructed in the 1970s to the new station, temporary street decking over the entire excavation, and a wide range of excavation support systems at various locations. 65 Member Profile: Adda Athanasopoulos-Zekkos: Civil Engineering “Touches our Lives” 71 High-Capacity Micropiles for Crane Foundation Support Terence P. Holman, Ph.D., P.E., and Brian D. Barkauskas, P.E. Crane foundation support represents one of the riskier problem areas in geostructural and construction engineering. This case history involved the use of an 1,800 tonne (1,984 ton) capacity Mammoet PTC ring crane for a series of long-radius, high-altitude lifts. High-capacity micropiles, installed in a surgical manner among utility lines and in regular radial patterns in unimpacted areas, were used to value engineer the foundation and substitute for drilled shafts. DEEP FOUNDATIONS • MAR/APR 2016 • 3 O T N A S D I N N S U T O I T F U E P T E E D
