CONTENTS FEATURES I DFI Graphic Design Faye Klein DFI Executive Committee President Dan Brown, Ph.D., P.E., D.GE Vice President Matthew Janes, P.Eng. Secretary Gianfranco Di Cicco Treasurer Michael H. Wysockey, Ph.D., P.E. Past President John R. Wolosick, P.E., D.GE Other Trustees David Borger, P.E. Conrad Felice, Ph.D., P.E. Frank Haehnig Gerry Houlahan, P.E. James O. Johnson K.S. Rama Krishna, Ph.D. Anne Lemnitzer, Ph.D., P.E. J. Erik Loehr, Ph.D., P.E. Matthew E. Meyer, P.E. David Paul, P.E. Howard Perko, Ph.D., P.E. Thomas D. Richards, P.E., D.GE Alan Roach Lori Simpson, P.E., G.E. Martin G. Taube , P.E., P.G. Stefano Valagussa 65 New Double-Walled Pile Technology for Noise Attenuation Per Reinhall, Ph.D., Julie Hampden, and Tim Dardis In this article, a double-walled pile with an air gap between the two piles is presented. This design minimizes noise generated during pile driving, which can harm sensitive aquatic wildlife. With this design, only a minimal amount of noise escapes at the pile toe. Full-scale field testing has shown increased noise attenuation and good pile drivability. DEEP FOUNDATIONS • MAR/APR 2017 • 3 COVER STORY 14 Cockatoo Island Seawall Seepage Barrier Russell J. Denny and Chris L. Powell (Cover Photo Credit: Wagstaff Piling ) ® Executive Director Theresa Engler, [email protected] Executive Editor Dr. Antonio Marinucci, M.B.A., P.E. [email protected] Managing Editor Emeritus Manuel A. Fine, P.E., [email protected] Managing Editor and Advertising Manager Karol Paltsios, [email protected] 61 Herb Engler: Outspoken, Sincere and Well-Meaning Wagstaff Piling installed a seepage barrier through a rockfill seawall to allow the continued expansion of the Cockatoo Island subsea iron ore mining operations in the northwest of Western Australia. The grout curtain, comprising both jet grouting and permeation grouting techniques, provided a cutoff from inundation by the sea, which facilitated access to and mining of the high- grade ore. 73 Complex Deep Foundation System for Tall Tower in NYC Sitotaw Y. Fantaye, P.E., T.C. Michael Law, Ph.D., P.E., G.E., Renzo D. Verastegui, P.E., and Alfredas Daugiala A complex foundation system incorpor- ating permanent secant pile walls and drilled shafts was used to overcome num- erous challenges to create an 80 ft (24.4 m) deep excavation for a slender structure rising to more than 750 ft (229 m) on a site about 60 ft by 100 ft (18.3 m by 30.5 m). Challenges included soft and highly- permeable rock, nearby NYC transit tunnel, high groundwater table, and settlement concerns of sensitive neighboring buildings. O T N A S D I N N S U T O I T F U E P T E E D
