CONTENTS FEATURES I DFI Executive Director Theresa Engler [email protected] Executive Editor Helen Robinson, P.E. [email protected] Managing Editor Emeritus Manuel A. Fine, P.E. [email protected] Advertising Manager Karol Paltsios, [email protected] DFI Executive Committee President John R. Wolosick, P.E., D.GE Vice President Dan Brown, Ph.D., P.E., D.GE Secretary Michael H. Wysockey, Ph.D., P.E. Treasurer Matthew Janes, P.Eng. Past President: Robert B. Bittner, P.E. Other Trustees Patrick Bermingham David Borger, P.E. Gianfranco Di Cicco Rudolph P. Frizzi, P.E., G.E., D.GE Frank Haehnig Bernard H. Hertlein, FACI, M.ASCE Gerry Houlahan, P.E. James O. Johnson K.S. Rama Krishna, Ph.D. Marine Lasne J. Erik Loehr, Ph.D., P.E. Matthew E. Meyer, P.E. James A. Morrison, P.E. Thomas D. Richards, P.E., D.GE Alan Roach Stefano Valagussa 69 Member Profile — William Walton, P.E., S.E., Senior Vice President, GEI Consultants: Ingenuitive Engineer and Energetic Leader 75 The Challenges of Deep Excavation in Manhattan Bedrock Laurence E. Ford, P.E., Scott M. Garfield, P.E., Arthur J. Alzamora, Jr., P.E., and Andrew J. Ciancia, P.E. Manhattan, known for its skyline of tall buildings, is considered the most densely built and populated city in the U.S. and one of the most populated in the world. Constructing many hundreds of tall buildings in such a dense area is possible because of the rela- tively shallow depth and capacity of Manhattan’s metamorphic bedrock. While the strength of the bedrock is advantageous, it creates many challenges for construction. DEEP FOUNDATIONS • JULY/AUG 2015 • 3 COVER STORY ® 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] 12 Excavation Construction for the Transbay Transit Center Professor Youssef M. A. Hashash, P.E., Kaitlyn L. Fleming, Mohamad Jammoul, Stephen McLandrich, G.E., Andrew Yeskoo, Nick O’Riordan, P.E., Pierre Gouvin and Professor Michael Riemer In downtown San Francisco, a unique large-scale excavation in saturated soft soils was constructed for the Transbay Transit Center (TTC). Construction of the excavation began in April 2012 and was completed almost two years later in February 2014. To monitor ground and structure response to construction, the project team used an extensive instrumentation network that included automatic inclinometers, piezometers, strain gages and total stations paired with survey markers. Innovative imaging techniques developed a record of construction in order to relate measured deformations to construction activity. Front and back cover photos courtesy Stephen McLandrich O T N A S D I N N S U T O I T F U E P T E E D
