CONTENTS FEATURES COVER STORY I DFI Executive Director Theresa Engler [email protected] Executive Editor Helen Robinson [email protected] Managing Editor Emeritus Manuel A. Fine, [email protected] Advertising Manager Karol Paltsios, [email protected] DFI Executive Committee President, John R. Wolosick Vice President, Dan Brown Secretary, Michael H. Wysockey Treasurer, Matthew Janes Past President: Robert B. Bittner Other Trustees Patrick Bermingham David Borger Gianfranco Di Cicco Rudolph P. Frizzi Frank Haehnig Bernard H. Hertlein Gerry Houlahan James O. Johnson K.S. Rama Krishna Marine Lasne J. Erik Loehr Matthew E. Meyer James A. Morrison Thomas D. Richards Alan Roach Stefano Valagussa 55 Member Profile — Lori Simpson, P.E., G.E., Principal, Langan Treadwell Rollo: Technical Excellence and a Passion for Code Reform 61 SRT System Stabilizes Levee at Power Plant Miriam Smith, Ph.D., P.E. A coal-fired power plant in New Madrid, Mo., required repair of shallow slope failures along its levee. The power plant had a 23 acre (93,000 sq m) raw water pond to store water for use in plant operations. Slope failures occurred over several years along a 1,000 ft (305 m) stretch of the levee as a result of rapid draw-down of the pond. Plate piles were installed in marginally stable slopes to increase the factor of safety against a shallow slope failure. DEEP FOUNDATIONS • MAR/APR 2015 • 3 12 Bertha Rescue Shaft – SR99 Tunnel Richard Hanke, P.Eng. and Lance Rasband ® 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] On December 6, 2013, Bertha—the world’s largest tunnel boring machine—came to a halt while mining on Seattle’s SR99 tunnel. Initial reports stated that an obstruction had stopped the machine in its tracks. After removing the obstructions and clearing a path forward, it was discovered that the machine’s internal main bearing had been damaged during the initial drive. Removal and repair of the main bearing and seals required a significant effort to create an access shaft large enough to take apart the entire cutter head assembly and gain access to Bertha’s inner workings. O T N A S D I N N S U T O I T F U E P T E E D