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 SPECIAL ISSUE : GROUNDWATER CONTROL DEWATERING AND 91 Construction Dewatering Challenges in Urban Environments Rafael A. Rivera As compared to rural projects, excava- tions in urban areas face numerous challenges, including accessibility, proximity to adjacent properties or structures, and construction induced deformations to these existing structures. When performing excavations below the existing water table in urban areas, contractors face additional concerns, including those associated with ground- water drawdown, discharge, subsidence and contamination. This article discusses different methodologies used to facilitate construction below the groundwater table. DEEP FOUNDATIONS • MAY/JUNE 2017 • 3 83 The Secret to Dewatering Gregory M. Landry, P.E. In many projects, dewatering is often misunderstood or neglected until the last possible moment. This article describes commonly used dewatering methods and addresses a fundamental misunderstan- ding about how to determine the amount of dewatering effort required for a project. SPECIAL ISSUE : GROUNDWATER CONTROL DEWATERING AND COVER STORY 14 Anchored Diaphragm Wall and Dewatering System for Libya Hotel Claudio Asioli ® 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] Trevi S.p.A. designed and constructed anchored diaphragm walls and dewatering systems for the excavation of a two-level basement car park for the Al Ghazala Intercontinental Hotel in Tripoli, Libya. The raft foundation for the hotel required dewatering the area to allow excavating in the dry down to a maximum depth of about 40 ft (12.2 m) below the existing ground surface. Cover Photo Credit: Trevi S.p.A. SPECIAL ISSUE : 77 Dale Biggers – Epitome of a Gentleman, a Passion for the Pile Driving Industry GROUNDWATER CONTROL DEWATERING AND O T N A S D I N N S U T O I T F U E P T E E D
