solution for the derivation of interaction factors between piles in a group configur- ation embedded in inhomogeneous soil. The method is suitable for implementation in a design oriented software package and design charts have been provided by the authors for use in hand calculations. “A Sensitivity Analysis on the Para- DFI Journal: Volume 12, Issue 3 Available “Measured End Resistance of CFA The most recent edition of the DFI Journal, Volume 12, Issue 3, is now available. This truly international issue, with a practical focus on foundation design and a collection of great case studies, includes the following papers: “Statistical Evaluation of Design Methods for Micropiles in Ontario Soils” by Alexandre P. R. P. Almeida and Jinyuan Liu. Almeida was the 2018 DFI Student Paper Competition winner. In this research paper, Almeida, a graduate student at Ryerson University in Toronto, Canada, and his advisor, Professor Jinyuan Liu, studied a total of 47 full-scale micropile load tests to determine the most suitable design method to predict the geotechnical capacity of micropiles in Ontario soils. “The Deep Soil Mixing for the Gal- ataport Project in Istanbul, Turkey,” by Marco Chiarabelli, Salvatore Miranda and Federico Pagliacci. This case study describes the technologies and performance controls utilized to provide a special geotechnical engineering solution for this comprehensive project that includes the construction of diaphragm walls, deep foundation systems, liquefaction mitigation, and implementa- tion of dewatering systems. “Settlement of Axially Loaded Pile Groups in Inhomogeneous Soil,” by Jamie J. Crispin and Colm P. Leahy. In this research paper, Crispin, the runner-up award winner of the 2018 DFI Student Paper Competition, and his Ph.D. advisor Professor Leahy, both at the University of Bristol, provide a closed-form analytical DEEP FOUNDATIONS • MAY/JUNE 2019 • 51 meters Affecting Large Diameter Helical Pile Installation Torque, Depth and Installation Power for Offshore Applica- tions,” by Giovanni Spagnoli, Cristina de Hollanda Cavalcanti Tsuha, Pierpaolo Oreste and Carlos Mauricio Mendez Solarte. The case study presents a sensitivity study on the uplift capacity of helical piles with different helix to shaft ratios. Two uplift capacity equations and two torque models were considered by the authors. The soil properties have been selected to simulate typical values offshore North Sea clays. The analyses were performed in terms of undrained conditions to simulate the torsional resistance during installation and the short-term pile capacity. and Drilled Displacement Piles in San Francisco Area Alluvial Clay,” by T. C. Siegel, T. J. Day, B. Turner and P. Faust. This technical note presents a local relationship for the end resistance of continuous flight auger piles and drilled displacement piles for San Francisco Bay area clays. Fully mobilized end resistance from 15 high- quality axial compression loading tests performed on cast-in-place piles are compared to the average net cone resistance for one diameter below the pile tip. An online subscription to the DFI Journal is included with DFI membership, and issues can be accessed by signing in to the member portal — MyDFI. Members and nonmembers can order printed copies of the 2007-2013 volumes of the Journal from the publications page of www.dfi.org; members at preferential rates. Contact [email protected] for information about DFI Journal subscriptions.
