OasisLMS

Abstract: Drilled displacement (DD) piles have gained widespread implementation as foundation elements, recognized as an efficient alternative for medium driven piles and drilled shafts, owing to their practical and environmental advantages. Load-displacement records substantially reflect bearing capacity, settlement, and the interactions between superstructures and substructures. A database has been compiled comprising 40 full-scale load tests on drilled displacement piles, embracing various types, such as Fundex, DeWaal, Olivier, Omega, and Atlas. The database covers diameters ranging from 356 to 720 mm, with embedment depths varying from 8 to 21 m, installed in cohesive, granular, and mixed deposits. Load-displacement records are presented in the form of projected force, recognized as pressure, versus the ratio of displacement to diameter, namely relative displacement, for unitless results interpretation. Accordingly, a new approach is developed for stress-strain behavior appraisal. Dominant factors were scrutinized, including embedment depth, breadth, and surrounding soil type. Furthermore, the energy conserved through stress and strain integration is realized as capacity. The comparative analysis of the relevant results demonstrates a clear distinction between DD piles and conventional deep foundations. Consequently, the superiority of DD piles has been established. Hence, the proposed approach for stress-strain appraisal advances insights into optimum foundation design.

Dr. ABOLFAZL ESLAMI; Engr. Arshiya Mehrazma

Annual Conference Proceedings