Axial Capacities Of Drilled Displacement Piles Predicted By Spt And Cpt Based Methods

Deep Foundations Institute
Genesis Z. Figueroa Anne Lemnitzer Sam Warren Antonio Marinucci
Organization:
Deep Foundations Institute
Pages:
11
File Size:
1093 KB
Publication Date:
May 1, 2022

Abstract

Drilled Displacement Piles (DDP) provide an ideal deep foundation solution that combines the benefits of ground improvement with traditional advantages of piling systems. This paper consolidates data from 20 construction projects in which more than 30 DDPs were installed and tested axially. High quality site exploration data (e.g., Cone Penetration Test and Standard Penetration Test) were evaluated to derive geotechnical analysis parameters. The test sites consisted of mostly mixed soil types with strongly stratified layers of sand, silt, and clay. Pile diameters ranged between 40 cm and 61 cm. Test results were compared with predictive methods developed specifically for DDPs as well as methods used in general geotechnical practice. The accuracy of the empirical methods is presented in terms of total pile capacity, pile length/diameter, and soil type. The large majority of all examined methods underpredict the in-situ pile capacities. It was also found that the difference between the tested and predicted capacity is strongly related to the level of improvement in the surrounding soil due to the piles’ installation. A general comparison between predictive axial accuracy and the observed level of ground improvement upon installation is also discussed.
Citation

APA: Genesis Z. Figueroa Anne Lemnitzer Sam Warren Antonio Marinucci  (2022)  Axial Capacities Of Drilled Displacement Piles Predicted By Spt And Cpt Based Methods

MLA: Genesis Z. Figueroa Anne Lemnitzer Sam Warren Antonio Marinucci Axial Capacities Of Drilled Displacement Piles Predicted By Spt And Cpt Based Methods. Deep Foundations Institute, 2022.

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