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Results of the “DPDT-Auger” research project on screw displacement piles

Krasiński Adam, Słabek Andrzej, Więcławski Paweł, Wiszniewski Mateusz, Kusio Tomasz, Tisler Witold

Architecture Civil Engineering Environment

2023

Vol. 16, no. 3

89--99

The main objective of the “DPDT-Auger” research project was to test the prototype DPDT auger for forming screw displacement piles in the ground (patented in Poland in 2020). An additional aim was to develop design methods and rules for the making of such piles. The augers and piles were first tested on a model scale, and then more extensively in the real scale on experimental field plots. The results found the overall functionality of the DPDT auger to be good, and in several aspects better than that of the SDP auger. The load-bearing capacities and Q-s characteristics of piles made with both augers were considered comparable. All the conducted tests and their derived dependencies together with the results of in situ subsoil tests allowed for the development of empirical calculation methods and prognostic procedures, useful for designing and producing piles with DPDT and SDP augers. FEM numerical simulation rules for the considered piles were also developed, verified and calibrated by the results of real pile tests. This article describes only the most important final results of the research project but not the detailed results of the numerous tests and analyses that were carried out. Also omitted are the results of model tests and numerical simulations, as well as the implementation and acceptance recommendations, as they have already been or will be the subject of separate publications.

Praktyczne aspekty wymiarowania pali na podstawie wyników sondowań statycznych CPTU

Zieliński P., Wojtasik A. T.

Mosty

2017

nr 5

36--40

W obowiązującej w Polsce normie dotyczącej projektowania geotechnicznego posadowień na palach – Eurokod 7 (PN-EN 1997-1, 2008) – podano 4 metody obliczania fundamentów palowych (pkt 7.4.1 normy). Jedną z nich jest projektowanie na podstawie obliczeń z wykorzystaniem metod empirycznych lub analitycznych, do takich zalicza się projektowanie na podstawie wyników badań sondą statyczną CPTU.

The article presents the information on the authors experience related to the design and completion of pilling works designed based on the results of the CPTU soundings, gained during many years of completing large-scale motorway projects. The first parts gives the examples of pile bearing capacity calculations based on methods that apply the results of the CPTU testing. The second part of the article presents a critical analysis of the CPTU results presentation and interpretation, which is crucial for further design analysis.