Project overview

The construction of large building structures and the increasing utilisation of soft soil results in rising interest in the use of pile foundations. Striving to minimize the costs of construction and the rationalization of expenditures requires optimization of projects, and hence detailed knowledge of the behaviour of piles under load.

To date, there is considerable controversy among specialists in the field of foundations regarding the mechanisms of transferring loads from piles to subsoil, and in particular the distribution of load on individual adjacent piles and the amount of initial stresses generated at the stage of pile installation.

The degree of complexity of the problem is influenced by particulate nature of soil, its spatial variability, mutual interaction of adjacent piles, mechanical, material and geometrical features of the system, the order and the technology of piles installation and many other factors. The problem complexity results in a wide variety of design methods. Unfortunately, these methods do not give consistent results, and what is more, it is difficult to assess which design method is more reliable and describes the physical reality better.

The Institute of Civil Engineering at the University of Zielona Gora (UZ) together with the Geotechnical Department of the Kyiv National University of Construction and Architecture (KNUCA) and the Department of Geotechnics of the West Pomeranian University of Technology (WPUT) implement an international research project "Pile tests - 2019".

The project includes the study of a single pile (natural scale) in field conditions, the study of a single pile model in the laboratory scale and the study of a group of five piles (natural scale) in field conditions.

The natural scale pile experiments (the single pile and the pile group) are carried out in Kyiv (Ukraine) on embankments of alluvial sands formed in a process of hydraulic fill while regulating Dnieper riverbed, where soil conditions are relatively homogeneous.

The laboratory pile tests are performed in a specially prepared test chamber in Szczecin (Poland).

The in-situ soil tests (CPTu, DMT) and laboratory tests of the soil were already performed by researchers from Zielona Gora (Poland) in 2018.

The objectives of the project are to check the adequacy of the results of model studies of a single pile in relation to its behaviour in a natural scale and to find out to what extent the test loading of a single pile reflects the reactions of a group of piles to the load.

Participants interested in predicting the behaviour of the piles are invited to a competition which will be resolved on a special session.

The details on the in-situ pile tests are presented in In-situ tests tab. The laboratory pile tests are described in Laboratory tests tab. The conditions of the competition are presented in Competition tab. The soil conditions are available after registration for the Conference.