Field investigations of combined raft-pile foundation with adjustable interaction between the raft and the piles

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Publication Title
Field investigations of combined raft-pile foundation with adjustable interaction between the raft and the piles

Abstract
A new design of a combined raft pile foundation, which is devoid of the shortcomings of similar existing design solutions and installation methods, and an engineering method for determining its main parameters, are proposed. This technical solution has been implemented at one of the construction sites in Kharkiv (Ukraine). The proposed design makes it possible to efficiently use the load-bearing capacity of the soil base by involving the raft part in response to the loading in a controlled manner with the transfer of up to 50% of the total load to this without going beyond the allowable strains of the soil base. The remaining 50% of the load is taken up by piles. After determining the multiplicity of the pile spacing and their parameters costs can be reduced by up to 35% in comparison with other design solutions for combined raft pile foundations. The results of field surveys of the initial settlements of the piles as part of a combined raft pile foundation (CRPF) are presented, which is not in contact with the raft that settles during the construction of a multi-story building. Based on the field investigations, a qualitatively new dependency of the pile deformation on the effect of additional loading forces of soil friction was found, which shows the upward sliding effect of the pile because forces of friction are higher than the resistance forces on the lateral surface of the pile with the manifestation of reverse (elastic) deformations of the soil base of the pile, which indicates the need to consider this phenomenon when setting the size of the gap between the raft and the piles in the designs of similar CRPF.
Authors
Oleksandr Samorodov; Sergii Tabachnikov; Oleksii Dytiuk; Oleg Krotov; Yuriy L. Vynnykov; Yuriy Kirichek; Volodymyr Shapoval

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

A - New developments on structural design

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