Abstract:
The paper presents the results of the study of the
proposed type of variable profile piles. The proposed
type of piles is reinforced concrete driven piles segmented in length. Each subsequent section has a radial displacement along the axis of symmetry relative
to the previous section. The positive effect of the performance of the proposed pile is to change the nature
of the lateral contact of the pile with the soil, and to
increase the drag of the soil. The conducted research
is aimed at solving the problem related to the relatively low bearing capacity of traditional square section piles. The research was carried out by the method
of model tests of piles on a test bench (tray) at a scale
of 1:10. The tests were performed for variant pile
types in comparison with a standard square section
prismatic pile. The adopted dimensions of the pile
model allow the use of this tray without the influence
of its boundary conditions on the stress-strain state of
the soil. A total of 42 tests were performed, 3 tests for
each type of piles compared. Evaluation of pile bearing capacity was performed by static loading of pile
models with vertical indentation load until failure.
According to the results of the investigations, the
resistance values of the compared pile types in the soil
were obtained, as well as the dependence of bearing
capacity changes on the section dimensions and on
the rotation angle. According to the results, the optimal pile solution was selected. The bearing capacity of the proposed optimal pile solution exceeds the
bearing capacity of the standard driven pile by 22 %.
The results obtained allow us to conclude about the
influence of the technological solution of the proposed
pile type on its serviceability in soil conditions.
