ABSTRACT
The article is devoted to the method of increasing the bearing capacity of pile foundations. In this paper, the problems of quantitative assessment of the residual deformations and stresses in the transformed soil layer as a result of the application of additional vertical pressure to the base prior to loading of the pile foundation are considered. According to numerical calculations in spatial formulation, it was found out that the use of compaction in soils with a deformation modulus of E = 6 MPa allows increasing the load bearing capacity of pile foundations at pressure Pcom from 50 to 150 kPa by creating additional horizontal stresses along the lateral surface of the piles. An assessment was made of the nature of horizontal displacements of soil during compaction and changes in the stress state of the base along the pile shaft, affecting their interaction. To study the effect of compaction on the pile operation in the laboratory, a series of experiments were conducted, which examined the impact of compaction at pressure Pcom = 100 kPa on the change in the bearing capacity of piles in a sandy foundation with a given compaction coefficient. The results of the change in the bearing capacity of piles without compaction and using the soil compaction technology are presented.
