THE DIFFERENCE IN THE OPERATION OF SHORT AND LONG PILES IN THE COMPOSITION OF A COLUMNAR PILE FOUNDATION ACCORDING TO THE RESULTS OF PHYSICAL MODELING

Abstract

In the work, on the basis of physical modeling on small-scale models, the joint operation of piles and a low grid as part of a pile foundation was investigated and analyzed. The operation of a grid without piles and a grid with different numbers of piles of two standard sizes was considered separately. The force in the piles of the bush was monitored using tensometric equipment. The nature of changes in the share of the grid and realization of the load-bearing capacity of piles in the foundation with changes in their number and length in the group with constant dimensions of the grid were considered. The possible load-bearing capacity of the bush was analyzed according to two theoretical hypotheses: as the sum of the load-bearing capacities of single piles without taking into account the grid plate and as the sum of the load-bearing capacities of single piles and the load-bearing capacity of the grid plate as a foundation for shallow laying without piles. Failure to take into account the work of the grid as part of the foundation gives underestimated values of the loads on the bush, and taking into account the work of the grid without adjusting for the redistribution of forces between the elements of the bush during pile placement leads to an overestimation of the load-bearing capacity of the bush. When evaluating the bearing capacity of a bush through the bearing capacity of its individual elements, it is necessary to proceed from the degree of realization of these bearing capacities in the composition of the bush. The efficiency of using short piles compared to long piles was evaluated.