Efficiency of using an increased area grillage as part of a columnar pile foundation

Abstract

Listen

Translate article

In this paper, we propose to apply the idea of an integrated foundation used for slab grillage to a columnar pile foundation. In mass design, having determined the required number of piles based only on their bearing capacity, they try to place them in a pile as compactly as possible to reduce the cost of the grillage, whose work is not taken into account. If the piles are placed at a considerable distance from each other or compactly placed under the column, but the grillage size is sufficiently large, this can compensate for the small number of piles by including the grillage in the work The mathematical modelling of the pile foundation operation was performed using the SOFiSTiK software package. A study of the implementation of the pile foundation with a soil foundation was carried out, depending on the grillage size, length, number, placement of piles in the grillage and soil conditions. Homogeneous sandy and clayey foundation soil is considered. It is shown that in the case of using complex pile foundations with sparse pile placement and increased grillage area, the efficiency of the foundation as a whole and its individual elements increases. In order to save materials, it is possible to reduce the number of piles in a group while increasing the grillage size without losing the bearing capacity of the foundation. It is known that a pile is a much more expensive structure than a grillage, so reducing the number of piles while increasing the overall size of the grillage can lead to a more economical solution. The mathematical modelling of the pile foundation operation using the SOFiSTiK software package confirmed the main conclusions on the distribution of forces between the elements of the pile foundation, obtained earlier by physical modelling on small-scale models and using the Plaxis 3D Foundation software package.