Application of circular foundations for television towers and smoke pipes

Abstract

The results of observations of the deposits of TV tower and chimney foundations are presented. The effective use of annular foundations in the erection of tower-type structures in complex engineering-geological conditions indicated the problem of studying the joint work of these structures with soil soils. An attempt to solve this problem was made by the authors of this article, using the results of full-scale, design, calculated practical studies. Purpose: to study the peculiarities of development of soil deformations of the foundations of annular and annular pile foundations during the construction and operation of tower type structures.

Objectives: 1. Determination of the size and shape of annular foundations on the character of the development of deformations of the soil of the bases by means of an experiment.

1. To experimentally detect the development of sediments and the depth of the deformation zone in the bases of annular foundations during the construction and operation of tower-type structures.
2. To confirm the possibility of construction and operation of structures on annular foundations on multilayered ground foundations in the presence of layers of weak water-saturated soils.

The effect of pressure from the external load on the sole of the foundations and their area is determined by the depth of the compressed soil thickness. It has been experimentally proved that with increasing of the area of the foundations the depth of the deformation zone increases in the bases composed of multilayered soils, which are underlain by water-saturated peat or high-porous silt loam.The influence of the settling value of the following parameters, which can be expressed by dependence, is established:

S = f (Pcp, Ha, Ea, ν)

The value of the cross-ratio is influenced by the area of the foundation. Its maximum value is observed in foundations with small width. As the area of the foundation increases, the value of ν decreases, and for the base plates of the large area approaches zero. When comparing the joint work with the base of the circular foundations with circular equal area, it is experimentally determined that the coefficient of lateral expansion, which depends on the depth of the compressed deformation zone, at the same pressure in the circular foundations is greater than in the annular ones.