Study of the stress–strain state of the «Soil – Foundation -Structure» system with consideration of genetic nonlinearity

Abstract

The study examines the features of modeling the stress–strain state of the “soil–foundation–structure” system with consideration of genetic nonlinearity, which reflects the sequential changes of the calculation scheme during the construction of a building. It is shown that traditional linear calculations do not fully represent the actual processes of interaction between structures and the soil foundation. Three calculation models were considered for the analysis: a traditional scheme with “instantaneous” load application; a scheme with genetic nonlinearity but fixed vertical dimensions of the foundation model; and a scheme with genetic nonlinearity combined with refinement of the deformation properties of the foundation by adjusting the compressible layer thickness at each stage of construction.

The results demonstrated that Model 2 leads to overestimated settlement values at the initial stages, resulting in a conservative outcome. The most realistic results were obtained with Model 3, which accounts for changes in the compressible layer thickness at each construction stage. This approach makes it possible to reduce not only the absolute settlement values but also the relative deformations of the foundation slab, thereby decreasing stress levels in the underground structural elements of the building and revealing certain reserves in their performance.