JUSTIFICATION OF THE IMPROVED SOIL BASE MODEL FOR THE CALCULATION OF DIFFERENTLY-STOREYED BUILDINGS

Formulation of the problem. In the field of construction of multi-story and high-rise buildings, with significant loads on the foundation, especially in the presence of weak water-saturated soils on top, pile-slab foundations are usually used to meet the requirements of the normative document [4] for maximum permissible deformations. The possibility of using slab foundations in this case must be confirmed by calculations with a scientific and technical justification of the accepted model of the soil foundation and its parameters. The purpose of the is to substantiate the application of the model of the soil base in the form of an elastic layer of finite width and its parameters based on observations of the subsidence of adjacent multi-story buildings on slab foundations during the construction process and to compare the actual values of foundation deformations with calculated. Conclusions. Modeling and calculation have been performed for adjacent slab foundations of a two-section multi-story building, taking into account the different floor counts of the sections during construction in the “base − foundations – structures” system. This system interacts with an improved soil base model, represented as a continuous “stepped” layer of finite distributive capacity with different soil deformation laws. The research results confirmed the possibility of using the improved soil base model for predicting the deformations of differently-storeyed sectional buildings on large slab foundations, where weak water-saturated sandy soils lie close to the surface. Numerical studies indicate that considering different compressible layer thicknesses under variably loaded foundations in the base model, combined with the “Hardening Soil” deformation law, allows for the most accurate modeling of the horizontal displacements (tilts) of each section of the two-section building.