This article is an example of the calculation of a foundation monolithic slab using void formers during the construction of an apartment complex consisting of three buildings located on one stylobation. The issue of economy in the construction of a hollow core base slab compared to a solid one, by reducing the volume of concrete and reinforcement due to the location of liners in the neutral zone of concrete, is considered. At the same time, the bearing capacity and rigidity of the structure should remain at the same level.

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Currently, a number of difficulties arise in the construction of dense urban areas, as well as in the reconstruction and superstructure of existing buildings and structures. Often when carrying out geological scene investigation, it is not possible to determine the strength parameters of the soil directly under the foundation. In most cases, this leads to understating of its characteristics, which is reflecting in the excessive economic costs resulting from the need to strengthen the existing building structure. However, in many situations, this can be discarded, justifying it by calculations. In this paper is shows the performed series of numerical experiments and were analyzed the changes of existing building foundation settlements, taking into account its long-term exploitation in assessing the impact of new construction. The base had defined by a single-layer half-space with a limited depth of deformation zone and composed of medium-sized sand. PLAXIS 2D software was chosen to create the calculation model. When processing the results, it was possible to identify a certain dependence that allows estimating the maximum settlement of existing building in the impact assessing from new construction taking into account the duration of building operation. The obtained data prove the necessity to take into account the change in strength properties of soils caused by long-term loads action of structures.

The article is devoted to one of the most effective and promising methods for improving the structural properties of soils - the method of “Geocomposite”. The method is based on the compaction and reinforcement of the soil through the injection of mortar under high pressure, as a result of which there is a fundamental change in the soil body and the formation of a rigid structure naturally inscribed in the soil layer. The method is widely used both to improve the mechanical properties of soils for new construction, and for raising and eliminating the tilt of the operated buildings (compensation injection). The article presents brief information about the technology of shoring soil using the “Geocomposite” method and the main differences in the formation of fixed volumes in cohesiveless and cohesive soils.