Dvornyk A. Change in the stress-strain state of the soil base under dynamic influences from the subway

The purpose of this work is to develop an integrated applied methodology for assessing the stress-strain state of a soil base under dynamic influences from the subway in a dense urban development. Experimental research and mathematical modeling of the stress-strain state (SSS) of the soil base of buildings located directly above the metro tunnels were carried out. A comprehensive applied methodology for assessing changes in the stress-strain state under dynamic influences from the subway has been developed, which includes two blocks: an experimental block (1) and a theoretical and computational block (2). The proposed comprehensive approach was implemented in the performance of research work in the SE "State Research Institute of Building Constructions". Mathematical modeling based on the finite element method (FEM) of changes in the stress-strain state of the soil base of buildings and structures, taking into account the results of experimental measurements of dynamic effects on the example of two objects in Kiev, has received further development. The calculation results showed that the parameters of vibration damping with distance from the source strongly depend on the geological conditions of a particular site, the structural scheme of the underground part of the building and the features of the application of dynamic effects. Changes in the SSS of the soil base can lead to additional uneven deformations and deterioration of the technical condition of buildings located in the zone of influence of the metro. The results of modeling according to the above technique can be used to predict additional soil deformations and, accordingly, refine the stress-strain state of building structures under conditions of uneven deformations and dynamic loads. The author took part in development of two state standards of Ukraine.