CRITICAL ANALYSIS OF METHODS FOR CALCULATING THE STRESS-STRAIN STATE OF THE PYLON-TYPE METRO STATION STRUCTURE

Purpose. Carrying out a critical analysis of the methods for calculating the stress-strain state of the structure of the pylon-type metro station and the justified choice of one of them, which will allow taking into account the complex interrelationship of the elements of this structure and their interaction with the surrounding massif. Methodology. To carry out a critical analysis of methods for calculating the stress-strain state, the structure of the pylon-type metro station was analyzed. Also, the main features of the architectural and constructive solution of the deep laying pylon station are determined. The analysis of the elements and the general structure allowed identifying important parameters, without taking into account of which it is impossible to obtain a close to the real picture of the stress-strain state. Having analyzed the structure of the pylon-type station of deep laying, it was determined that the essential parameter of the formation of its stress-strain state is the spatial factor. Findings. The results of a critical analysis of methods for calculating the stress-strain state of the structure of the pylon-type metro station during its interaction with the surrounding massif represented by solid rocks (the conditions of laying the metro in the city of Dnipro) are presented. It was determined that the use of flat schemes for the calculation of pylon-type stations of deep laying entails a loss of adequacy to the real structure, but some aspects of the flat schemes can be used for the spatial case as well. It has been proven that the approach using numerical methods, for example, the finite element method, as well as the creation of finite-element spatial schemes based on volumetric elements, are the most adequate calculation methods for the calculation situation. Originality. For a pylon-type station of deep laying, the use of finite-element models, which fully reflect the spatial factor that is essential for such a design, has been finally proven. Practical value. The finite-element models of the pylon-type station of deep laying in solid rocks proposed in the scientific work are the most adequate to the real situation of interaction of the structure with the surrounding massif and can be accepted as calculation models for the conditions of the Dnipro metro.