Malishevska A. INFLUENCE OF THE LEVEL OF HORIZONTAL TRANSVERSE FORCES ON THE RESOURCES OF RAILS IN THE CONDITIONS OF THE KHARKOV UNDERGROUND

In the work on the basis of theoretical analysis and experimental studies, the spatial stiffness of the rail supports, which are used in the conditions of the Kharkov metro track, are determined. The dependencies of the changes, these parameters, during the operation of the track have been established. The theoretical substantiation was carried 20 out, experimental researches were carried out, and the equivalent coefficients of the dissipation of the rail bearings of the metro trains were determined at vertical and horizontal transverse loads, and the level of vertical and horizontal strut forces on the tracks of the rolling stock of the underground was determined. An analysis of the operational stability of rails in the conditions of the Kharkov metro is carried out. The basic types of defects are established. Using the methods of mathematical statistics, the main reasons for the appearance of these defects are established. Using the methods of reliability theory, a mathematical model for determining the resources of the rails has been developed, taking into account the effect of horizontal transverse forces. An analysis of the operational stability of rails in the conditions of the Kharkov subway is carried out. It is established that the main defects are defects of contact-fatigue origin in the form of metal excruciation on the side of the work part of the rails. Using methods of mathematical statistics it was established that the main reason for the appearance of such defects is the horizontal transverse forces. Using the methods of reliability theory, a mathematical model for determining the resources of the rails has been developed, taking into account the effect of horizontal transverse forces. The model of the model is based on the criterion of the general work of external forces, which is necessary for the formation of the maximum permissible number of defects. It is established that there is a technical possibility to increase the normative resource of work of rails by 5.5-11%. The recommended values of standard service life of rails in the conditions of the Kharkiv metro were included in the "Technical instructions for the use of old rails of length. 12,5 and 25 meters in the tracks of the Communal Enterprise "Kharkiv Metropoliten" (approved by Order No. 73 of 11.02.15).