Methodology for measuring dynamic response of railway track components at rail joints
Аннотация
The reasons of failures, dynamic loads, vibrations and residual deformations occurring at the zone of rail joints of the railway track operating in the conditions of Uzbekistan and possibilities of their mitigation are scientifically and practically studied in the given article. It has already been proved that when the speed of the train is great and the loading high, the dependability of the components of the track superstructure of the railway track is decreased, particularly, in the area of railway joints, the geometry violations, transverse displacements and longitudinal ones, and the destruction of crushed stone of the prism of ballast are increased exponentially. Being the object of the research, were laid on an experimental station chosen on a segment of JSC “Uzbekistan Railways” on the basis of a regular train service. The potential of decreasing the vertical stiffness and enhancing the dispersion of the downward force by adding the use of elastic substrates beneath the sleepers in the area of rail joints has been examined. Experimental measurements were conducted at 2 measurement points in order to determine dynamic effects using a mobile engineering seismometric station and SM-3 sensors. The findings indicated that with the presence of elastic substrates beneath the sleepers on the zone of rail joints, the angle of load distribution within the layer of the ballast becomes larger, the stresses in the foundation, and the magnitude of vibrations become lower. This is used to increase the lifespan of the structural components of the upper structure of the railway track, decrease the repair expenses at present, prolong the inter-repair service, and enhance the safety of the train traffic.