Abstract
The damage to the track structure and the influence to the line deformation have greatly deteriorated with the increase of the axle load compared with that of the ordinary trains. However, there is a paucity of experimental research on the dynamic influence of the heavier haul freight trains on the railway tracks. The objective of this study is to investigate the dynamic behaviour of heavy-haul railway track induced by heavy axle load by field experimental tests. The wheel–rail dynamic force, the track structure dynamic deformation and the track vibration behaviour are measured and analysed when the train operates in the speed range from 10 to 75 km/h and the axle load of vehicles varies from 21 to 30 t. Comparisons between the results for the axle conditions of 25 and 30 t are made in this paper to reveal the axle load effects. It is demonstrated that part of the indicators reflecting the dynamic behaviour of the railway track increases approximately linearly with the train running speed and axle load, while others are influenced negligibly
Highlights
Heavy-haul transport has been widely concerned worldwide due to its advantages such as large transport capacity, high efficiency, and low transportation costs
With the increase of the axle load, the dynamic interactions between the rails and the wheels become more serious, for this reason it is highly necessary to ensure the safety of the railway track structure systems
Some conclusions can be drawn from this study as follows: 1. conventional testing methods can effectively measure the dynamic behaviour of railway track structure, and the corresponding time history results are presented
Summary
Heavy-haul transport has been widely concerned worldwide due to its advantages such as large transport capacity, high efficiency, and low transportation costs. This transportation mode is one of the major trends for freight transportation development, where expanding train formation and increasing axle load are two basic methods. As one of the basic methods, increasing the axle load has exhibited an important role in the development of heavyhaul transport. This method has been broadly adopted by all the major countries. A deep understanding of the dynamic performance of the railway tracks under heavy axle-load is required
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