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The field observations and collection of relevant information of curves with different radii are carried out aiming at the rolling contact fatigue (RCF) of U75V heat-treated rail on the curved section of Tangshan-Baotou heavy haul railway. The important characteristics of rolling contact fatigue of rail are obtained through statistics and comparative analysis. Further, the model for initiation of rolling contact fatigue of rail integrating heavy haul train dynamics and damage function model is established to predict the effects of axle load, speed and adhesion coefficient on rolling contact fatigue of rail. It is found that the rolling contact fatigue of rail for up going heavy haul railway is alleviated with the increase of curve radius, there is severe peeling on R600 and R800 curves, the peeling on R1000 curve disappears by and large, while there is just slight cracks on R1600 curve as well as the rail damages of up going heavy haul railway are more serious than those of down going line at no-load. On the section of entering transition curve of up going railway R600, there is obvious peeling when excess of height of inner rail is 55 mm, while there is just sporadic small-size peeling on corresponding outer rail. The numerical simulation results could well explain the phenomena of field observation, which provides the key research tools for further treatment. The curve radius, axle load and profile after wear are determined to be the main influencing factors for rolling contact fatigue of rail in Tangshan-Baotou railway combining with the previous research results.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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