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| Design Research on the Subgrade Structure of Heavy Haul Railway |
| GUO Kang-mei1, WANG Yan1, YE Qing-zhi2, LIU Jing-lei3 |
1. Hebei University of Technology, Tianjin 300401, China;
2. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031,China;
3. The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251,China |
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Abstract Research purposes:Nowadays the design of subgrade thickness of heavy haul railway in China bases on current specification for subgrade design of high speed railway, but work mechanism of the subgrade under the load of heavy haul train and high speed train differs widely from each other. For this purpose, according to elastic theory, track-subgrade three-dimensional finite element model is established in this paper, thus to analyze the dynamic stress distribution and attenuation law of the subgrade at different load levels and in different structural styles. In addition, the design method of dynamic strength control is suggested to confirm the thickness of the subgrade bed of the heavy haul railway under different loads.
Research conclusions:(1) The decay rate of dynamic stress reduces significantly under the load of heavy haul railways on account of the fact that the superimposed effect of shaft should be taken into account. (2) According to the current design method of heavy haul railway, the ratio between dynamic stress and self-weight stress on the design thickness of the subgrade under superimposed load is calculated out to be 0.3~0.5, which does not meet the design requirements. (3) By adopting the dynamic strength design principle, the entire thickness of the subgrade bed should be 2.1~2.3 m under the axle load of 25 tons, 2.8~2.9 m under the axle load of 30 tons, 3.2~3.3 m under the axle load of 35 tons. (4)The conclusions above provide valuable reference for heavy haul railway subgrade bed structure design.
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Received: 23 June 2014
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2014, Vol. 31 
