Abstract：Research purposes: In recent years，because of its good economic heavy haul railway has an extensive constructions. Subgrade of heavy haul railway bears larger dynamic load of heavy haul train. In order to analyze the heavy haul railway dynamic load’s influence to roadbed diseases better, and further optimize the thickness of subgrade bed of heavy haul railway，this article uses the three-dimensional finite element software analyzing the dynamic stress changes of heavy rail subgrade bed from the following factors: ballast thickness，surface of subgrade bed’s thickness and modulus，axle load，etc.
Research conclusions; through numerical analysis and comparison with the existing heavy haul railway embankment measured dynamic stress，the follow conclusions are obtained:(1)The dynamic stress in the vertical variation as the axle load，ballast bed thickness，surface layer of subgrade bed’s thickness and modulus’s changes is obtained. The vertical dynamic stress in the subgrade bed increases with the axle load increasing, and decreases with the thickness of ballast bed increasing, and the surface layer of subgrade bed’s modulus and thickness have little effect on the vertical dynamic stress. ( 2 ) 30 t axle load of heavy haul railway compared with 23 t axle load of ordinary railway increases by about 30%，while increasing the thickness of ballast bed can significantly reduce the dynamic stress .Compared with 35 cm thickness of ballast bed，the dynamic stress by using 50 cm thickness of ballast bed can decrease about 20%.(3)The reasonable numerical model and parameter for calculating dynamic stress of heavy railway subgrade obtained. Meanwhile，these provide a reasonable calculation for structure design of heavy rail subgrade bed thickness.
Tong Liyuan , Liu Songyu , Qiu Yu , etc. Current Research State of Problems Assorig}d with Mined - out Re梦ons under Expressway and Future Development [J].Chinese dourna! of Rock Mechanics and Engineering , 2004 ( 4 ) ;1198-1202.
Liu Xi, Zhang Kun, Li Xiaofan. Research on the Assessment Method for Stability of Railway Crossing Small-sized Mined-out Region [J].Journal of Railway Engineering Society , 2012 (12 ) ; 32-35.
[3]潘瑞林.采空区物探方法新探[J].铁道勘察，2010(6):23-25.
Pan Ruilin. New Approaches of Geophysical Exploration for Mining Zone [ J ].Railway Investigation and Surveying, 2010(6);23-25.
[4]铁道第一勘察设计院铁路工程地质手册[M].北京:中国铁道出版社，1999.
The 15rst Railway Survey and Design Institute. Railway Engineering Geological Manual [ M].Beijing; China Railway Publishing House ,1999.
State Bureau of Coal Industry. Rules for Coal Pillars Reserving and Mining Coal under Buildings, Water, Railroad, Main Roadway and Shaft[M] .Beijing: China Coal Industry Publishing House ,2000.
[6]赵建峰.采空(人为坑洞)研究[J].铁道工程学报，2005 (增刊);364-368.
Zhao Jianfeng. Research on the Gob(Man-made Cavity )[J].Journal of Railway Engineering Society , 2005(S):364-368.
Wei Yaohu. Research on R}}nforcement of Foundation in Coal Mine Goat for Guangd Coastal Railway[J]. Journal of Railway Engineering Society , 2013 (7) , 6-10.
2014, Vol. 31 
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