| Ice-coating acting on the road is a complex process with water, heat and power influencing each other. The change of water and heat of roadbed and resulting temperate field, stress field and water field redistributing are the main reasons for road damage. To understand the influence of ice-coating on temperate field, stress field and water field correctly is one of the most effective means to explore frozen mechanism of frozen road.With the finite element software MSC.MARC, numerical simulations on multi-field coupling for iced road surface have been performed. The main contents are as follows:1. Thermo-mechanically couple FEM analysis of iced road. The influence of environmental temperature, cooling rate, thickness of ice-coating and basic level materials of pavement on the temperature field and stress field were studied respectively.2. Water-thermo-mechanically couple FEM analysis of iced road. Based on the thermo-mechanically couple FEM analysis, the influence of water is considered. The obtained results were compared with those of thermo-mechanically coupled analysis.3. Thermo-mechanically couple FEM analysis under car load. Subroutine of moving load was programmed to simulate moving cars at an even speed. Based on the second development of the software MSC.MARC, thermo-mechanically couple analysis under such different situations as with (without) ice-coating and vehicle load and other different loads have been researched. Different analysis results were compared.The results show that ice-coating mainly influences surface course and base course. The lower the environment temperature and the higher the cooling speed, the steeper the relationship curve between stress and time is. The temperature stress value of bituminous base material is much higher than that of cement stabilized crushed stone and graded broken stone. When the vehicle load affects the ice-coating road, ice-coating influences pavement stress greatly and vehicle load affects pavement displacement obviously. |
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