In order to find out the decreasing effect of the temperature and thermal stress of the ballastless track when the solar heat reflective and insulation coating was used, a calculation model considering the air temperature, solar radiation and wind speed for the temperature field of the ballastless track was established, and a field test was conducted to verify the calculation model. Then the influence of solar heat-reflective and insulation coating on the temperature of the bi-block ballastless track in Chengdu was analyzed, the thermal stress of the unitary and longitudinal ballastless track before and after using the solar heat-reflective and insulation coating were also calculated, respectively, and the effect of the wind speed on the temperature distribution of the ballastless track with solar heat-reflective and insulation coating was also analyzed. The results show that, the temperature distribution of the ballastless track can be obtained accurately and efficiently by this calculation model. After using this kind of coating, the temperature gradient of the concrete slab drops by 50%, while the whole track temperature remains almost unchanged. The curl stress of the unitary ballastless track decreases significantly when the solar heat-reflective and insulation coating is used. The decreasing effect of this kind of coating on the curl stress is not satisfying when the wind scale is larger than 4.%为研究反射隔热涂料对无砟轨道温度及温度应力的降低效果,建立考虑气温、太阳辐射和风速的无砟轨道温度场计算模型,并开展试验对其进行验证,分析反射隔热型涂料对成都地区双块式轨道温度的影响,分别计算使用该涂料前后单元式和纵连式轨道的温度应力,并探讨不同风速下该涂料的效果.研究结果表明:建立的无砟轨道温度场模型是准确和有效的;成都地区使用该类型涂料道床板温度梯度能够降低约50%,但对轨道整体温度影响不大;使用涂料后单元式无砟轨道翘曲应力降低较为显著;风速超过4级后反射隔热涂料降低轨道翘曲应力的效果一般.
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