摘要
为研究CRTSⅢ型无砟轨道板在太阳辐射、环境温度及其他自然因素影响下的温度场分布及演化特征,基于昌吉赣高速铁路丰城段CRTSⅢ型无砟轨道板现场实验开展研究,通过传热学的基本原理构建轨道板温度场解析解模型,研究轨道板内温度场的变化。研究结果表明:CRTSⅢ型轨道板上表面与环境温度变化基本同步,下表面与环境温度变化之间存在约2 h滞后;轨道板距上表面约0.12 m的区域内温度波动大,其温度梯度曲线变化最为明显,轨道板下方区域越靠近板底面的温度变化越小,相应的温度梯度曲线也较为平缓;由现场实测数据显示昌吉赣高速铁路丰城段CRTSⅢ无砟轨道板的最大正负温度梯度均出现在夏季,分别为93.3℃/m、-44.1℃/m,对比实测数据,本文所建的温度场解析解模型计算的最大正负温度梯度分别为93.8℃/m、-43.9℃/m,二者计算结果较为接近;基于本文模型,综合考虑不同地区所在省份的差异性,提出了不同地区轨道板正负温度梯度建议值。
To study the temperature field distribution and evolution characteristics of CRTSⅢballastless track plate under the influence of solar radiation,environmental temperature and other natural factors,the analytical model of the temperature field of the track plate is constructed based on the basic principle of heat transfer.The change of temperature field in the track plate is studied according to on the field measured data of CRTSⅢballastless track plate in the Fengcheng Section of Nanchang-Ganzhou High-speed Railway.The results show that the change of the upper surface of the CRTSⅢtrack plate is almost synchronous with the ambient temperature,there is a lag of about 2 hours between the lower surface and the ambient temperature,the temperature fluctuation is large in the area where the track plate is about 0.12 m from the upper surface,and the change of the temperature gradient curve is the most obvious.The temperature change of the lower area of the track plate closer to the bottom of the plate is smaller,and the corresponding temperature gradient curve is gentle.The field measured data show that the maximum positive and negative temperature gradients of CRTSⅢballastless track slabs in the Fengcheng Section of Nanchang-Ganzhou High-speed Railway appear in summer,being 93.3℃/m and-44.1℃/m respectively.Compared with the measured data,the maximum positive and negative temperature gradients calculated by the analytical model of temperature field established in this paper are 93.8℃/m and-43.9℃/m respectively.Based on this model and considering the differences of different regions in different provinces,the suggested values of positive and negative temperature gradients of track plates in different regions are proposed.
作者
曾润忠
张佳
胡文韬
金晨
ZENG Runzhong;ZHANG Jia;HU Wentao;JIN Chen(Jiangxi Key Laboratory of Intrastructure Satety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;The 902 Brigade,Bureau of Geology of Jiangxi Province,Nanchang 338000,China)
出处
《铁道标准设计》
北大核心
2022年第3期35-41,共7页
Railway Standard Design
基金
国家自然科学基金项目(51968023)
国家杰出青年科学基金项目(51725802)
国家自然科学基金高速铁路基础研究联合基金(U1934208)
江西省交通运输厅科技项目(2016C0004,2020Z0001)
江西省自然科学基金项目(20202BABL204067)
江西省研究生创新资金项目(YC2020-S361)。
