环境因素影响下无砟轨道底座板早期温度场模拟  

Temperature field simulation of early-age ballastless track base plate under influence of environmental factors

作　　者：董博 蔡小培[1] 陈泽林 钟阳龙 路林海 DONG Bo;CAI Xiaopei;CHEN Zelin;ZHONG Yanglong;LU Linhai(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Jinan Rail Transit Group Co.Ltd.,Jinan 250101,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]济南轨道交通集团有限公司,山东济南250101

出　　处：《中南大学学报（自然科学版）》2024年第6期2236-2246,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52178405);中国国家铁路集团有限公司科技研究开发计划项目(K2022G038);山东省交通运输厅科技计划项目(2021B03);京沪高速铁路股份有限公司科技研究项目(京沪科研-2020-13)。

摘　　要：为准确反映无砟轨道早期温度场,本文提出基于等效龄期法的底座板水化放热模型。首先,分析底座板早期热量传递过程,明确早期温度场的关键影响因素;其次,根据混凝土等效龄期成熟度理论,建立基于等效龄期法的底座板早期温度场分析模型;第三,基于有限元软件的子程序开发功能,通过自编程序实现模型内等效龄期水化放热、对流换热、太阳辐射、基础温度等因素的全面真实模拟;最后,对比分析多种环境因素下采用等效龄期法与传统非等效龄期法的底座板早期热学性能差异。研究结果表明:底座板早期温度场的众多影响因素中,太阳辐射的影响最显著;采用等效龄期法得出的底座板早期温度比非等效龄期法普遍更高,温升幅度为2~6℃;使用等效龄期法有效提升了底座板水化放热速率、累计放热量、温度等热学性能的模拟精度,提升幅度可达2%~10%,这表明等效龄期法在无砟轨道早期温度场模拟方面具有较大优势。In order to realize the accurate response of temperature field of early-age ballastless track,a concrete hydration heat release model based on equivalent age method was proposed.Firstly,early heat transfer process of base plate was analyzed,and the key influencing factors of early temperature field were clarified.Secondly,according to theory of equivalent age maturity of concrete,early temperature field analysis model of base plate based on equivalent age method was established.Thirdly,based on the subroutine development function of finite element software,comprehensive real simulation of various factors in analysis model was realized by self-compiled program.These factors include equivalent age hydration heat release,convective heat transfer,solar radiation,base temperature,etc.Finally,early thermal performance differences between equivalent age method and traditional non-equivalent age method under the influence of various environmental factors were compared and analyzed.The results show that the solar radiation has the most significant influence on the early temperature field of the base plate among the influencing factors.In the finite element model,the early temperature of the base plate simulated by the equivalent age method is generally higher than that by the non-equivalent age method,and the temperature rise range is 2-6℃.The use of equivalent age method in the model effectively improves the simulation accuracy of thermal properties such as hydration heat release rate,cumulative heat release and temperature of the base plate,with an improvement range of 2%-10%.In conclusion,the equivalent age method has great advantages in the simulation of early temperature field of ballastless track.

关 键 词：底座板 早龄期 水化反应 等效龄期 温度场 

分 类 号：U213.2[交通运输工程—道路与铁道工程]