无砟轨道温度场计算及持续高温天气影响分析  

Temperatures of Ballastless Track and Effect of Continuous Hot Weather

作　　者：康维新 陈帅[1] 魏春城 刘学毅[1] 李佳莉 刘笑凯[1] KANG Weixin;CHEN Shuai;WEI Chuncheng;LIU Xueyi;LI Jiali;LIU Xiaokai(Key Laboratory of High-speed Railway Engineering,Ministry of Education, Southwest Jiaotong University,Chengdu 610031,China;China Design Group Co., Ltd., Nanjing 210001,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]中设设计集团股份有限公司,江苏南京210001

出　　处：《铁道学报》2019年第7期127-134,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(U1434208,51778543)

摘　　要：为研究持续高温天气下无砟轨道温度特性,分析了无砟轨道与大气环境的换热机理并考虑地温影响,推导基于气温、太阳辐射及风速的无砟轨道温度场计算公式。开展无砟轨道温度试验,验证公式准确性,利用该公式计算了2013年杭州地区持续高温天气下无砟轨道温度。结果表明:根据实测气象资料能够准确算得当地无砟轨道温度场;持续高温天气下,地温达到42℃,无砟轨道最大正温度梯度达到100℃/m,道床板中部日平均温度能够达到47.5℃,比平均气温高约15℃;持续高温天气期间,较强的太阳辐射和较高的日平均气温是导致无砟轨道整体温度升高的主要原因。In order to investigate the temperatures of ballastless track under the continuous hot weather, the heat exchange between ballastless track and surroundings was analyzed and the influence of the ground temperatures on the ballastless track temperatures was taken into consideration.Then a solution to calculate the temperature distribution of the ballastless track was developed based on the air temperature, solar radiation and wind speed.A field temperature test of the ballastless track was conducted to verify the accuracy of the above theoretical formula.The temperature characteristics of the ballastless track during the continuous hot weather period in Hangzhou in2013 were analyzed.The results show that the temperature distribution of the ballastless track can be obtained accurately based on the meteorological data.During continuous hot weather when the ground temperature reaches42 ℃, the maximum positive temperature gradient of the ballastless track is100 ℃/m, while the daily mean temperatures in the center of the concrete slab is47.5 ℃, which is15 ℃ higher than the average air temperature.During continuous hot weather, the stronger solar radiation and the higher daily mean temperature are the main factors causing the higher temperature of the ballastless track.

关 键 词：无砟轨道 温度场 地温 持续高温 

分 类 号：U213.21[交通运输工程—道路与铁道工程]