双块式无砟轨道早期温度场模拟  

Early Temperature Field Simulation of Double-Block Ballastless Track

作　　者：赵坪锐[1] 邓非凡[1] 丁晨旭[1] 刘观 牛晨[1] 

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]中国铁建国际集团有限公司,北京100855

出　　处：《铁道建筑》2016年第5期10-14,共5页Railway Engineering

基　　金：国家重点基础研究发展计划(973计划)(2013CB036202);国家自然科学基金(U1434208);中国铁路总公司科技研究开发计划(Z2013G001;2014G001-A)

摘　　要：建立考虑时变水化热参数的双块式无砟轨道有限元模型,研究了不同铺设条件和不同季节情况下,外界环境温度与内部水化热对道床板早期温度场的影响特征。结果表明:水化热的影响主要集中在浇筑后的72 h内,在水化热的影响下,道床板内部温度较表面高,表面容易产生拉应力甚至出现裂缝,应在施工后的72 h内洒水养护;当施工温度降低时,道床板内部温度分布将更不均匀,应采取适当保温措施提高表面温度,以降低道床板温度不均匀程度;72 h后,水化热的影响减弱,道床板内部温度主要受控于外界环境温度。Double-block ballastless track finite element model was established based on the time-varying hydration heat parameter.The influence characteristics of ambient temperature and internal hydration heat on early temperature field of track slab were studied in different laying conditions and different seasons.The results show that the hydration heat effect mainly concentrates within the 72 h after pouring,the internal temperature of track slab is higher than surface temperature under the influence of hydration heat and the surface is prone to produce tensile stress or crack,which means the sprinkling maintenance should be implemented within 72 h after construction,the internal temperature distribution of track slab would be more inhomogeneous when construction temperature decreases and the appropriate insulation measures should be taken to improve the surface temperature for reducing the uneven level of track slab temperature,the internal temperature of the track slab is mainly controlled by ambient temperature with the impact of hydration heat reducing after 72 h.

关 键 词：双块式无砟轨道 道床板 早期温度场 瞬态分析 水化热 环境温度 

分 类 号：U213.244[交通运输工程—道路与铁道工程]