铁道科学与工程学报2017，Vol.14Issue(10)：2082-2090,9.
基于早期温度应力的道床板施工方式
Study about the construction methods of bed slab based on the early temperature stress
摘要
Abstract
Considering the heat of hydration, shrinkage of concrete, elasticity modulus and other time-variable parameters, a finite element model of early transient analysis of temperature stress of two-block ballastless track bed was established. The distribution of early temperature stress was then analyzed under the combined action of internal heat of hydration and external ambient temperature of bed slab. The different construction seasons, time and supporting conditions of steel model and their influence on early temperature stress of bed slab was compared, the results show that heat of hydration and external ambient temperature have a greater influence on early temperature stress of bed slab. The internal stress is mainly controlled by the heat of hydration, while surface stress is mainly controlled by ambient temperature. Side of sleeper is the weak point which is prone to occur early temperature cracks. When the construction temperature decreases, the side and the top of bed slab is easy to crack. In order to reduce the development of early crack of concrete, it is necessary to elongate from removal time when pouring in evening, at least 3 days at low temperature, and at least 4 days at high temperature after pouring.关键词
双块式无砟轨道/道床板/早期温度场/温度应力/养护Key words
double-block ballastless track/bed slab/early temperature field/temperature stress/maintenance分类
交通工程引用本文复制引用
赵坪锐,向芬,邓非凡,刘观,龚闯..基于早期温度应力的道床板施工方式[J].铁道科学与工程学报,2017,14(10):2082-2090,9.基金项目
国家重点基础研究发展计划(973计划)项目(2013CB036202) （973计划）
国家自然科学基金资助项目(U1434208) （U1434208）
中国铁路总公司重大项目(Z2013 G001.2014G001-A) （Z2013 G001.2014G001-A）
