无砟轨道覆盖道砟层保温效果研究  

Study on Thermal Insulation Effect of Ballast Layer Covered with Ballastless Track

作　　者：黄永辉 邱涛 梁爽[1] 陈帅[1] HUANG Yonghui;QIU Tao;LIANG Shuang;CHEN Shuai(Key Laboratory of High-speed Railway Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,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,成都610031

出　　处：《路基工程》2022年第1期103-108,共6页Subgrade Engineering

基　　金：国家自然科学基金项目(51978584)。

摘　　要：温度变化会对无砟轨道轨道板的受力和变形产生显著影响,为降低无砟轨道轨道板的温度效应,通过试验对轨道板上覆盖保温道砟层内部温度进行了监测,推导了道砟层的导温系数和导热系数;研究无砟轨道表面覆盖道砟层的厚度对轨道板上表面温度的影响,提出无砟轨道覆盖道砟保温层的材料选用原则。研究结果表明:道砟层的导温系数可取0.87×10^(−3) m^(2)/h,导热系数可取1.02 kJ/(m·h·℃);道砟保温层厚度越大,无砟轨道轨道板上表面温度变化幅度越小,保温效果越明显;建议选用花岗岩、玄武岩等密度较大的道砟作为无砟轨道的保温材料。The temperature change will have a significant impact on the stress and deformation of the ballastless track slab.In order to reduce the temperature effect of the ballastless track slab,the internal temperature of the track slab covered by the thermal insulation ballast layer was monitored through experiments and the temperature conductivity and thermal conductivity of the ballast layer are deduced.The influence of the thickness of the ballast layer on the surface of the ballastless track on the surface temperature of the track slab is studied,and the material selection principle of the ballastless track covering the ballast insulation layer is proposed.The research results show that:the temperature conductivity of the ballast layer can be 0.87×10^(−3) m^(2)/h,and the thermal conductivity can be 1.02 kJ/(m·h·℃);the greater the thickness of the ballast insulation layer,the smaller the change range of the surface temperature of the ballastless track slab,the more obvious the thermal insulation effect;it is recommended to use granite,basalt,and other dense ballasts as the thermal insulation material for the ballastless track.

关 键 词：轨枕支承式 无砟轨道 覆盖道砟保温层 导温系数 导热系数 

分 类 号：U216.41[交通运输工程—道路与铁道工程]