无砟轨道覆盖道砟层保温效果研究

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-...

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

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 m2/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.