Simplified calculation of temperature field in high-speed railway ballastless track structure

A simplified temperature field equation was derived from the thermal transmission theory and the simplified meteorological boundary condition to calculate the temperature distribution in high-speed railway ballastless track structure (BTS) exposed to a periodic atmospheric environment. The measured temperatures of CRTS-II BTS in Beijing-Shanghai high-speed railway were used to validate the derived temperature field equation. Validation results showed that the calculated temperature distribution based on the derived equation was generally consistent with the measured one. Analysis of temperature distribution revealed that it was distinctly affected by the atmospheric environment, especially in depth 0-0.2 m of BTS.The daily maximum value of positive temperature gradient appeared at 1: 00~3: 00 pm and it is obviously affected by the thickness of BTS. The maximum value of positive temperature gradient varies with seasons, being largest in summer and least in winter. ©, 2015, Zhejiang University. All right reserved.