A series of simulations with different heat release rates (HRRs) are conducted in a full-scale horseshoe-shaped tunnel model. Thermocouples are arranged in 21 cross-sections of the tunnel to obtain entire temperature field. The prediction formulas of the ceiling maximum temperature and the longitudinal temperature attenuation beneath the ceiling are obtained, which are consistent with the model of Albert and Gong. It is found that the dimensionless transverse temperature rise distribution under the semicircular ceiling conforms to the Boltzmann curve, but the coefficients of the fitting formula are different for the near field zone and the far field zone. Transverse temperature distribution in the sidewall part can be regarded as constant, which is equal to the temperature at the bottom of semicircular ceiling in most engineering applications. A prediction model is established to estimate the temperature of each position of tunnel structure. It provides a more accurate and detailed temperature field prediction method for tunnel fire prevention and structural damage research.

在全尺寸的马蹄形隧道模型中进行了一系列具有不同放热率（HRR）的模拟。热电偶布置在隧道的21个横截面中，以获得整个温度场。得到了天花板最高温度和天花板下方纵向温度衰减的预测公式，与Albert和Gong的模型一致。结果表明，半圆形顶棚下无量纲的横向温升分布符合玻尔兹曼曲线，但近场区和远场区的拟合公式系数不同。在大多数工程应用中，侧壁部分的横向温度分布可以认为是恒定的，它等于半圆形天花板底部的温度。建立预测模型以估计隧道结构每个位置的温度。为隧道防火和结构破坏研究提供了一种更准确，更详细的温度场预测方法。