Based on the Shenzhen-Zhongshan Link, the transient analytical solution of the steel shell immersed tunnel under the protection of fireproof board was deduced and verified through fire test. Then, the variation of the maximum temperature of the bottom steel shell with the thickness and thermal conductivity of the fireproof board was analyzed and suggestions on the selection of fireproof boards were given. Finally, a fitting formula for the maximum temperature of bottom steel shell was proposed. The results show that: (1) When the thermal contact resistance of the steel-concrete interface and the thermal resistance of cavity are 0.01 m2 °C/W and 0.02 m2 °C/W respectively under the case of 25 mm thick fireproof board, the variation of the analytical solution is consistent with test results, and the peak value is similar. (2) Based on the three-dimensional diagram of --, with 300 °C as the fire resistance limit of structure, the range of the fireproof board parameters is obtained: when reaches 0.14 and 0.4 respectively, shall not be less than 10 mm and 28.38 mm (3) The scatter points obtained from analysis were fitted using quadratic polynomials and linear functions respectively. Considering the accuracy and simplicity, the linear fitting formula is given as = 275.66–7.41*+644.6*.

中文翻译：

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防火板防护钢壳沉管隧道瞬态温度分析及工程应用


以深中线为背景，推导了防火板保护下钢壳沉管隧道的瞬态解析解，并通过防火试验进行了验证。然后，分析了底部钢壳最高温度随防火板厚度和导热系数的变化，并给出了防火板的选择建议。最后提出了底部钢壳最高温度的拟合公式。结果表明：(1)在25 mm厚防火板情况下，钢-混凝土界面接触热阻和空腔热阻分别为0.01 m2 °C/W和0.02 m2 °C/W时，分析溶液的变化与试验结果一致，峰值相似。 (2)根据--三维图，以300℃为结构耐火极限，得出防火板参数范围：分别达到0.14和0.4时，不应小于10mm和 28.38 mm (3) 分别使用二次多项式和线性函数对分析得到的散点进行拟合。考虑到准确性和简单性，线性拟合公式为 = 275.66–7.41*+644.6*。