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依据对隧道衬砌材料和构件进行实际烧损的试验成果，重点分析了不同火灾温度场与不同烧蚀时间对隧道衬砌力学性能的变化影响；在此基础上提出了隧道衬砌火灾损伤等级的划分标准与耐火极限时间。
Based on the actual test results of tunnel lining materials and components, the influence of different fire temperature fields and different ablation times on the mechanical properties of tunnel lining is analyzed emphatically. Based on this, the classification criteria of tunnel lining fire damage grades And fire resistance limit time.