（长安大学公路学院 西安 710064）
【提要】 铜黄公路涵洞衬砌混凝土的火灾持续时间约9h，最高温度超过1 000℃。衬砌混凝土的损伤是不均匀的，根据残留受火混凝土的颜色、裂隙发育特征及疏松程度，将其损伤程度划分为轻度损伤、中等损伤、严重损伤和破坏4个等级，依此判别其残余强度。衬砌混凝土的局部损伤特征受火灾发生时的火源、燃料供给、受火区段的地形、通风等因素的影响。
【关键词】 衬砌混凝土 火灾 损伤特征 铜黄公路
Damage Features of the Lining Concrete  After Conflagration/Ma Jianqin，    Chen Wanchun，    Liu Yuan(College of Highway, Chang'an University, Xi'an 710064,China)
Abstract:Based upon the damage features of the lining concrete of a culvert in
TongHuang highway after conflagration, it is concluded that the conflagration
 had lasted about nine hours and its highest temperature exceeded 1 000℃. T
he lining concrete endured damage in varying degrees, which are ranked into four
 types, i.e. gently damaged, moderately damaged, seriously damaged and thoroughl
y damaged, according to their colors and fractural features. The damage degree c
an be used to identify the residual strength of the concrete after conflagration
. It is concluded that the damage features of the lining concrete are related to
 fire source, fuel supplying mode, landscape and ventilation condition of the co
nflagration.
Keywords:lining concrete;  conflagration;   damage feature;   TongHuang highway