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（長(zhǎng)安大學(xué)公路學(xué)院 西安 710064）
【提要】 銅黃公路涵洞襯砌混凝土的火災(zāi)持續(xù)時(shí)間約9h，最高溫度超過(guò)1 000℃。襯砌混凝土的損傷是不均勻的，根據(jù)殘留受火混凝土的顏色、裂隙發(fā)育特征及疏松程度，將其損傷程度劃分為輕度損傷、中等損傷、嚴(yán)重?fù)p傷和破壞4個(gè)等級(jí)，依此判別其殘余強(qiáng)度。襯砌混凝土的局部損傷特征受火災(zāi)發(fā)生時(shí)的火源、燃料供給、受火區(qū)段的地形、通風(fēng)等因素的影響。
【關(guān)鍵詞】 襯砌混凝土 火災(zāi) 損傷特征 銅黃公路
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