地铁迷流对隧道衬砌耐久性的影响  

Stray current in subway affects the durability of tunnel lining

作　　者：贺丽娟[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《现代隧道技术》2006年第6期29-34,44,共7页Modern Tunnelling Technology

摘　　要：根据地铁迷流对金属发生电化学腐蚀的机理,研究了钢筋混凝土试件在土壤介质中受外加直流电时的腐蚀产物对混凝土产生挤压应力而引起混凝土开裂破坏的原因及相关因素,从而证实了地铁迷流对隧道衬砌耐久性的严重影响。According to the mechanism of electrochemical corrosion of rebars due to anodic oxidization in reinforced concrete structures, this paper deals with the simulation of soil corrosive media in which a concrete specimen is positioned. The corrosion of rebars in the specimen was produced under different external electric potentials. The rust of rebars produced compressive stresses in concrete which caused cracks in it and seriously affected the durability of tunnel lining.

关 键 词：地铁迷流 电化学腐蚀 隧道衬砌 耐久性 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]