STUDY ON STRAY CURRENT INTENSITY AND ITS EFFECT ON SUBWAY STRUCTURES DURABILITY

摘要

During the motion of subway train operated by direct current, there is part of the direct current, named leaking current or stray current, leaking into underground soil and structures. The stray current could cause steel bars in reinforced concrete elements of underground structures to corrode. The reinforce concrete elements corroded by stary current decreases their intensity and durability. Based on the analyses of the formation of stray current and the mechanism of reinforcement corrosion in Metro lines, this paper compares major influencing factors of Metro stray current intensity and their influences extent. The durability of underground or Metro structures influenced by Metro stray current is also analyzed in this paper. The results of this paper can be references to the subway structure durablity design.