To study the durability of shield tunnel concrete segment under coupling multi-factors, the durability and degradationlaw of reinforced concrete segments under the joint action of carbonation, sulfate, chloride salt and stray currentwas studied by accelerated environmental and direct current (DC) power simulation test. The results show that the presenceof the stray current not only accelerates the migration of chloride ions to the concrete, but also makes chlorine iongradually converge to the steel surface. The steel corrosion near the corrosion solution on the up surface of segment ismore serious than the steel corrosion near the carbon dioxide on the lower surface. The interaction of chlorine ions andstray current primarily controls the durability of the segment.
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