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  Water Leakage Characteristics in Deteriorating Steel Segments of Shield Tunnels

  In shield tunnels with steel segments, water leakage occurs due to defects caused by deterioration of those segments. However, a secondary lining that generally covers the steel segments makes direct inspection of the segments difficult. This study focuses on clarifying the deterioration characteristics of the steel segments and the causes of water leakage. We investigated seven communication shield tunnels in Japan. Investigation results show that the macroscopic corrosion rate of the main girders was less than approximately 0.024 mm/year and that for the skin plates was less than approximately 0.0094 mm/year, although there was localized corrosion. Water leakage was observed from joints and pitting corrosion on the skin plates. Pitting corrosion was observed especially in tunnels where the chloride ion concentration of the leaked water was high. Previously it was considered that water leakage was due to joint deterioration; however, we find that it is also caused by pitting corrosion of the skin plates. These results are considered important to the study of water leakage treatment methods.

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