Abstract:

In the paper, the major quality defects occurring during the construction of shield tunnels are presented, the causes for the defects are analyzed and relevant countermeasures are recommended. The analysis indicates that most of the quality defects occurring during the construction of shield tunnels are common ones that are interrelated with each other and that the construction technologies and construction operations are the major factors responsible for the quality defects of shield tunnels.

Key words: shield tunnel  , Metro construction  , quality defect