Risk Factor Identification and Evaluation on SPB Shield Underneath Existing Railroad Settlement

Regarding the situation of slurry pressure shield tunneling underneath existing operating railway, traditional risk assessment method takes settlement railroad as evaluation objective cannot determine development trend. Therefore, a model based on set pair analysis was proposed. Firstly, according to Slurry Pressure Balance construction mechanism, source identification process and operation carried out, index factor system that leads formed. The importance each in optimized by rough set, then five-element connection number with objectively improved weights obtained. Finally, assessed level caused tunneling. This is suitable for actual subway tunnel, which consistent site survey results has reference significance similar projects.