Evaluation of the Efficiency of the Umbrella Arch Method in Urban Tunneling Subjected to Adjacent Surcharge Loads

Since urban tunnels constructed in the weak ground at shallow depth are highly sensitive to the stress level, surcharge loads resulting from adjacent buildings can dramatically increase the induced stresses and settlements, and even failure of the buildings can take place. In this study, utilizing three-dimensional finite element models, the efficiency of the umbrella arch method (UAM) on stabilizing the tunnels subjected to the surcharge loading is investigated. The analysis considers the actual field conditions of implementing the UAM and the primary supporting system. For the surcharge loads applied in this study, the analysis results showed that using the UAM can efficiently control the tunnel crown and ground surface settlements by at least 48% and 33%, respectively. Consequently, reinforcing the tunnels using UAM is one of the effective ways to overcome the severe conditions, in terms of safety and stability, in urban tunneling under existing adjacent buildings.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 258-268
  • Monograph Title: Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure

Subject/Index Terms

Filing Info

  • Accession Number: 01732299
  • Record Type: Publication
  • ISBN: 9780784482797
  • Files: TRIS, ASCE
  • Created Date: Feb 28 2020 10:11AM