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Behavior of double lining due to long-term hydraulic deterioration of drainage system

  • Shin, Jong-Ho (Department of Civil Engineering, Konkuk University) ;
  • Lee, In-Keun (Institute of Land and Housing, LH Cooperation) ;
  • Joo, Eun-Jung (Department of Civil Engineering, Konkuk University)
  • Received : 2014.04.03
  • Accepted : 2014.10.29
  • Published : 2014.12.25

Abstract

The hydraulic deterioration of the drainage system in tunnel linings is one of the main factors governing long-term lining-ground interactions during the lifetime of tunnels. Thus, in the design procedure of a tunnel below the groundwater table, the possible detrimental effects associated with the hydraulic deterioration should be addressed. Hydraulic deterioration in double-lined tunnels can occur because of reasons such as clogging of the drainage layer and drain-pipe blockings. In this study, the coupled mechanical and hydraulic interactions between linings due to drain-pipe blockings are investigated using the finite-element method. A double-lined structural model incorporating hydraulic behavior is developed to represent the coupled structural and hydraulic behavior between the linings and drainage system. It is found that hydraulic deterioration hinders flow into the tunnel, causing asymmetric development of pore-water pressure and consequent detrimental effects to the secondary lining.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea

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