Geomechanics and Engineering

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Significance of nonlinear permeability in the coupled-numerical analysis of tunnelling

  • Kim, Kang-Hyun (Department of Civil Engineering, Konkuk University) ;
  • Kim, Ho-Jong (Disaster Prevention Research Division, National Disaster Management Research Institute) ;
  • Jeong, Jae-Ho (Department of Civil Engineering, Konkuk University) ;
  • Shin, Jong-Ho (Department of Civil Engineering, Konkuk University)
  • Received : 2019.12.11
  • Accepted : 2020.03.02
  • Published : 2020.04.25
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Abstract

The inflow rate is of interest in the design of underground structures such as tunnels and buried pipes below the groundwater table. Soil permeability governing the inflow rate significantly affects the hydro-geological behavior of soils but is difficult to estimate due to its wide range of distribution, nonlinearity and anisotropy. Volume changes induced by stress can cause nonlinear stress-strain behavior, resulting in corresponding permeability changes. In this paper, the nonlinearity and anisotropy of permeability are investigated by conducting Rowe cell tests, and a nonlinear permeability model considering anisotropy was proposed. Model modification and parameter evaluation for field application were also addressed. Significance of nonlinear permeability was illustrated by carrying out numerical analysis of a tunnel. It is highlighted that the effect of nonlinear permeability is significant in soils of which volume change is considerable, and particularly appears in the short-term flow behavior.

Keywords

Acknowledgement

Supported by : Ministry of Land, Infrastructure and Transport

This research was supported by Development of Design and Construction Technology for Double Deck Tunnel in Great Depth Underground Space (19SCIP-B089409-06) from Construction Technology Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government.

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