Geomechanics and Engineering

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Stability evaluation of a double-deck tunnel with diverging section

  • La, You-Sung (Department of Civil and Environmental Engineering, Dongguk University) ;
  • Kim, Bumjoo (Department of Civil and Environmental Engineering, Dongguk University)
  • Received : 2019.12.04
  • Accepted : 2020.03.03
  • Published : 2020.04.25
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Abstract

Due to the various restrictions and problems related to the construction of new roads in urban areas, underground road construction has been receiving a great deal of attention in the field of tunnel engineering. In this study, a double-deck road tunnel with a diverging section was analyzed for the evaluation of its stability. Both numerical analysis and scale model tests were performed, the results were used to develop a stability evaluation method for double-deck tunnels with diverging sections constructed in rocks by NATM. From regression analyses conducted on the results of the numerical analysis, an equation and a chart were derived, these tools allow us to obtain the strength/stress ratio (SSR) for double-deck road tunnels with a diverging tunnel in various diverging conditions quickly and accurately. These tools have great potential to help engineers evaluate the stability of double-deck tunnels in the preliminary design stage.

Keywords

Acknowledgement

Supported by : Korea Agency for Infrastructure Technology Advancement

This research was supported by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport of the Korean government. (Project Number: 16SCIP-B108153-02).

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