Geomechanics and Engineering

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Structure damage estimation due to tunnel excavation based on indoor model test

  • Nam, Kyoungmin (Department of Civil and Environmental System Engineering, Hanyang University) ;
  • Kim, Jungjoo (Structural and Seismic Technology Group, KEPCO Research Institute) ;
  • Kwak, Dongyoup (Department of Civil and Environmental System Engineering, Hanyang University) ;
  • Rehman, Hafeezur (Department of Civil and Environmental System Engineering, Hanyang University) ;
  • Yoo, Hankyu (Department of Civil and Environmental System Engineering, Hanyang University)
  • Received : 2019.12.11
  • Accepted : 2020.03.02
  • Published : 2020.04.25
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Abstract

Population concentration in urban areas has led traffic management a central issue. To mitigate traffic congestions, the government has planned to construct large-cross-section tunnels deep underground. This study focuses on estimating the damage caused to frame structures owing to tunnel excavation. When constructing a tunnel network deep underground, it is necessary to divide the main tunnel and connect the divergence tunnel to the ground surface. Ground settlement is caused by excavation of the adjacent divergence tunnel. Therefore, predicting ground settlement using diverse variables is necessary before performing damage estimation. We used the volume loss and cover-tunnel diameter ratio as the variables in this study. Applying the ground settlement values to the settlement induction device, we measured the extent of damage to frame structures due to displacement at specific points. The vertical and horizontal displacements that occur at these points were measured using preattached LVDT (Linear variable differential transformer), and the lateral strain and angular distortion were calculated using these displacements. The lateral strain and angular distortion are key parameters for structural damage estimation. A damage assessment chart comprises the "Negligible", "Very Slight Damage", "Slight Damage", "Moderate to Severe Damage", and "Severe to Very Severe Damage" categories was developed. This table was applied to steel frame and concrete frame structures for comparison.

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 (14SCIP-B088624-01) from Construction Technology Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government.

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