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Geomechanics and Engineering
  Volume 21, Number 2, April25 2020, pages 95-102

Structure damage estimation due to tunnel excavation based on indoor model test
Kyoungmin Nam, Jungjoo Kim, Dongyoup Kwak, Hafeezur Rehman and Hankyu Yoo

    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 pre-attached 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.
Key Words
    indoor model test; settlement trough; forced displacement; frame structure; damage estimation chart
Kyoungmin Nam, Dongyoup Kwak, Hafeezur Rehman and Hankyu Yoo: Department of Civil and Environmental System Engineering, Hanyang University, Ansan 15588, South Korea

Jungjoo Kim: Structural and Seismic Technology Group, KEPCO Research Institute, 105 Munji-ro Yuseong-Gu, Daejeon 34056, South Korea

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