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  Case Study on the Application of Conventional Tunneling Method in Backfilled Ground Condition

  This study is about the tunnel construction by conventional tunneling method and the ground reinforcement which was formed by the backfill soil. The site is adjacent to railway track and it was backfilled under the emergency condition due to the collapse of temporary earth retaining structures(TERS). The failure surface was along the hidden discontinuity layer under the existing railway track. After the quick ground backfill, the underground construction method of some section was changed from Cut-and-Cover method to conventional tunneling method. For the supporting method, Jet Grouting was used on the ground level in order to increase the stiffness of the soil. However, excessive groundwater inflow and a lot of cavities were found. This is because of the flow line formed in the ground and the lack of soil compaction by the fast work under the urgent situation. Moreover, due to the high velocity of the groundwater flow, the effect of grouting was not sufficient. To overcome these problems, the Pack Micropile for ground reinforcement was applied because it could resist a lot of quantity and high velocity of groundwater inflow. As a result, the construction was completed safely securing the stabilities of the tunnel and the existing railway line.

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