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Utility tunnels have been employed in Korea since the 1970s and start to make trouble with structural safety and serviceability. Recently, tunnel enlargement has consequently been proposed due to the impending problems. However there are little st udy on box type u tility tunnels except traffic tunnels. A 2D finite element analysis was conducted to evaluate ground behavior which depends on enlargement size and stiffness by one-side enlargement of the utility tunnel. Settlement scale increased with larger enlargement size and less stiff ground conditions. The observed settlement characteristics due to enlargement are similar to that suggested by Clough & Schmidt (1981). The settlement width is more affected by enlargement size than ground condition.Keywords: Box-type tunnel, Tunnel enlargement, Ground settlement behavior, Numerical analysis  : 1970               .                            .   2                  .           .      Clough & Schmidt (1981)   ,          .:  ,  ,  , Copyright ⓒ2016, Korean Tunnelling and Underground Space Association

The numerical study on the ground settlement behavior of box type tunnel enlargement