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http://dx.doi.org/10.9711/KTAJ.2019.21.1.093

Investigation for the deformation behavior of the precast arch structure in the open-cut tunnel  

Kim, Hak Joon (Dept. of Construction Safety and Disaster Prevention, Daejeon University)
Lee, Gyu-Phil (Integrated Road Management Research Center, Korea Institute of Civil Engineering and Building Technology)
Lim, Chul Won (New Business Development Department, Freyssinet Korea)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.1, 2019 , pp. 93-113 More about this Journal
Abstract
The behavior of the 3 hinged precast arch structure was investigated by comparing field measurements with numerical analyses performed for precast lining arch structures, which are widely used for the open-cut tunnel. According to the field measurements, the maximum vertical displacement occurred at the crown with upward displacements during the backfilling up to the crown of the arch and downward displacements at the backfill height above the crown. The final crown displacement was 19 mm upward from the original position. The horizontal displacement at the sidewall, which had a maximum horizontal displacement, occurred inward of the arch when compacting the backfill up to the crown and returned to the original position after completing the backfill construction. According to the analysis of displacement measurements, economical design is expected to be possible for precast arch structures compared to rigid concrete structures due to ground-structure interactions. Duncan model gave good results for the estimation of displacements and deformed shape of the tunnel according to the numerical analyses comparing with field measurements. The earth pressure coefficients calculated from the numerical analyses were 0.4 and 0.7 for the left and the right side of the tunnel respectively, which are agreed well with the eccentric load acting on the tunnel due to topographical condition and actual field measurements.
Keywords
Open-cut tunnel; Precast lining; 3 hinged; Precast arch structure; Duncan model;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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