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http://dx.doi.org/10.9711/KTAJ.2014.16.4.373

Deformation behavior of tunnels crossing weak zone during excavation - numerical investigation  

Yoo, Chungsik (Dept. of Civil Engineering, Sungkyunkwan Univ.)
Park, Jung-Gyu (R&D Center, POSCO E&C, Co., Ltd.)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.16, no.4, 2014 , pp. 373-386 More about this Journal
Abstract
This paper concerns the deformation behavior of tunnels crossing weak zone during excavation. A three dimensional finite element model was adopted in order to conduct a parametric study on the orientation of weaj zone in terms of strike and dip angle relative to the tunnel longitudinal axis. The results of the analyses were then analyzed so that the tunnel displacements in terms of the ratios between the crown settlement and springline displacement can be related to the orientation of the weak zone. The results indicate that the displacement ratios between the tunnel crown and springline tend to quantitatively change when a weak zone exists near or ahead of the tunnel suggesting that the displacement ratios can be effectively used to predict the weak zone during tunnelling. Practical implications of the findings are discussed.
Keywords
Drill and blast tunnel; Finite element analysis; Tunnel instrumentation; weak zone; Deflection curve; Trend line;
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Times Cited By KSCI : 2  (Citation Analysis)
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