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http://dx.doi.org/10.9711/KTAJ.2014.16.3.299

Assessment of minimum pillar width and reinforcement of parallel tunnel using numerical analysis and field monitoring  

An, Yong-Koan (Dept. of Geotechnical, Highcon Engineering Consultants)
Kong, Suk-Min (Dept. of Civil Engineering, Seoul National University of Science & Technology)
Lee, Yong-Joo (Dept. of Civil Engineering, Seoul National University of Science & Technology)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.16, no.3, 2014 , pp. 299-310 More about this Journal
Abstract
Nationally, tunnel and underground constructions are necessary for the environmental sustainability and the efficient use of land space. For the importance of eco-friendly circumstances, 2-arch or large road tunnel has been designed so far. However, such a 2-arch or large tunnel has problems in terms of cost, constructability, construction period, and maintenance. Therefore, in this study, tunnel behavior and stability of rock pillar according to the pillar width and cover depth for parallel tunnels are investigated by performing FE analysis and using empirical formula. According to the results, Rock pillar is reinforced for distributed vertical load by Tie-Bolt due to unpredicted ground deformation, and the reinforced rock pillar's behaviour from the FE analysis shows a quite good agreement with field measurement. According to ground conditions, if the pillar width of the parallel tunnels is reduced, it can be more efficient in use of the tunnel space compared to previous tunnels.
Keywords
Parallel tunnel; Numerical analysis; Empirical formula; Pillar width; Field measurement;
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Times Cited By KSCI : 3  (Citation Analysis)
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