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http://dx.doi.org/10.9711/KTAJ.2017.19.6.999

Evaluation of rock load based on stress transfer effect due to tunnel excavation  

Lee, Jae-Kook (Dept. of Civil and Environmental Engineering, Hanyang University)
Kim, Jung-Joo (Dept. of Civil and Environmental Engineering, Hanyang University)
Rehman, Hafeezur (Dept. of Civil and Environmental Engineering, Hanyang University)
Yoo, Han-Kyu (Dept. of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.19, no.6, 2017 , pp. 999-1012 More about this Journal
Abstract
Theoretical, empirical and numerical methods are used to evaluate the rock load due to tunnelling. Theoretical and empirical methods do not consider ground conditions, tunnel shape, and construction conditions. However, through numerical analysis, it is possible to analyze the displacement and stresses around tunnel due to its excavation, and evaluate the rock load considering ground and construction conditions. The stress transfer ratio(e) which is defined as a ratio of the difference between the major and minor principal stresses to major principal stress is used in order to understand the stress transfer effect around the tunnel excavation using numerical analysis results. The loosend area around tunnel periphery was found based on this approach. The difference of rock load from stress transfer effect was found according to the ground grade. From comparison, rock load obtained from stress transfer effect (e = 10%) were somewhat larger than the results obtained from the critical strain method, but smaller than those obtained from theoretical and empirical methods. The stress transfer effect approach considers the ground condition, tunnel shape; therefore, it can be applied to evaluate the rock load in concrete lining design.
Keywords
Stress transfer ratio(e); Stress transfer effect; Rock load; Principal stresses; Concrete lining;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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