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Evaluation of Support Requirements for the Single Shell Tunnels from the Case Study of Rock Mass Classifications  

Kim Hak-Joon (Daejeon University, Dept. of Geological Engineering)
Lee Seong-Ho (Korea Institute of Construction Technology)
Shin Hyu-Seong (Korea Institute of Construction Technology)
Bae Gyu-Jin (Korea Institute of Construction Technology)
Publication Information
The Journal of Engineering Geology / v.16, no.3, 2006 , pp. 283-291 More about this Journal
Abstract
Shotcrete is used as a permanent lining in single shell tunnels even though shotcrete has been used as a temporary lining in NATM tunnels. Therefore, the accurate evaluation of strength parameters is very crucial because the reliable estimation of loads acting on the shotcretes is necessary to maintain the stability of tunnels. The evaluation of strength parameters of the ground far the single shell tunnels should be investigated to adapt the method in Korea because the geological condition of Korea is different from that of other country. Rock classification and strength parameters obtained from 25 tunnel sites were investigated for this study. Support types fur the different rock classes are suggested for the single shell tunnels in Korea based on the NMT because Q-system has been widely used in Korea. The support types in terms of both Q and RMR values are given based on the correlation of Q and RMR values obtained from the case studies.
Keywords
single shell tunnel; evaluation of strength parameters; parameters of rock classification; support types;
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