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http://dx.doi.org/10.7843/kgs.2007.23.8.87

Ground Behavior and Reinforcing Methods of NATM Tunnel through Deep Weathered Zone  

Chun, Byung-Sik (Dept. of Civil Engrg., Hanyang Univ.)
Song, Seung-Hoon (Kumho Engrg. & Construction)
An, Jung-Whan (Geotechnical Division, Dongho Co., Ltd.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.8, 2007 , pp. 87-95 More about this Journal
Abstract
This study analyzed ground settlement and ground stress depending on tunnel excavation and the ground reinforcing grouting methods for double line road tunnel through deep weathered zone. Diameter of double line road tunnel was approximately 12m and umbrella arch method and side wall reinforcing grouting were applied. The ring-cut split excavation method and CD-cut excavation method for excavation method were applied. Analyses of failure rate and vertical stress ratio show that the tunnel for which the height of the cover (H) was higher than four times the diameter, can be considered a deep tunnel. Comparisons of various excavation and ground reinforcement methods showed that CD-cut method results in lower surface and crown settlement, and lower failure rate than that obtained by Ring-cut split method. In addition, the side wall reinforcing grouting resulted in reduction of tunnel displacement and settlement.
Keywords
CD-cut method; Deep tunnel; Ring-cut split method; Side wall reinforcing grouting; Weathered zone;
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