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http://dx.doi.org/10.9720/kseg.2016.2.187

Prediction of Fault Zone ahead of Tunnel Face Using Longitudinal Displacement Measured on Tunnel Face  

Song, Gyu-Jin (Department of Earth and Environmental Sciences, Chungbuk National University)
Yun, Hyun-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.26, no.2, 2016 , pp. 187-196 More about this Journal
Abstract
We conducted three-dimensional finite element analysis to predict the presence of upcoming fault zones during tunneling. The analysis considered longitudinal displacements measured at tunnel face, and used 28 numerical models with various fault attitudes. The x-MR (moving range) control chart was used to analyze quantitatively the effects of faults distributed ahead of the tunnel face, given the occurrence of a longitudinal displacement. The numerical models with fault were classified as fault gouge, fault breccia, and fault damage zones. The width of fault cores was set to 1 m (fault gouge 0.5 m and fault breccia 0.5 m) and the width of fault damage zones was set to 2 m. The results, suggest that fault centers could be predicted at 2~26 m ahead of the tunnel face and that faults could be predicted earliest in the 45° dip model. In addition, faults could be predicted earliest when the angle between the direction of tunnel advance and the strike of the fault was smallest.
Keywords
tunnel face; longitudinal displacement; prediction of faults; x-MR control chart;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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