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http://dx.doi.org/10.9720/kseg.2017.1.81

Prediction of Preceding Crown Settlement Using Longitudinal Displacement Measured on Tunnel Face in Fault Zone  

Yun, Hyun-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Do, Kyung-Ryang (Daelim Industrial Company, Limited)
Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.27, no.1, 2017 , pp. 81-90 More about this Journal
Abstract
Preceding displacements in tunnel are difficult to predict since the measurements of displacements after excavation can not be performed immediately. In the present study, The longitudinal displacements which can be measured immediately after excavation are used to predict the crown settlements occurring before excavation only if fault is located at the tunnel crown. Three-dimensional finite element analysis was conducted using 28 numerical models with various fault attitudes to analyze the correlation between the longitudinal displacements on tunnel face and preceding crown settlements. The results, $L_{face}/C$ ratio show 2~12% in the drives with dip models and 2~13% in the drives against dip models individually. In addition, each model has a certain $L_{face}/C$ ratio. The result of the regression analysis show that the coefficient of determination is over 0.8 in most models. Therefore, crown settlements occurring before excavation can be predicted by analyzing the longitudinal displacements occurring on tunnel faces.
Keywords
preceding displacements; longitudinal displacement on tunnel face; preceding crown settlement; fault; $L_{face}/C$ ratio;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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