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Study on the Effect of Bolt and Sub-bench on the Stabilization of Tunnel Face through FEM Analysis  

Kim, Sung-Ryul (동신기술개발주식회사 기술연구소)
Yoon, Ji-Sun (인하대학교 환경토목공학부)
Publication Information
Tunnel and Underground Space / v.18, no.6, 2008 , pp. 427-435 More about this Journal
Abstract
In this paper, review was made for the excavation method and optimum bench length for unstable tunnel face in case of rock classification type V in order to make the best use of in-situ bearing capacity. 3D FEM analyses were performed to investigate the influences on the tunnel face and adjacent area with regard to the pattern and number of bolts when face bolts were used as a supplementary measure. As a result of this study, full section excavation method with sub-bench is effective in reducing the displacement greatly due to early section closure. Displacement-resistant effects in accordance with the bolting patterns are grid type, zig-zag type and then circular type in order of their effect. And horizontal extrusion displacement of tunnel face reduces as the number of bolts increase. A grid type face bolt covering $1.5m^2$ of tunnel face could secure the face stability in case of full section excavation method with sub-bench.
Keywords
Stability of a tunnel face; Face bolt; 3D FEM analysis; Sub-bench;
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Times Cited By KSCI : 1  (Citation Analysis)
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