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An Experimental Study on the Prediction of Progressive Cracking around Tunnel Fallout  

Lee, Jun-S. (한국철도기술연구원)
SaGong, Myung (한국철도기술연구원)
Ahn, Sung-Kwon (한국철도기술연구원)
Yoo, Sang-Geon (삼림엔지니어링)
Song, Suk-Jun (SOC건설엔지니어링)
Publication Information
Journal of the Korean Society for Railway / v.12, no.5, 2009 , pp. 811-818 More about this Journal
Abstract
An estimation method of the fallout volume of a tunnel under construction is proposed based on an empirical method called bulking factor. For this, the main causes of the tunnel fallout are investigated and the scale of the fallout which is not accessible is considered. The calculated height of the fallout area is compared with borehole core data and the accuracy and efficiency of the proposed method is demonstrated. Another experimental approach on the detection of a progressive cracking around the tunnel fallout is provided based on an acoustic emission method. From the field tests near the tunnel fallout, it is shown that additional progressive cracking of the reinforced area is not foreseen and the effectiveness of the reinforcement is proven.
Keywords
Fallout; Bulking factor; Acoustic emission;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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