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A Numerical Study on the Rock Fragmentation by TBM Cutter Penetration  

백승한 (한양대학교 대학원 지구환경시스템공학과)
문현구 (한양대학교 공과대학 지구환경시스템공학과)
Publication Information
Tunnel and Underground Space / v.13, no.6, 2003 , pp. 444-454 More about this Journal
Abstract
Rock fragmentation technique by cutter penetration has widely been used in the mechanical tunnel excavation. Microcracks propagate and interact because of locally concentrated high stress induced by cutter penetration. which is caused by heterogeneity of rocks. In this study Weibull distribution function and degradation index are used to consider the strength heterogeneity of a rock and the degradation of rock properties after failure. Through the numerical analyses, it is shown that the lateral pressure has an important influence on the rock fragmentation. In the single cutter penetration, large chips are formed as lateral pressure increase. The cutter spacing is also an important factor that affects the rock fragmentation in the double cutter penetration. The fragmentation efficiency of the double cutter penetration is better when cutter spacing is 70 mm than 40 mm and 100 mm. From the results, it is expected that this study can be applied to a TBM tunnel design by understanding of chipping process and mechanism of rock due to cutter penetration.
Keywords
Cutter penetration; Rock fragmentation; Heterogeneity; Weibull distribution; Degradation index; Lateral pressure; Cutter spacing;
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