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Han-eol Kim, Sang-gui Ha, Hafeezur Rehman and Han-kyu Yoo
Mechanical methods of tunnel excavation are widely used because of their high excavation output, and the selection of appropriate technology depends on ground composition and project-related features. Compared with tunnel boring machines (TBMs) and roadh...
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Han-eol Kim, Kyoung-min Nam, Hafeezur Rehman, Tae-su Kyeon and Han-kyu Yoo
Rock fragments obtained by excavation can provide information for evaluating the excavation efficiency, for which the coarseness index (CI) and particle size parameters (d50, dMPS, and d') are used. However, CI depends on the number and size of the sieve...
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Jonguk Kim, Jung-joo Kim, Hafeezur Rehman and Hankyu Yoo
The non-open-cut method is used for constructing tunnels under existing roads without blocking traffic. Various non-open-cut methods use pipe roofs made of medium- and large-diameter steel pipe piles. However, the risk of ground settlement or heave is in...
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