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Application of the guideline for overbreak control in granitic rock masses in Korean tunnels

Title
Application of the guideline for overbreak control in granitic rock masses in Korean tunnels
Author
문현구
Keywords
Tunnel blasting; Overbreak control; Guideline; Computerized drilling jumbo
Issue Date
2013-04
Publisher
Elsevier Science LTD
Citation
Tunnelling and Underground Space Technology, Apr 2013, 35, P.67-77
Abstract
Overbreak, one of the most important factors in the evaluation of the results of a tunnel blasting, has been a challenging target for many tunnelling engineers as it is directly connected with construction cost. In Korea where the space produced by overbreak should be filled with shotcrete or the lining concrete, various efforts have been made to reduce overbreak. In connection with this, a guideline for overbreak control has been suggested by the author in a previous study based upon full scale field tests. The guideline provides the instructions as to how to draw a contour line, to drill blasting holes, and to charge explosives to reduce overbreak.In this study, field investigations and tests are carried out to check the feasibility of the suggested guideline for four tunnels in Korea. The average overbreak for the cases performed according to the guideline is compared with that for usual cases. The results from the comparison show that the guideline is generally working well and the overbreak is decreased by 10-77%, and it is analyzed that the overbreak reduction corresponds to approximately 65,000 US$ to 130,000 US$ in a support cost reduction. It is concluded that not only the use of a computerized drilling jumbo but also the carefully performed operations are important for the overbreak control. (C) 2012 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0886779812001812?via%3Dihubhttp://hdl.handle.net/20.500.11754/52417
ISSN
0886-7798
DOI
10.1016/j.tust.2012.11.008
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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