한국지반공학회:학술대회논문집 (Proceedings of the Korean Geotechical Society Conference)
- 한국지반공학회 2005년도 지반공학 공동 학술발표회
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- Pages.198-209
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- 2005
터널발파시 천공상태 평가를 통한 여굴 저감방안 연구
A Study on Overbreak Control Methods by Evaluating Drilling Conditions in Tunnel Blasting
- Kim, Yang-Kyun (R & D Center, Kolon Eng. & Const. Co.) ;
- Kim, In-Ho (C & E Division, Kolon Eng, & Const. Co.) ;
- Yoo, Joung-Hoon (R & D Center, Kolon Eng. & Const. Co.) ;
- Kim, Seong-Min (C & E Site Kolon Eng. & Const. Co.)
- 발행 : 2005.10.07
초록
Overbreak or underbreak is one of the most important factors in evaluation the results of a tunnel blasting. Overbreak, which depends on the quality of rock, the type and quantity of explosives, and the method and condition of drilling, has been a target of challenge to many blasting engineers as it is connected with economic directly. Drilling is generally known as a primary one of overbreak producing factors. So, This study presented the practical solution to reduce overbreak, which was caused by drilling, through the analyses of how to make a drilling process accurate and how to evaluate the effect of each drilling method. Thus, this solution would give a quantitative analysis of overbreak and provide the information of how to reduce the quantity of overbreak. Moreover, for verifying this solution, we applied it to a tunnel project and then have found out that the quantity of overbreak decreased to approximately 10-40% compared with the previous way of overbreak control.