워터젯 자유면을 이용한 암반발파 굴착공법의 효과

Tae-Min Oh; Gye-Chun Cho; In-Taeg Ji

doi:10.9711/KTAJ.2013.15.1.049

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2013 Vol.15, Issue 1 Preview Page Next Page

워터젯 자유면을 이용한 암반발파 굴착공법의 효과

31 January 2013. pp. 49-57

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Abstract

기존 발파를 이용한 암반굴착 공법은 효율적이나 심각한 수준의 발파진동 및 여굴/미굴을 발생시킨다. 이러한 단점을 보완하기 위해, 본 연구에서는 워터젯 절삭기술을 이용하여 터널 계획선을 따라 자유면을 형성한 후 발파하는 공법을 제안하고 있다. 제안공법은 (1) 발파진동/소음을 저감시키고, (2) 여굴/미굴을 최소화 시키고, (3) 굴착효율 극대화가 가능하다. 제안공법의 효과를 검증하기 위해 기존에 널리 쓰이고 있는 스무스 블라스팅(smooth blasting) 공법을 실험 대조군으로 설정하여 동일한 조건에서 현장실험을 수행하였다. 실험결과, 발파 진동은 최대 55% 감소하고 여굴/미굴은 거의 발생하지 않는 것으로 확인되었다. 또한 굴착효율은 기존공법에 비해 뛰어난 것으로 분석되었다. 본 연구에서 제안하고 있는 워터젯 자유면을 이용한 암반 발파공법은 도심지 굴착공사뿐만 아니라 지하구조물 구축공사에 널리 활용될 수 있을 것으로 기대된다.

The conventional blasting method generates serious blasting vibration and underbreak/overbreak in spite of its high efficiency for rock excavation. To overcome these disadvantages, this paper introduces an alternative excavation method that combines the conventional blasting process with the free surface on the perimeter of the tunnel face using waterjet cutting technology. This proposed excavation method has advantages of (1) reducing vibration and noise level; (2) minimizing underbreak and overbreak; and (3) maximizing excavation efficiency. To verify the effects of the proposed excavation method, field tests were performed with a smooth blasting method at the same excavation conditions. Test results show that the vibration is reduced by up to 55% and little underbreak/overbreak is generated compared with the smooth blasting method. In addition, the excavation efficiency of the proposed method is greater than that of the smooth blasting method. The proposed blasting method with a free surface using waterjet cutting can be applied to urban excavation construction as well as to underground structure construction.

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 15
No :1
Pages :49-57
DOI :https://doi.org/10.9711/KTAJ.2013.15.1.049

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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