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2023 Vol.25, Issue 2 Preview Page

Technical Paper

Evaluation of low-vibration electronic detonator blasting method to improve constructability in non-vibration excavation section

무진동 굴착구간에서의 시공성 향상을 위한 미진동 전자발파공법 평가

Seung-won Jung1
,
Jin-Hyuk Song2
,
Nam-Sun Hwang3*
,
Hyun-Gi Kim4
,
Nam-Soo Kim5
,
Jong-woo Lee6
정 승원1
,
송 진혁2
,
황 남순3*
,
김 현기4
,
김 남수5
,
이 종우6
1Assistant Manager, Technical Service Part, IS Business Team, Hanwha Coporation/Global
2Manager, Technical Service Part, IS Business Team, Hanwha Coporation/Global
3General Manager, Technical Service Part, IS Business Team, Hanwha Coporation/Global
4Manager, Rapid Transit Business Division, Seoul Metropolitan Infrastructure Headquarters
5CEO, NSB NOW E&C
6Senior Managing Director, NSB NOW E&C
1비회원, (주)한화/글로벌 IS영업팀 기술지원파트 대리
2비회원, (주)한화/글로벌 IS영업팀 기술지원파트 과장
3정회원, (주)한화/글로벌 IS영업팀 기술지원파트 부장
4정회원, 서울특별시 도시기반시설본부 도시철도사업부 동북선 2과장
5정회원, (주)엔에스비 나우이엔씨 대표
6정회원, (주)엔에스비 나우이엔씨 전무
*Corresponding Author
31 March 2023. pp. 157-173
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Abstract

Although this site is designed with a non-vibration excavation method for a section of 265 m, there are concerns about decline of constructability and economic feasibility. For this reason, the low-vibration electronic detonator blasting method was suggested. To evaluate the applicability of the low-vibration electronic detonator blasting method, the damage range of blasting vibration of low-vibration electronic detonator blasting applied just before the site (suggestion Ⅰ) and low-vibration electronic detonator blasting constructed close range the subway like this site (suggestion Ⅱ) was analyzed. As a result of comparing the blasting vibration damage ranges of the two suggestions, the damage range of suggestion Ⅱ was calculated more conservatively. Considering the specificity of the close range of this site, suggestion Ⅱ was selected for design change for safer construction. As a result, it is predicted that there will be no damage to the structure even if the 72 m section out of the non-vibration excavation 265 m section is changed to the Low-vibration electronic detonator blasting. And it is evaluated that high economic benefits can be obtained because the total expected excavation period can be reduced by 144 days from 662.5 days.

Keywords
Non-vibration excavation method
Low-vibration electronic detonator blasting method
Close range
Damage range

본 현장은 265 m 구간이 무진동 굴착공법으로 설계되어 있지만 시공성과 경제성의 저하가 우려된다. 이러한 이유로 미진동 전자발파공법이 제안되었다. 미진동 전자발파의 적용성 평가를 위해서 본 현장 직전 적용하였던 미진동 전자발파(제안 Ⅰ)와 본 현장과 같이 지하철 근거리에서 시공된 미진동 전자발파(제안 Ⅱ)의 발파진동 영향범위를 분석하였다. 두 제안의 발파진동 영향범위 비교결과, 제안 Ⅱ의 영향범위가 더 보수적으로 산출되었다. 본 현장의 근거리라는 특수성을 고려할 때, 보다 안전한 시공을 위해 설계변경에 제안 Ⅱ를 선정하였다. 결과적으로 무진동 굴착구간 265 m 구간 중 72 m 구간에 대하여 미진동 전자발파공법으로 변경하여도 구조물에 미치는 영향이 없을 것으로 예측된다. 그리고 총 예상 굴진 소요 기간 662.5일에서 144일 단축할 수 있기 때문에 높은 경제적 이익을 얻을 수 있다고 평가된다.

키워드
무진동 굴착공법
미진동 전자발파공법
근거리
영향범위
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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 : 25
  • No :2
  • Pages :157-173
  • Received Date : 2023-03-09
  • Revised Date : 2023-03-20
  • Accepted Date : 2023-03-25
  • DOI :https://doi.org/10.9711/KTAJ.2023.25.2.157
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