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2026 Vol.28, Issue 4

Research Paper

Analysis of blasting-induced vibration reduction via standoff and pre-split blasting in vertical shaft slurry wall excavation

지하연속벽 수직구 굴착 시 이격 및 선굴착 발파의 진동 저감 특성 분석

Seong-Gyu Choi1
,
Ki-Il Song2*
,
Pok-Hwan Bae3
최 성규1
,
송 기일2*
,
배 복환3
1Master Student, Dept. of Smart City Engineering, Inha University
2Professor, Dept. of Civil Engineering, Inha University
3Graduate Student, Dept. of Civil Engineering, Inha University
1학생회원, 인하대학교 스마트시티공학과 석사과정
2정회원, 인하대학교 사회인프라공학과 교수
3정회원, 인하대학교 토목공학과 박사과정
*Corresponding Author
31 July 2026. pp. 267-285
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Abstract

Blasting is often unavoidable at the bottom of deep vertical shafts supported by slurry walls, where the short separation distance between the blast face and the wall can transmit strong vibration to the wall. This study evaluates vibration transmitted to slurry walls during vertical-shaft excavation using 3D numerical analysis, focusing on the influence of sectional blasting configurations and rock mass conditions. A 3D shaft–wall model was developed using field-informed design conditions, and material properties were varied to represent weathered rock, soft rock, and hard rock. Four scenarios—Conventional Blasting, Standoff Blasting, Pre-split Blasting, and Standoff + Pre-split Blasting—were analyzed under identical modeling assumptions to enable consistent relative comparisons across rock types. Wall response was quantified using peak particle velocity (PPV) and its variation with excavation depth. The results indicate that PPV levels and depth-dependent response patterns are sensitive to both blasting configuration and rock condition. Compared with Conventional Blasting, introducing separation and/or a pre-split free surface tends to reduce vibration transmitted to the wall, with the reduction magnitude depending on the rock condition. These findings support comparative selection of vibration-mitigating blasting configurations and help interpret wall vibration trends during deep-shaft construction.

Keywords
Blasting vibration
Slurry wall
Vertical shaft
Numerical analysis
Peak particle velocity

본 연구는 대심도 수직구 굴착에서 저부 암반 발파로 발생한 진동이 지하연속벽(slurry wall)으로 전달되는 거동을 3차원 수치해석으로 평가하고 발파 단면 구성과 암반 조건에 따른 진동 저감 효과를 비교하였다. 수직구에서는 발파면과 지하연속벽 하단부의 이격거리가 짧아 진동 전달이 커질 수 있으며 이는 균열, 이음부 결함, 누수 등 시공 품질 문제를 악화시킬 가능성이 있다. 본 연구는 이러한 현상의 직접적인 인과관계를 규명하기보다, 동일 조건에서 발파 단면 변경이 벽체 진동 응답에 미치는 상대적 변화를 정량화하는 데 목적이 있다. 현장 설계 및 시공 정보를 바탕으로 3차원 수직구 지하연속벽 모델을 구축하였다. 암반부 물성치를 달리 적용하여 풍화암, 연암, 경암 조건을 대표하도록 하였다. 일반 발파, 이격 발파, 선굴착 후 발파, 이격발파와 선굴착 발파 병용의 네 시나리오를 동일한 해석 가정 하에서 비교하였다. 지하연속벽의 응답은 최대입자속도 PPV와 굴착 심도에 따른 분포로 평가하였다. 해석 결과 PPV 수준과 심도별 응답 형상은 발파 단면과 암반 조건에 민감하게 변화하였다. 일반 발파 대비 이격 및 선굴착 적용 시 지하연속벽으로 전달되는 진동이 저감되는 경향을 보였으며 저감 정도는 암반 조건에 따라 달랐다. 본 연구 결과는 대심도 수직구 시공에서 진동 저감형 발파 단면 선정을 위한 상대적 경향을 보여준다.

키워드
발파진동
수직구
지하연속벽
수치해석
최대입자속도
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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 : 28
  • No :4
  • Pages :267-285
  • Received Date : 2026-05-12
  • Revised Date : 2026-06-08
  • Accepted Date : 2026-06-08
  • DOI :https://doi.org/10.9711/KTAJ.2026.28.4.267
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