A Case Study on the Performance Analysis of Upper Slope Reinforcement Members during Blasting Excavation at a Tunnel Portal

Jongki Lee

doi:10.14481/jkges.2026.27.3.35

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2026 Vol.27, Issue 3 Preview Page

A Case Study on the Performance Analysis of Upper Slope Reinforcement Members during Blasting Excavation at a Tunnel Portal 터널갱구부 발파굴착 시 상부 비탈면 보강 부재 성능 분석 사례 연구

1 March 2026. pp. 35-41

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Abstract

Slope reinforcement structures constructed in rock masses may experience degradation in structural performance when subjected to external dynamic loads such as earthquakes or blasting after installation, which can adversely affect their stability and service life. In particular, reinforcement systems applied at tunnel portal slopes, including panel-type retaining walls and ground anchors, form integrated rock–structure systems through steel tendons and cement grout, making them susceptible to blasting-induced vibrations. Nevertheless, current blasting design practices primarily focus on preventing damage to nearby surface facilities and do not sufficiently consider potential damage to slope reinforcement structures located within the blasting influence zone.In this study, the damage characteristics of rock-integrated reinforcement systems—including panel-type retaining walls, anchor-supported composite structures, and soil nails—installed at tunnel portal slopes were evaluated under nearby blasting conditions. In addition, the effects of post-construction condition changes, such as tunnel excavation, on long-term performance were analyzed to provide fundamental data for improving future design and management criteria.

Keywords

Slope reinforcement structures

Blasting-induced vibrations

Blasting influence zone

비탈면 보강시설물은 암반층에 시공되지만, 시공 이후 지진이나 발파와 같은 외부 충격이 작용할 경우 구조적 성능이 저하되어 시설물의 안정성과 사용수명에 영향을 받을 수 있다. 특히 터널 갱구부 비탈면에 적용되는 패널식 옹벽, 어스앵커 등의 보강공법은 강연선과 시멘트 그라우트를 통해 암반과 일체화된 구조로 형성되어 발파진동에 의한 손상 가능성을 내재하고 있다. 그럼에도 불구하고 현행 발파설계는 인접 일반 시설물의 손상 방지에 중점을 두고 있어, 발파 영향범위 내 비탈면 보강시설물의 손상은 충분히 고려되지 못하고 있다.이에 본 연구에서는 터널 갱구부 비탈면에 적용되는 패널식 옹벽, 앵커 결합구조물, 소일네일 등 암반 일체화형 보강시설물을 대상으로 근접 발파에 따른 손상 특성을 평가하고, 터널 굴착 등 시공 이후 조건 변화가 장기 성능에 미치는 영향을 분석하여 향후 설계 및 관리 기준 마련을 위한 기초자료를 제시하고자 하였다.

키워드

비탈면 보강구조물

발파유발진동

발파영향 범위

References

Ahn, M.-S., Ryu, C.-H., Park, J-N. and Kwun, J.-A. (2001), “A Study on the Safe Blast Design to Increase Slope Stability”, J. Korean Soc. Explos. Blasting Eng., Vol. 19(1), 85~92.

Choi, K.-J. (2018), A study on the vibration resistance characteristics of anchors under earthquakes and blasting (Doctoral dissertation), Seoul National University of Science and Technology.

Korea Expressway Corporation. (2014), Assessment of road impacts due to tunnel construction beneath highways (Final Report).

Korea Expressway Corporation. (2015), Allowable criteria for blast-induced vibration of road structures (Tech. Rev. No. 2722).

Whang, H.-J., Lee, S.P. and Yang, H.-S. (2008), “Influence of Near Field Blasting Vibration to Earth Retaining Wall”, J. Korean Soc. Rock Mech. Vol. 18(2), 118~124.

Information

Publisher :Korean Geo-Environmental Society
Publisher(Ko) :한국지반환경공학회
Journal Title :Journal of the Korean Geo-Environmental Society
Journal Title(Ko) :한국지반환경공학회 논문집
Volume : 27
No :3
Pages :35-41
Received Date : 2026-02-10
Revised Date : 2026-02-15
Accepted Date : 2026-02-26
DOI :https://doi.org/10.14481/jkges.2026.27.3.35

Journal of the Korean Geo-Environmental Society ISSN:1598-0820(Print) 2714-1233(Online) 한국지반환경공학회 논문집

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