Development and Application of Large-diameter Cut-hole Exploration System for Assessment of the Geological Condition beyond NATM Tunnel Face

Minseong Kim; Jinhyeok Jung; Jekyum Lee; Minsun Park; Jeonghyeon Bak; Seungwon Lee

doi:10.7474/TUS.2021.31.1.001

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2021 Vol.31, Issue 1 Next Page

Technical Note

Development and Application of Large-diameter Cut-hole Exploration System for Assessment of the Geological Condition beyond NATM Tunnel Face NATM 터널의 굴착면 전방 지질 평가를 위한 대구경 심발공 탐사 시스템 개발 및 적용 사례

28 February 2021. pp. 1-9

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Abstract

Recently, the development of underground space has been accelerated with rapid urbanization, and it is significantly important for safe construction to accurately understand the geological conditions of the section when excavating rocks. In this paper, a boring alignment tracking and geological exploration system have been developed to identify the geological conditions beyond the excavation face by utilizing a MSP method that bores a large empty hole to reduce blast-induced vibration. The major advantage of the proposed exploration system is that we can obtain the ground condition of 50 m ahead of the excavation face through exploration along blast cut-holes drilled for the NATM tunnel construction. In addition, we introduce several case histories regarding the assessment of the geological conditions beyond the tunnel face by monitoring the inside of large empty holes using the proposed hole exploration system.

Keywords

NATM tunnel

MSP method

Large-diameter cut-hole

Ground investigation

Geological condition beyond excavation face

최근 도시화가 가속화됨에 따라 지하공간 개발을 위한 굴착공사가 지속적으로 이루어지고 있으며, 암반 굴착 시 해당 구간의 지질 상태를 정확히 파악하는 것은 안전한 시공을 위해 매우 중요하다. 본 논문에서는 터널 발파 진동을 저감시키기 위해 대구경 무장약공을 천공하는 MSP 공법을 활용하여 굴착면 전방의 지질 특성을 파악하기 위해 천공경로 및 지반탐사 복합시스템을 개발하였다. 제안된 탐사 시스템은 NATM 터널 공사를 위해 천공된 대구경 심발공을 활용해 굴착면 전방 50 m 구간의 지질 정보를 획득할 수 있다는 큰 장점이 있다. 또한, 제안된 탐사 시스템을 현장에 적용하고 대구경 무장약공 내부를 모니터링하여 터널 굴착면 전방의 지질 상태를 평가한 사례를 소개한다.

키워드

NATM 터널

MSP 공법

대구경 심발공

지반 탐사

터널 전방 지질 예측

References

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 31
No :1
Pages :1-9
Received Date : 2021-02-16
Revised Date : 2021-02-22
Accepted Date : 2021-02-23
DOI :https://doi.org/10.7474/TUS.2021.31.1.001

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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