The First Case Study of TBM Pre-Excavation Type 2-Arch Tunnel in Korea

Hyung-Ryul Kim; Sang-Jun Jung; Jun-Ho Kang

doi:10.7474/TUS.2023.33.4.255

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2023 Vol.33, Issue 4 Preview Page Next Page

Case Study

The First Case Study of TBM Pre-Excavation Type 2-Arch Tunnel in Korea 국내 최초 TBM선굴진 2-Arch터널 설계사례 연구

31 August 2023. pp. 255-264

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Abstract

As the demand for urban underground space increases recently, urban tunnel planning is actively progressing. In the urban area, a underground station is planned in consideration of the living environment of residents, and 2-arch tunnel is applied for the stability of existing structures and reduction of environmental damage. However, since the depth of weak rock mass is deeply distributed in the urban area due to severe weathering, careful planning is required to secure tunnel stability. In addition, if TBM mechanical excavation is applied as the main tunnel excavation method considering the composite ground in urban area, the construction connectivity with the 2-arch tunnel of the NATM concept may be deteriorated. In this study, the design case of applying TBM pre-excavation type 2-arch tunnel for the first time in Korea was mainly described. The main considerations for the segment design of TBM pre-excavation type 2-arch tunnel were explained for side tunnels. Also, a stability analysis was conducted to verify the effectiveness and adequacy of the TBM pre-excavation type 2-arch tunnel.

Keywords

TBM pre-excavation type 2-Arch tunnel

Shield TBM

Segment lining

Station tunnel

근래 들어 도심지 지하공간 개발에 대한 수요가 증가함에 따라 도심지 터널계획이 활발히 진행되고 있다. 도심지 구간에는 주민 생활환경을 고려하여 지하정거장이 계획되며, 기존 구조물의 안정성 및 환경훼손 저감 등을 위해 2-Arch터널 정거장을 적용하고 있다. 그러나 도심지 구간은 심한 풍화작용에 따라 불량지반의 심도가 깊게 발달되어 터널 안정성 확보를 고려한 신중한 계획이 요구된다. 이뿐만 아니라 도심지의 복합적인 지반상태를 고려하여 본선터널에 TBM 기계굴착 공법을 적용하는 경우, 기존 NATM형 2-Arch터널과는 시공연계성을 확보할 수 없게 된다. 본 연구에서는 쉴드TBM과 2-Arch터널을 조합한 형태인 TBM선굴진 2-Arch터널을 국내 최초로 적용한 설계사례를 중점으로 기술하고자 하였다. 중앙터널 굴착후 좌우터널 시공을 고려하여 쉴드TBM 세그먼트 설치 및 해체를 위해 고려한 설계사항을 설명하고, 수치해석을 활용한 안정성 검토를 통해 TBM선굴진 2-Arch터널의 설치효과를 검증하였다.

키워드

TBM선굴진 2-Arch터널

쉴드TBM

세그먼트

터널 정거장

References

Cao, L., Fang, Q., Zhang, D., and Chen, T., 2018, Subway station construction using combined shield and shallow tunnelling method : Case study of Gaojiayuan station in Beijing, Tunn. Undergr. Space Technol., 82, 627-635. 10.1016/j.tust.2018.09.010

Korea National Railway(KR), 2020, Track Maintenance Guidelines.

Liu, J., Wang, F., He, S., Wang, E., and Zhou, H., 2015, Enlarging a large-diameter shield tunnel using the pile-beam-arch method to create a metro station, Tunn. Undergr. Space Technol., 49, 130-143. 10.1016/j.tust.2015.04.006

Xu, X., Li, Z., Fang, Q., and Zheng, H., et al., 2020, Challenges and countermeasures for using pile-beam-arch approach to enlarge large-diameter shield tunnel to subway station, Tunn. Undergr. Space Technol., 98. 10.1016/j.tust.2020.103326

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 : 33
No :4
Pages :255-264
Received Date : 2023-08-08
Revised Date : 2023-08-21
Accepted Date : 2023-08-22
DOI :https://doi.org/10.7474/TUS.2023.33.4.255

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

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