Prediction of Long-term Behavior of Tunnel in the Presence of Geological Anomalies

Hoki Ban; Heesu Kim; Jungkuk Kim; Donggyou Kim

doi:10.14481/jkges.2023.24.8.13

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2023 Vol.24, Issue 8 Preview Page

Prediction of Long-term Behavior of Tunnel in the Presence of Geological Anomalies 지질이상대가 존재하는 구간에서의 터널의 장기거동 예측

1 August 2023. pp. 13-20

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Abstract

Tunnelling through the geological anomalies has widely known to have many difficulties such as bottom heave, crack of lining, squeezing and so on. To stabilize the tunnel during the construction or after construction, various reinforcing methods have been introduced and applied such as micropiling at the bottom of tunnel to prevent the bottom heave. In this study, long-term behavior of tunnel in the presence of geological anomalies was predicted using numerical analyses. To this end, material properties for swelling rock model capable of representing the rock swelling behavior was obtained using matching process with measured data to validate the adopted model. After the model validation, simulations were performed to predict the long-term behavior of tunnel in the geological anomalies.

Keywords

Tunnel

Numerical analysis

Swelling rock

Geological anomalies

지반이상대 구간을 지나는 터널은 시공 중 또는 시공 후 지반융기, 균열, 전단 파괴 등의 이상변위 발생이 많이 보고되고 있다. 이러한 이상변위가 지속되거나 큰 경우에는 최종적으로 터널 붕괴위험의 우려가 있으며, 다양한 보강공법을 사용하여 터널 붕괴위험을 저감시키고 있다. 본 연구에서 살펴본 터널은 막장이 완전 풍화상태가 주를 이루며 부분적으로 심한 풍화상태로 분포하는 구간에 시공되었다. 시공 중 터널 내공변위를 침범하여 강지보 및 숏크리트를 재시공하였으며, 기존 설치된 flat형 인버트의 제거 없이 현 상태에서 라이닝 철근 보강공법을 적용하였다. 이러한 보강공법을 적용 후 실시한 계측 자료를 바탕으로 바닥의 융기 가능성 구간에 대하여 수치해석적인 방법으로 장기변위 예측을 통해 터널의 장기적인 안정성을 검토하였다.

키워드

터널

수치해석

Swelling rock

지반이상대

References

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Information

Publisher :Korean Geo-Environmental Society
Publisher(Ko) :한국지반환경공학회
Journal Title :Journal of the Korean Geo-Environmental Society
Journal Title(Ko) :한국지반환경공학회 논문집
Volume : 24
No :8
Pages :13-20
Received Date : 2023-07-12
Revised Date : 2023-07-17
Accepted Date : 2023-07-26
DOI :https://doi.org/10.14481/jkges.2023.24.8.13

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

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