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ISSN : 2233-8292

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Vol.19 No.5
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복층터널의 분기터널 굴착에 따른 기존터널의 안정성 분석

Stability analysis of a existing tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2017, v.19 no.5, pp.779-797
https://doi.org/10.9711/KTAJ.2017.19.5.779
김한얼 (한양대학교)
김정주 (한양대학교(ERICA캠퍼스) 공학기술연구소)
이재국 (한양대학교)
유한규 (한양대학교)
김한얼, 김정주, 이재국, & 유한규. (2017). 복층터널의 분기터널 굴착에 따른 기존터널의 안정성 분석. (사)한국터널지하공간학회, 19(5), 779-797, https://doi.org/10.9711/KTAJ.2017.19.5.779
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초록

최근 도심지의 지상교통시설이 포화수준에 이르렀을 뿐만 아니라 증가하는 교통량으로 인한 교통난과 미세먼지 등의 대기환경 오염의 심화로 인하여 지하도로건설이 각광을 받고 있다. 지하도로건설은 도심지 교통난 해소와 더불어 친환경적인 도시설계가 가능하기 때문에 신설도로 뿐만 아니라 기존도로 역시 지하화 되어 가는 추세이다. 지하도로건설시 IC(분기점)와 JC(나들목) 역할을 수행하는 분기터널의 건설은 필수적이라 할 수 있다. 따라서 분기터널에 의한 기존터널의영향분석은 필수적으로 고려해야한다. 본 연구에서는 분기터널 굴착 시 기존터널에 미치는 영향을 수치해석을 통해 분석하였다. 분기터널을 기존터널의 직하부를 기점으로 하여 시계방향으로 45°간격으로 총 5가지의 경우를 설정하였으며, 각각의 경우에서 변위조절방법(Displacement Controlled Model)을 이용하여 지반손실률을 0.5%, 1.0% 그리고1.5%을 적용하여 수치해석을 실시하였다. 그 결과, 지반손실률이 증가할수록 변위와 파괴범위, 그리고 안정성에 미치는영향이 증가하는 것으로 나타났다. 또한 직하부에 위치한 분기터널이 가장 안정성에 취약한 것으로 확인 되었으며, 분기터널의 위치가 연직, 수평방향에 있을 경우보다 대각선방향에 위치할 경우가 변형과 라이닝 파괴 측면에서 불안정한 것으로 나타났다.

keywords
분기터널, 지반손실률, 변위, 터널라이닝, 안정성 평가, Divergence tunnel, Volume loss, Displacement, Tunnel lining, Stability analysis

Abstract

Recently, underground road construction is attracting attention due to the groundtransportation facilities in the urban area have reached the saturation level and also theincrease in the traffic volume and the deepening of air pollution such as fine dust. Construction of underground roads is not only a reduce trafficjam in downtown butalso eco-friendly city design, so existing roads as well as new roads are becomingunderground. It is essential to construct divergence tunnels that serve as IC (interchage)and JC (Junction) when constructing underpasses. Therefore, the analysis of the effectof the existing tunnel by the divergence tunnel should be considered as essential. Inthis study, numerical analysis is performed to analyze the effect of existing tunnel onexcavation of divergence tunnel. The divergence tunnels were set in 5 cases at 45°intervals in the clockwise direction starting from the lower part of the existing tunnel. In each case, numerical analysis was carried out by using the DCM (DisplacementControlled Model) for applying the volume loss of 0.5%, 1.0% and 1.5%. As a result,it was found that, when the volume loss increased, the effect on displacement, fracturerange, and effect on stability increased as well. In addition, it was confirmed that thedivergence tunnel located directly underneath is weakest for the stability, and the casewhere the divergence tunnel is located diagonally rather than the vertical andhorizontal direction is found to be vulnerable to displacement and lining destruction.

keywords
분기터널, 지반손실률, 변위, 터널라이닝, 안정성 평가, Divergence tunnel, Volume loss, Displacement, Tunnel lining, Stability analysis

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