A comparative study on the stability evaluation of double deck tunnel in terms of excavation

'주요 도심지 도로건설은 포화상태로 지하공간의 개발이 필요하며 이를 위해 지하철도와 지하 도로 터널의 건설은 활발히 진행되어 왔다. 국외의 경우 지하 도로터널을 2층구조로 활용하는 복층터널 시공이 이루어 졌으며 이에 따른 지하공간 개발 기술이 높은 수준에 이르고 있다. 2차로 병설터널을 2차로 복층터널로 계획하는 경우 굴착 면적은 크게 차이가 나지 않으며, 터널 통과구간이 차지하는 폭을 대폭 줄일 수 있다. 이를 통해 터널 통과구간이 차지하는 폭을 대폭감소시킬 수 있으므로 지반조건이 불량한 경우 필요한 상부 보강 비용을 절감할 수 있다. 본 연구에서는 복층터널 굴착에따른 영향에 대해 알아봄으로써 지하공간 활용 기술을 높이고 단층터널 굴착영향과 비교를 통해 향후 복층터널 설계 및안정성 평가에 도움이 될 수 있을 것으로 기대된다.

keywords: Double deck tunnel, Large tunnel, Strength stress ratio, Strength reduction method, 복층터널, 대단면터널, 강도응력비, 강도감소법

Abstract

It is necessary to construct underground in the metropolis. Road traffic has reached saturation point. The city has several underground road construction projects. In abroad, double deck tunnels are planned and constructed. It is attained a high level of underground development technology. In case the double deck tunnel (2 lane) is planed instead of the bidirectional tunnel (2 lane), excavation area is similar. But tunnel width is decreased. The reduced width can cut cost for the tunnel reinforcement. This study evaluates the stability of excavation on double deck tunnel. By the assessment of the strength-stress ratio and strength reduction method, quantitative analysis is conducted between double deck tunnel and the bidirectional tunnel

keywords: Double deck tunnel, Large tunnel, Strength stress ratio, Strength reduction method, 복층터널, 대단면터널, 강도응력비, 강도감소법

참고문헌

1. Duncan, J.M. (1996), “State of the art: limit equilibrium and finite-element analysis of slopes”, Journal of Geotechnical Engineering, Vol. 122, No. 7, pp. 577-596.

2. Nam, K.M., Choi, M.K., Kim, J.J., Yoo, H.K. (2017), “Stability analysis of an existing utility tunnel due to the excavation of a divergence tunnel emerging from double-deck tunnel”, Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 2, pp. 231-248.

3. Park, J.W., Park, Y.J., You, K.H., Lee, S.D. (2004), “A study on the assessment of safety factor tunnels”, Journal of Korea Society for Rock Mechanics, Vol. 14, No. 5, pp. 327-338.

4. Park, Y.J., Chae, Y.S., You, K.H., Paik, Y.S. (1999), “Slope stability analysis by slice method and finite difference method -A comparative study-”, Journal of Korean Geotechnical Society, Vol. 15, No. 6, pp. 263-272.

5. Park, Y.J., You, K.H. (1998), “Stability analysis for jointed rock slope using ubiquitous joint model”, Journal of the Korean Society for Rock Mechanics, Vol. 8, No. 4, pp. 287-295.

6. You, K.H., Park, Y.J., Bae, G.J. (2000), “An assessment of safety factor for tunnels excavated in a weak rock layer”, Journal of Korean Tunnelling and Underground Space Association, Vol. 2, No. 3, pp. 47-57.

바로가기메뉴

논문 상세

Vol.21 No.1

대심도 복층터널에 대한 굴착 안정성 평가비교 연구

A comparative study on the stability evaluation of double deck tunnel in terms of excavation

초록

Abstract

참고문헌

(사)한국터널지하공간학회