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논문 기본 정보

자료유형
학술저널
저자정보
Yang-Hoo Park (Seoul National University of Science and Technology) Kook-Hwan Cho (Seoul National University of Science and Technology)
저널정보
한국철도학회 International Journal of Railway International Journal of Railway Vol.9 No.1
발행연도
2016.9
수록면
21 - 26 (6page)

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When excavation under existing structure is planned for a new construction project, the underpinning method is one of the most applicable construction methods. This study introduces a new modified underpinning method which is applied to construct a new subway line in Seoul Metropolitan. The new subway line was designed to pass underneath the existing subway line. Existing subway line carries about 2 million passengers daily, which is 33% of total passengers using subway in Seoul, and is the only circulation line in Seoul. Subway trains are passing 540 times through this section in a day. By applying a new underpinning method, the subway box structure of line is exposed 54m in the air supported by bearing piles. The proposed method was carefully monitored using heavy instrumentation system during construction. This study proposed and verified the application of the modified underpinning method, which can reduce construction period by 1.5 times and the construction cost by 1.2 times comparing with conventional method. The importance of considering construction sequence is investigated and verified by analyzed data non-considering construction sequence. The unexpected heaving which can bring up a dangerous situation for train running stability were measured, so this study shows that the upward movement has to be analyzed in designing process. As the use of underground space increases, the proposed method can be a good example of underground development.

목차

Abstract
1. Introduction
2. Underpinning Method
3. Construction
4. Design using Numerical Analysis
5. Conclusion
References

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