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Case study on Construction and Improvement of Rahmen Structures in Deep Soft Clay Deposit

대심도 연약지반에 설치된 라멘 구조물의 시공 및 보강사례

  • Received : 2014.02.07
  • Accepted : 2014.03.25
  • Published : 2014.03.30

Abstract

Structures that have constructed in soft clay might suffer from many issues related to consolidation settlement or lateral movement of soft-clay during long-term period. Therefore, it is important to establish proper design and construction processes related to site investigation, soil improvement, construction management, and so on. This case study focused on the construction of the rahmen structure supported by pile foundations. Especially, the structure in this case had been constructed without improving underlying soft clay and before constructing backfill embankment due to the limited construction time and the traffic connection of the old road crossing new highway. Therefore, in order to satisfy the structural stability, the construction processes and countermeasure methods were carefully planned based on the results of preliminary numerical analyses and monitoring of ground behaviors. Through the trial and error precess during the construction, the structures had been successfully constructed.

연약지반에 설치되는 구조물은 장기간에 걸쳐 발생하는 연약지반의 압밀 침하 또는 측방유동 현상에 의하여 많은 문제점들이 발생할 수 있다. 그러므로, 지반조사, 지반개량, 시공관리 등과 관련하여 적합한 설계 및 시공순서를 결정하는 것이 중요하다. 본 연구의 시공사례는 기초구조물로 지지되는 라멘구조물을 대상으로 하였다. 특히, 본 사례는 공사기간의 제약과 새로운 고속도로를 가로지르는 기존 도로의 연결 문제 등으로 구조물 하부 연약지반을 개량하지 않고 배면 성토를 시공하기 전에 구조물을 먼저 시공하였다. 이에 따라, 구조물의 안정성을 확보하기 위하여 수치해석 및 지반계측 결과를 바탕으로 시공절차 및 대책공법을 주의깊게 계획하였다. 시공과정 중에 여러 번의 시행착오를 거쳐 성공적으로 구조물 시공을 완료할 수 있었다.

Keywords

References

  1. Dream E&G (2011), Detailed Design of Namhae Expressway Expansion (between Naengjeong and Busan) - Stability against Lateral Spreading of Soft Clay.
  2. Dream E&G (2012), Stability against Bridge Lateral Spreading in Soft Clay.
  3. MidasIT (2013), Analysis Reference of Soilworks program (Ver.350).
  4. Korea Expressway Corporation (2008), Site Investigation Report of 104 Namhae Expressway Expansion (between Naengjeong and Busan).
  5. Korea Expressway Corporation (2011), Soft Clay Technical Advisory Reports on Expressway Expansion between Naengjeong and Busan (1st year).
  6. Korea Expressway Corporation (2013), Soft Clay Technical Advisory Reports on Expressway Expansion between Naengjeong and Busan (3rd year).