Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Risk analysis for sidetrack construction during subway tunnel operation

기존 지하철 터널 운영 중 대피선 건설 시공 리스크 분석

  • Jun, Jonghun (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Chung, Heeyoung (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Koh, Sung-Yil (Seoha Engineering Co., Ltd.) ;
  • Yoon, Hee Taek (Advanced Railroad Civil Engineering Division, Korea Railroad Research Institute) ;
  • Yi, Na Hyun (Advanced Railroad Civil Engineering Division, Korea Railroad Research Institute) ;
  • Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 전종훈 (고려대학교 건축사회환경공학부) ;
  • 정희영 (고려대학교 건축사회환경공학부) ;
  • 고성일 ((주)서하기술단) ;
  • 윤희택 (한국철도기술연구원 첨단궤도토목본부) ;
  • 이나현 (한국철도기술연구원 첨단궤도토목본부) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Received : 2020.06.08
  • Accepted : 2020.06.27
  • Published : 2020.07.31
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Abstract

As an increasing demand for rapid railway transportation, the construction of sidetrack is inevitable to operate local and express trains simultaneously. However, the current technologies for the sidetrack construction method require a long construction period by interrupting the operation of the existing subway line, as well as cause a huge economic loss. Thus, it is necessary to study the sidetrack construction method under the special situation that the subway is in operation and to analyze the risk of the existing tunnel enlargement process for the sidetrack construction. Therefore, in this paper, the Government Complex Gwacheon station on Subway Line 4 was considered as a target station for the virtual sidetrack construction and the optimal sidetrack construction plan was derived. Subsequently, the application of risk management process was carried out in the order of identifying risk, risk response planning, performing a risk analysis, risk monitoring and control for potential risk events during the construction of sidetrack under the subway operation. A total of eight potential risk events and risk mitigation methods were selected, and a risk assessment matrix was established using the five-step risk probability and impact level criteria to perform the risk assessment including residual risks. Based on the results of the risk assessment, the risk grade and the reduction effect of each risk mitigation method were confirmed.

증가하는 도심지 전철 급행화의 요구에 따라, 완행과 급행철도를 동시에 운영할 수 있도록 하는 부본선의 건설이 필요하다. 그러나 기존 대피선 설치 방안은 열차의 운행을 차단한다는 점에서 긴 공사기간이 필요할 뿐만 아니라 막대한 경제적 손실을 발생시키는 문제점이 있다. 이를 개선하고자 기존 지하철 터널 운영 중이라는 특수한 상황에서의 대피선 설치 방안 연구가 필요하며 대피선 건설방안 적용에 따른 시공 리스크 분석 또한 요구된다. 따라서 본 논문에서는 지하철 4호선 과천정부청사역을 가상의 대피선 건설 대상역으로 선정하여 최적의 대피선 건설방안을 도출하였으며, 기존 지하철 터널운영 중 대피선 건설 예비 설계단계 시 발생 가능한 리스크 사건에 대한 리스크 식별 및 대응계획 수립, 리스크 평가, 리스크 통제 및 관리의 일련의 리스크 관리 프로세스를 수행하였다. 총 8가지의 발생 가능한 리스크 사건과 리스크 저감 대책을 선정하였으며 5단계의 리스크 사건 발생확률 및 영향도 기준을 활용한 리스크 평가 매트릭스를 구축하여 리스크 및 잔류 리스크 평가를 수행하였다. 리스크 평가 결과를 바탕으로 각 리스크 사건의 평가 점수와 리스크 저감 대책공법의 저감효과를 확인하였다.

Keywords

References

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