Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Excavation Damage Zone (EDZ) under TBM Advancement Based on Large Deformation Technique (Coupled Eulerian-Lagrangian)

대변형 해석기법(Coupled Eulerian-Lagrangian Technique)을 이용한 TBM 굴착손상영역 분석

  • 이승연 (한국철도기술연구원) ;
  • 김도현 (연세대학교 토목환경공학과) ;
  • 정상섬 (연세대학교 토목환경공학과)
  • Received : 2016.03.24
  • Accepted : 2016.11.25
  • Published : 2016.12.31
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Abstract

In this study, Coupled Eulerian-Lagrangian (CEL) analysis, which is one of the large deformation analyses, was incorporated to investigate excavation damage zone (EDZ) under TBM advancement. Considering the quasi-static condition, the dynamic analysis was performed to simulate the real TBM advancement and subsequently a case study on mesh and TBM excavation rate was carried out for satisfying a balance of accuracy and economic computational time. Based on this, a series of parametric studies were performed for different rock types and tunnel diameters. From the numerical analysis results, it is found that EDZ was taken to range within 0.4D(D=tunnel diameter) for most rocks. It is also found that the EDZ tends to increase as the tunnel diameter increases.

본 연구에서는 대변형 해석기법 중 하나인 Coupled Eulerian-Lagrangian 해석기법을 적용하여 TBM 굴진으로 발생하는 굴착손상영역을 분석하였다. 실제 TBM 굴진과정을 모사하기 위해 quasi-static 조건을 고려하여 동적해석을 수행하였으며, 해석시간의 효율성과 정확도를 만족시키는 최적의 조건을 찾기 위해 mesh 및 TBM 굴진속도를 변수로 하여 case study를 수행하였다. 또한 암반 종류 및 터널 직경이 굴착손상영역에 미치는 영향을 확인하기 위해서 매개변수연구를 수행하였다. 수치해석 결과, TBM 굴착으로 인한 굴착손상영역은 대부분의 경우 0.4D 이내로 나타났으며, 터널직경이 커짐에 따라 굴착손상영역도 증가하는 것으로 나타났다.

Keywords

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