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2014 Vol.16, Issue 4 Preview Page
Deformation behavior of tunnels crossing weak zone during excavation- numerical investigation

연약대를 통과하는 터널의 시공중 변위거동 - 수치해석 연구

Chungsik Yoo1*
,
Jung-Gyu Park2
유 충식1*
,
박 정규2
1Professor, Dept. of Civil Engineering, Sungkyunkwan Univ.
2Manager, R&D Center, POSCO E&C, Co., Ltd
1성균관대학교 건설환경시스템공학과 교수
2(주)포스코건설, 기술연구소 과장
*교신저자. *Corresponding Author. 
31 July 2014. pp. 373-386
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Abstract

This paper concerns the deformation behavior of tunnels crossing weak zone during excavation. A three dimensional finite element model was adopted in order to conduct a parametric study on the orientation of weaj zone in terms of strike and dip angle relative to the tunnel longitudinal axis. The results of the analyses were then analyzed so that the tunnel displacements in terms of the ratios between the crown settlement and springline displacement can be related to the orientation of the weak zone. The results indicate that the displacement ratios between the tunnel crown and springline tend to quantitatively change when a weak zone exists near or ahead of the tunnel suggesting that the displacement ratios can be effectively used to predict the weak zone during tunnelling. Practical implications of the findings are discussed.

Keywords
Drill and blast tunnel
Finite element analysis
Tunnel instrumentation
weak zone
Deflection curve
Trend line

본 연구에서는 연약대를 관통하는 터널의 변위거동에 관한 연구내용을 다루었다. 이를 위해 발파굴착 공법이 적용되는 터널을 대상으로 다양한 파쇄대 조건을 도출하고 이에 대한 3차원 해석을 수행하여 파쇄대의 주향 및 경사와 터널 변위 거동과의 관계에 대한 매개변수 연구를 실시하였다. 해석결과를 토대로 파쇄대의 공간적 분포 특성에 따른 터널의 파쇄대 관통 전후의 변위 거동을 고찰하였으며 이를 토대로 현재 실무에서 적용되고 있는 3차원 계측결과의 활용방안을 모색하였다. 3차원 해석 결과를 분석한 결과 터널 천단 및 내공변위의 각 성분비는 터널 주변 파쇄대의 터널과의 상대적 위치 및 방향성에 따라 달라지는 것으로 관찰되어 천단 및 내공변위 등 전통적인 터널 안정성 지표와 아울러 터널의 안정성 검토는 물론 주변 파쇄대 존재여부를 판정하는 지표로 활용할 수 있는 것으로 검토되었다.

키워드
발파 굴착 터널
유한요소해석
터널 계측
연약대
처짐곡선
경향선
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 16
  • No :4
  • Pages :373-386
  • Received Date : 2014-07-03
  • Revised Date : 2014-07-14
  • Accepted Date : 2014-07-18
  • DOI :https://doi.org/10.9711/KTAJ.2014.16.4.373
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