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Research Article

Prediction of Preceding Crown Settlement Using Longitudinal Displacement Measured on Tunnel Face in Fault Zone

단층대가 분포하는 터널에서 굴진면 수평변위를 이용한 선행 천단변위 분석

Hyun-Seok Yun1
,
Kyung-Ryang Do2
,
Yong-Seok Seo1*
윤 현석1
,
도 경량2
,
서 용석1*
1Department of Earth and Environmental Sciences, Chungbuk National University
2Daelim Industrial Company, Limited
1충북대학교 지구환경과학과
2대림산업주식회사
* 교신저자* Corresponding Author
March 2017. pp. 81-90
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Abstract

Preceding displacements in tunnel are difficult to predict since the measurements of displacements after excavation can not beperformed immediately. In the present study, The longitudinal displacements which can be measured immediately after excavation are used to predict the crown settlements occurring before excavation only if fault is located at the tunnel crown. Three dimensional finite element analysis was conducted using 28 numerical models with various fault attitudes to analyze the correlation between the longitudinal displacements on tunnel face and preceding crown settlements. The results, Lface/C ratio show2~12% in the drives with dip models and 2~13% in the drives against dip models individually. In addition, each model has a certain Lface/C ratio. The result of the regression analysis show that the coefficient of determination is over 0.8 in most models. Therefore, crown settlements occurring before excavati on can be predicted by analyzing the longitudinal displacements occurringon tunnel faces.

Keywords
preceding displacements
longitudinal displacement on tunnel face
preceding crown settlement
fault, Lface/C ratio

터널에서의 일상계측은 공정 특성상 굴착 후 바로 수행되기 어렵고, 일정 간격마다 수행되기 때문에 굴착 전 발생하는 선행변위를 측정할 수 없다. 본 연구에서는 굴착과 동시에 측정할 수 있는 굴진면 수평변위를 이용하여 단층대가 터널 상부에 분포하는 경우 천단부에서 발생하는 선행변위를 분석하였다. 단층이 터널의 굴진방향과 이루는 각도와 경사가 서로 다른 24개 모델에 대해 3차원 유한요소해석을 실시하여 굴진면 수평변위와 선행 천단변위의 상관성을 분석하였다. 분석결과, 선행 천단변위에 대한 굴진면 수평변위의 비(Lface/C ratio)는 순경사 모델의 경우 약 2~12%, 역경사 모델은 2~13%로 각 모델별로 일정한 비율을 보이는 것으로 나타났다. 또한 회귀분석을 통한 선행 천단변위와 굴진면 수평변위의 상관성을 분석한 결과, 대부분의 모델에서 약 0.8 이상의 높은 결정계수(R2)를 보여 굴진면에서 발생하는 수평변위를 이용하면 계측 전 터널 천단에서 발생하는선행변위의 산정이 가능한 것으로 나타났다.

키워드
선행변위
굴진면 수평변위
선행 천단변위
단층
Lface/C 비
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 27
  • No :1
  • Pages :81-90
  • Received Date : 2017-03-15
  • Revised Date : 2017-03-21
  • Accepted Date : 2017-03-25
  • DOI :https://doi.org/10.9720/kseg.2017.1.81
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