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Model for predicting ground surface settlement by field measuring and numerical analysis in shield TBM tunnel

현장계측과 수치해석에 의한 쉴드TBM 터널의 지표침하 예측모델

Seung-Chul Kim1
,
Sung-Youll* Ahn2*
,
Song Lee3
,
Tae-Kil Noh4
김 승철1
,
안 성율*2*
,
이 송3
,
노 태길4
1Department of Civil Engineering, University of Seoul, Doctor Student
2SYTECENC Co. Ltd, president & CEO
3Department of Civil Engineering, University of Seoul, Professor
4Department of Civil Engineering, University of Seoul, Post-doctoral Researcher
1서울시립대학교, 박사과정
2(주)사이텍이엔씨, 대표이사
3서울시립대학교, 교수
4서울시립대학교, 박사후 연구원
*교신저자. *Corresponding Author. 
31 May 2013. pp. 271-287
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Abstract

In this study, more convenient model(S-model) for predicting ground surface settlement is developed through comparing field monitoring data of the domestic subway applied shield TBM method with conventional equation & numerical analysis. Sample stations are chosen from whole of excavation section and lateral & vertical ground surface settlement characteristic with excavation are analysed. Based on analysis result, through the comparison with actual monitoring data, the model that is possible to compute maximum surface settlement and settlement influence area is suggested with assumption that lateral surface settlement forms are composed relaxed zone and elastic zone. In addition, vertical ground surface settlement patterns with excavation are similar to cubic-function and S-model with assumption that coefficients are function of tunnel diameter and depth is suggested. Consequently, the ground surface settlement patterns are significantly similar to actual monitoring data and numerical method result. Thus, as a result, when tunnels are excavated using sheild TBM through rather soft weathered soil & rock layer, prediction of ground surface settlement with excavation using convenient S-model is practicable.

Keywords
Shield TBM
Surface settlement
Gap parameter
FEM analysis
Segment
S-model

본 연구는 쉴드 TBM을 적용한 국내 지하철 현장의 계측 자료를 분석하고 기존 이론식에 의한 모델 및 수치해석 결과와의 비교를 통해 보다 간편한 지표침하 예측 S-모델을 개발하였다. 이를 위해 전체 굴착 구간 중, 대표 station을 선정하여 횡방향 지표침하 특성과 굴착 진행에 따른 종방향 지표침하 특성을 분석하였다. 분석 결과를 바탕으로 횡방향 지표침하 형태는 이완영역과 탄성영역으로 구성된다고 가정하고 실제 계측 자료와의 비교를 통해 최대 지표침하량과 침하 영향 범위를 산정할 수 있는 모델을 제안하였다. 이에 의하면 굴착 진행에 따른 종방향 지표침하 형태는 3차 함수 특성과 유사하였으며 각각의 계수를 터널 직경 및 토피고의 함수로 하여 S-모델을 제안하였고, 실제 계측 값 및 수치해석 결과와 상당히 유사한 형태의 지표침하를 얻을 수 있었다. 따라서 본 연구 결과를 통해 다소 연약한 풍화토, 풍화암 지층을 통과하는 쉴드 TBM 굴착 시공 시, 간편 S-모델을 이용하여 굴착에 따른 지표 침하의 예측이 가능할 것으로 판단된다.

키워드
쉴드 TBM
지표침하량
갭 파라미터
유한요소해석
세그먼트
S-모델
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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 : 15
  • No :3
  • Pages :271-287
  • Received Date : 2013-04-22
  • Revised Date : 2013-04-27
  • Accepted Date : 2013-05-06
  • DOI :https://doi.org/10.9711/KTAJ.2013.15.3.271
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