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

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Case study of volume loss estimation during slurry tbm tunnelling in weathered zone of granite rock

화강풍화대를 통과하는 슬러리 TBM의 체적손실 산정에 대한 사례 연구

  • 박현구 (삼성물산 건설부문 Civil사업부) ;
  • 오주영 (삼성물산 건설부문 Civil사업부) ;
  • 장석부 (삼성물산 건설부문 Civil사업부) ;
  • 이승복 (삼성물산 건설부문 Civil사업부)
  • Received : 2015.12.15
  • Accepted : 2016.01.08
  • Published : 2016.01.30
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Abstract

This paper presents a case study on the ground settlement and volume loss estimation for slurry pressure balanced shield TBM tunnelling in weathered zone of granite rock. Settlement at each stage of shield tunnelling was analyzed and the volume losses and settlement trough factors were estimated from observations. In addition, using the existing volume loss evaluation method in literature, volume losses were estimated considering ground properties and actual driving parameters. Most of ground settlement occurred during passage of shield skin passage and after backfill grouting, and the measured total volume loss and trough curves appeared to coincide with literature. Shield and tail loss obtained from field measurement were found to be around 90% and 60% of the predictions, where tail loss indicated larger deviation than shield loss.

본 논문에서는 화강풍화대를 통과하는 슬러리 TBM 굴진 중 지표 침하 및 체적손실 산정에 관한 사례 연구를 수행하였다. 터널 천단 침하 계측 결과로부터 TBM 굴진 단계별 침하 발생 경향을 분석하였고, 횡방향 지표 침하 트라프로부터 굴진 중 체적손실 및 트라프 변수를 산정하였다. 또한, 체적손실 산정 모델을 이용하여 지반 특성과 굴진 중 측정된 기계데이터가 반영된 굴진 단계별 체적손실을 산정하였으며, 이를 실제 계측 결과와 비교 분석하였다. 슬러리 TBM의 경우 대부분의 지표침하는 쉴드 본체 통과 및 뒤채움 주입 이후 발생하는 것으로 나타났고 문헌에 보고된 총 체적손실 및 트라프 곡선 형태가 확인되었다. 실제 굴진 중 체적손실은 굴진 단계별로 쉴드손실 예측값의 90%, 테일부 손실 예측값의 60% 수준으로 분석되었고, 쉴드 손실에 비해 테일부 손실의 편차가 큰 것으로 나타났다.

Keywords

References

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