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Numerical investigation on the effect of backfill grouting on ground behavior during shield TBM tunneling in sandy ground

사질토 지반을 통과하는 쉴드 TBM에서 뒤채움 그라우팅이 지반 거동에 미치는 영향에 대한 수치해석적 연구

  • Oh, Ju-Young (Infrastructure Division, Samsung C&T Corporation) ;
  • Park, Hyunku (Infrastructure Division, Samsung C&T Corporation) ;
  • Chang, Seokbue (Infrastructure Division, Samsung C&T Corporation) ;
  • Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 오주영 (삼성물산 건설부문 인프라본부) ;
  • 박현구 (삼성물산 건설부문 인프라본부) ;
  • 장석부 (삼성물산 건설부문 인프라본부) ;
  • 최항석 (고려대학교 건축.사회환경공학부)
  • Received : 2018.01.29
  • Accepted : 2018.03.05
  • Published : 2018.03.31

Abstract

The shield TBM method is widely adopted for tunneling works in urban area because it has more beneficial ways to control settlement at ground surface than conventional mined tunneling. In the shield tunneling, backfill grouting at tail void is crucial because it is supposed not only to restraint ground deformation around tail void during excavation but also to compensate precedent ground settlement by pushing up the ground with highly pressurized grout. However, the tail void grouting has been found to be ineffective for settlement compensation particularly in sandy ground, which might be caused by complicate interaction between ground and tail void grouting. In this paper, the effects of tail void grouting on behavior of ground in shield TBM tunneling were investigated based on 3-dimensional finite element analyses. The results of numerical analyses indicated that backfill grouting actually reduces settlement by degrading settlement increasing rate in excavation, which means decrease of volume loss. Meanwhile, the grouting could not contribute to compensate the precedent settlement, because reduction of volume loss by grouting was found to be counterbalanced by volume change of ground.

Acknowledgement

Grant : 고수압 초장대 해저터널 기술자립을 위한 핵심요소 기술개발

Supported by : 국토교통과학기술진흥원

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