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Study on the effect of tail void grouting on the short- and long-term surface settlement in the shield TBM Tunneling using numerical analysis

쉴드TBM터널에서 뒤채움 주입이 지반의 단기·장기 침하에 미치는 영향에 대한 수치해석적 연구

Ju-Young Oh1
,
Hyunku Park1*
,
Dohyoung Kim2
,
Seokbue Chang3
,
Seungbok Lee3
,
Hangseok Choi4
오 주영1
,
박 현구1*
,
김 도형2
,
장 석부3
,
이 승복3
,
최 항석4
1Samsung C&T Corporation, Civil Business Unit, Manager
2Samsung C&T Corporation, Civil Business Unit, Manager
3Samsung C&T Corporation, Civil Business Unit, Director
4School of Civil, Environmental and Architectural Engr., Korea Univ. Professor
1삼성물산 건설부분 Civil사업부 책임
2삼성물산 건설부분 Civil사업부 책임
3삼성물산 건설부분 Civil사업부 수석
4고려대학교 건축·사회환경공학부 교수
*교신저자. *Corresponding Author. 
31 March 2017. pp. 265-281
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Abstract

For shallow tunnel constructions, settlement of the ground surface is a main issue. Recent technical developments in shield TBM tunneling technique have enabled a decrease in such settlements based on tunneling with ground deformation controls. For this objective, the tail void grouting is a common practice. Generally surface settlements in a soil of low permeability occur during a tunnel construction but also during a long period after completion of the tunnel. The long-term settlements occur mainly due to consolidation around the tunnel. The consolidation process is caused and determined by the tail void grouting which leads to an excess pore water pressure in the vicinity of the tunnel. Because of this, the grouting pressure has a strong effect on the long-term settlements in the shield tunneling. In order to investigate this effect, a series of coupled hydro-mechanical 3D finite element simulations have been performed. The results show that an increase in grouting pressure reduces the short-term settlements, but in many cases, it doesn’t lead to a reduction of the final settlements after the completion of consolidation. Thereby, the existence of a critical grouting pressure is identified, at which the minimal settlements are expected.

Keywords
쉴드 TBM
뒤채움 그라우팅
침하
압밀
체적 변화
한계 주입압

얕은 터널의 시공에 있어 지표 침하는 주요 관리 사항으로 쉴드 TBM 기술을 적용함으로써 굴착 중 지반 변형의 제어를 통하여 침하를 경감시키는 것이 가능하며, 특히 뒤채움 주입은 침하 경감의 목적으로 쉴드 공법에서는 일반적으로 적용되는 기술이다. 투수성이 낮은 지반에서의 TBM 시공에 의한 지표 침하는 터널 시공 중에 발생할 뿐만 아니라, 터널 관통 후에도 장기간에 걸쳐 발생한다. 장기 침하는 주로 터널 주변의 압밀에 의해 발생되고, 이 압밀 과정은 터널 주변에 과잉간극수압을 유발하는 뒤채움 주입에 의해 영향을 받게 되며 결과적으로 쉴드 TBM 터널에서는 뒤채움 주입이 장기 침하에 큰 영향을 주게 된다. 본 연구에서는 쉴드 TBM 공법 중 뒤채움 주입이 지표 침하에 미치는 영향을 파악하기 위해 3차원 응력-간극수압 연계해석을 수행하였다. 해석 결과 뒤채움 주입압의 증가는 단기 침하를 경감시키지만, 다수의 경우에서 장기 침하의 감소에 기여를 하지 않는 것으로 나타났다. 또한, 장기 침하를 최소한으로 제한할 수 있는 한계 주입압의 존재를 확인하였다

키워드
Shield TBM
Tail void grouting
Settlement
Consolidation
Volume change
Critical grouting pressure
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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 : 19
  • No :2
  • Pages :265-281
  • Received Date : 2017-03-17
  • Revised Date : 2017-03-27
  • Accepted Date : 2017-03-29
  • DOI :https://doi.org/10.9711/KTAJ.2017.19.2.265
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