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2018 Vol.20, Issue 2 Preview Page
Evaluation of the backfill injection pressure and its effect on ground settlement for shield TBM using numerical analysis

쉴드 TBM 뒤채움압 산정 및 침하영향에 대한 수치해석적 연구

Chang-Kyun Ahn1
,
Jeong-Seon Yu1
,
Seok-Won Lee2*
안 창균1
,
유 정선1
,
이 석원2*
1Master, Konkuk University, Dept. of Civil and Environmental Engineering
2Professor, Konkuk University, Dept. of Civil and Environmental Engineering
1건국대학교 사회환경공학과 석사
2건국대학교 사회환경공학과 교수
*교신저자. *Corresponding Author. 
31 March 2018. pp. 269-286
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Abstract

Backfill injection pressure in shield TBM affects not only ground settlement but also adjacent underground structures. Therefore, it is essential to estimate a suitable backfill injection pressure in advance in design stage. In this paper, seven suggested equations worldwide to calculate the backfill injection pressure were reviewed and compared. By assuming 6 cases of virtual ground condition, backfill injection pressures were calculated and analyzed. it was confirmed that the backfill injection pressure increases as the depth of overburden increases, but the increasing ratio decreases. The numerical analysis was carried out by applying the calculated backfill injection pressure to investigate the influence of backfill injection pressure on the settlement of surface and crown of tunnel. It was confirmed that the final settlement at the surface and crown of tunnel on the both unsaturated and saturated condition are more influenced by the applied face pressure than the applied backfill injection pressure. In addition, the effect of backfill injection pressure decreases as the depth of overburden increases, and the effect of backfill injection pressure increases as the applied face pressure decreases.

Keywords
Backfill injection pressure
Shield TBM
Face pressure
Ground settlement

쉴드 TBM 공사에서 뒤채움압은 지표 침하는 물론 주변 지하 구조물의 안정성에 영향을 미친다. 따라서 설계단계에서 뒤채움압을 미리 산정하는 것은 필수적이다. 본 연구에서 는 전 세계적으로 제시되어 있는 7가지 뒤채움압 산정 이론을 고찰하고 비교하였다. 6가 지의 가상 지반조건을 가정하여, 그에 따른 뒤채움압을 산정하고 분석하였다. 그 결과,토피고가 증가함에 따라 산정되는 뒤채움압이 증가하나 그 증가율은 감소함을 알 수 있었다. 또한 산정된 뒤채움압이 지표 및 천단침하에 어떻게 영향을 미치는 지를 파악하기 위하여 수치해석을 수행하였다. 그 결과, 불포화 지반조건 및 포화 지 반조건 모두에서 동일하게 지표 및 천단 침하는 뒤채움압 보다는 막장압에 더욱 영향을 받는 것을 알 수 있었다. 또한 토피 고가 증가할수록 뒤채움압의 영향이 감소하고, 적용 막장압이 감소함에 따라 뒤채움압의 영향이 증가함을 알 수 있었다.

키워드
뒤채움압
쉴드 TBM
막장압
지반 침하
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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 : 20
  • No :2
  • Pages :269-286
  • Received Date : 2018-01-05
  • Revised Date : 2018-02-02
  • Accepted Date : 2018-02-07
  • DOI :https://doi.org/10.9711/KTAJ.2018.20.2.269
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