A preliminary study for numerical and analytical evaluation of surface settlement due to EPB shield TBM excavation

Jun-Beom An; Seok-Jun Kang; Jung Joo Kim; Kyoung Yul Kim; Gye-Chun Cho

doi:10.9711/KTAJ.2021.23.3.183

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2021 Vol.23, Issue 3 Preview Page Next Page

Research Paper

A preliminary study for numerical and analytical evaluation of surface settlement due to EPB shield TBM excavation 토압식 쉴드 TBM 굴착에 따른 지반침하 거동 평가에 관한 해석적 기초연구

31 May 2021. pp. 183-198

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Abstract

The EPB (Earth Pressure Balanced) shield TBM method restrains the ground deformation through continuous excavation and support. Still, the significant surface settlement occurs due to the ground conditions, tunnel dimensions, and construction conditions. Therefore, it is necessary to clarify the settlement behavior with its influence factors and evaluate the possible settlement during construction. In this study, the analytical model of surface settlement based on the influence factors and their mechanisms were proposed. Then, the parametric study for controllable factors during excavation was conducted by numerical method. Through the numerical analysis, the settlement behavior according to the construction conditions was quantitatively derived. Then, the qualitative trend according to the ground conditions was visualized by coupling the numerical results with the analytical model of settlement. Based on the results of this study, it is expected to contribute to the derivation of the settlement prediction algorithm for EPB shield TBM excavation.

Keywords

EPB shield TBM

Surface settlement

Face pressure

Tail void backfill

Injection pressure

토압식 쉴드 TBM 공법은 커터헤드 후면 챔버에 버력을 채워 막장 안정성을 확보하는 공법으로, 연속적인 굴착 및 지보를 통해 지반 변형을 억제하는 것으로 알려져 있다. 하지만 여전히 지반 조건, 터널 크기, 그리고 시공 조건에 의해 무시할 수 없는 지반 침하가 발생하는 실정이다. 따라서 지반침하 영향인자에 의한 침하 거동을 명확하게 이해하고 이를 기반으로 시공 중 발생 가능한 지반침하를 평가할 필요가 있다. 본 연구에서는 토압식 쉴드 TBM 시공 시의 지반침하 주요 영향인자들과 침하 발생 메커니즘이 반영된 해석 모델(analytical model)을 제시하였고, 시공 중 조절 가능한 인자들에 대한 매개변수 해석을 수치해석 기법을 통해 수행하였다. 수치해석 결과를 통해 시공 조건에 의한 침하 거동을 정량적으로 도출하였으며, 침하 해석 모델과의 연계를 통해 지반 조건에 따른 정성적인 경향성을 도시하였다. 본 연구 결과를 통해 토압식 쉴드 TBM 굴착에 의한 침하예측모델 도출에 기여할 것으로 기대된다.

키워드

토압식 쉴드 TBM

지반침하

막장압

테일 보이드 뒷채움

뒷채움 주입압력

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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 : 23
No :3
Pages :183-198
Received Date : 2021-04-20
Revised Date : 2021-05-20
Accepted Date : 2021-05-20
DOI :https://doi.org/10.9711/KTAJ.2021.23.3.183

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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