[논문]토압식 쉴드 TBM 굴착에 따른 지반침하 거동 평가에 관한 해석적 기초연구

안준범; 강석준; 김정주; 김경열; 조계춘

doi:10.9711/ktaj.2021.23.3.183

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

Journal of Korean Tunnelling and Underground Space Association = 한국터널지하공간학회논문집, v.23 no.3, 2021년, pp.183 - 198

안준범 (한국과학기술원 건설및환경공학과) , 강석준 (한국과학기술원 건설및환경공학과) , 김정주 (한전 전력연구원 차세대송변전연구소) , 김경열 (한전 전력연구원 차세대송변전연구소) , 조계춘 (한국과학기술원 건설및환경공학과)

초록
AI-Helper

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 영향 인자들과 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.

Abstract ▼ AI-Helper

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.

주제어

표/그림 (12)

그림 Fig. 1. Schematic diagram of ground loss due to excavation face instability
그림 Fig. 2. Schematic diagram of tail void backfill grouting properties transition
표 Table 1. Ground properties of target site (Chakeri et al., 2013)
그림 Fig. 3. Sketches of an adopted mesh: only half is shown based on x = 0
표 Table 2. Input properties of structures (Chakeri et al., 2013)
그림 Fig. 4. Designed sequences for simulating EPB shield TBM excavation in numerical modelling
표 Table 3. Numerical test conditions
그림 Fig. 5. Settlement trough formation at control group (FPR = 0.6, BPR = 1.1)
그림 Fig. 6. Effect of FPR on surface settlement development
그림 Fig. 7. Effect of BPR on longitudinal settlement trough
그림 Fig. 8. Effect of BPR and constrained modulus of grout on settlement
그림 Fig. 9. Correlations between analytical model coefficients based on numerical results

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상세보기
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