[논문]개별요소법 및 유한차분법 연계 모델을 활용한 복합지반 TBM 굴진 시 TBM에 작용하는 힘의 수치해석적 분석

최순욱; 이효범; 최항석; 장수호; 강태호; 이철호

doi:10.7474/tus.2021.31.6.549

개별요소법 및 유한차분법 연계 모델을 활용한 복합지반 TBM 굴진 시 TBM에 작용하는 힘의 수치해석적 분석
Numerical Evaluation of Forces on TBM during Excavation in Mixed Ground Condition by Coupled DEM-FDM 원문보기

터널과 지하공간: 한국암반공학회지 = Tunnel and underground space, v.31 no.6, 2021년, pp.549 - 560

최순욱 (한국건설기술연구원 지하공간안전연구센터) , 이효범 (고려대학교 미래건설환경융합연구소) , 최항석 (고려대학교 건축사회환경공학부) , 장수호 (한국건설기술연구원 건설산업진흥본부) , 강태호 (한국건설기술연구원 지하공간안전연구센터) , 이철호 (한국건설기술연구원 지하공간안전연구센터)

초록
AI-Helper

쉴드 TBM(Tunnel Boring Machine) 굴진 시 TBM에 작용하는 커터헤드 토크, 추력, 챔버압, 상향력 등은 TBM의 굴진성능을 결정하는 데 매우 중요한 요소들이다. 그러나 균질한 지반 조건에 비해 복합지반을 굴진할 때 TBM에 작용하는 힘들은 그 경향이 달라 TBM 굴진성능을 저해할 수 있다. 따라서 본 연구에서는 복합지반 굴진이 TBM에 작용하는 토크, 추력, 챔버압, 상향력에 미치는 영향을 수치해석적으로 모사하고자 하였다. 해석 모델은 개별요소법(DEM, discrete element method)과 유한차분법(FDM, finite difference method)을 연계하는 방안을 적용한 TBM 굴진 모델을 사용하였다. 본 연구에서는 상부 화강풍화토와 하부 풍화암으로 구성된 복합지반을 굴진하는 것을 가정하여 굴진을 모사하였으며, 복합지반 경계면의 위치, 경사에 따라 TBM에 작용하는 힘에 대한 영향을 해석적으로 분석하였다.

Abstract ▼ AI-Helper

Forces exerted on a shield TBM (tunnel boring machine) such as cutter head torque, thrust force, chamber pressure, and upward force are key factors determining TBM performance. However, the forces acting on the TBM when tunnelling the mixed ground have different tendencies compared to that of the uniform ground, which could impair TBM performance. In this study, the effect of mixed ground tunnelling was numerically investigated with torque, thrust force, chamber pressure, and upward force. A coupled discrete element method (DEM) and finite difference method (FDM) model for TBM driving model was used. This numerical study simulates TBM tunnelling in mixed ground composed of upper weathered granite soil and lower weathered rock. The effect on the force acting on the TBM according to the location and slope of the boundary of the mixed ground was numerically examined.

주제어

표/그림 (14)

그림 Fig. 1. Schematics of adhesive rolling resistance linear contact model and linear contact bond model (Itasca Consulting Group Inc., 2019)
그림 Fig. 2. Configuration of triaxial test model to calibrate contact parameters of soil and rock (Lee et al., 2021)
그림 Fig. 3. Calibration results for determining contact parameters of weathered granite soil and highly weathered rock
표 Table 1. Calibrated contact parameters of weathered granite soil and weathered rock in DEM domain
그림 Fig. 4. Procedure of DEM-FDM coupled ground modeling: wall compaction and wall-zone compaction (Lee et al., 2021)
표 Table 2. Input parameters for zone elements in FDM domain
그림 Fig. 5. Verification of DEM-FDM coupling by measuring vertical and horizontal in-situ stress distribution with depth
표 Table 3. Different mixed ground conditions for TBM driving simulation
그림 Fig. 6. TBM driving numerical model after importing EPB shield TBM model (simulation case 1)
표 Table 4. Specification of EPB shield TBM for numerical model
그림 Fig. 7. Numerical simulation results: cutter head torque
그림 Fig. 8. Numerical simulation results: thrust force
그림 Fig. 9. Comparison of average chamber pressure after 200 mm advance
그림 Fig. 10. Numerical simulation results: upward force on TBM

참고문헌 (22)

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