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http://dx.doi.org/10.7474/TUS.2021.31.6.549

Numerical Evaluation of Forces on TBM during Excavation in Mixed Ground Condition by Coupled DEM-FDM  

Choi, Soon-Wook (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology)
Lee, Hyobum (Future and Fusion Lab of Architectural, Civil and Environmental Engineering, Korea University)
Choi, Hangseok (School of Civil Environmental and Architectural Engineering, Korea University)
Chang, Soo-Ho (Construction Industry Promotion Department, Korea Institute of Civil Engineering and Building Technology)
Kang, Tae-Ho (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology)
Lee, Chulho (Underground Space Safety Research Center, Korea Institute of Civil Engineering and Building Technology)
Publication Information
Tunnel and Underground Space / v.31, no.6, 2021 , pp. 549-560 More about this Journal
Abstract
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.
Keywords
Coupling method; Discrete element method; Finite difference method; Numerical analysis; Shield TBM;
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