Pressure Infiltration Characteristics of Foam for EPB Shield Tunnelling

2019 ◽  
pp. 235-239
Author(s):  
Tao Xu ◽  
Adam Bezuijen ◽  
Wan-Huan Zhou
Keyword(s):  
Pressure Infiltration ◽  
Shield Tunnelling ◽  
Epb Shield

scholarly journals Numerical Simulation of EPB Shield Tunnelling with TBM Operational Condition Control Using Coupled DEM–FDM

2021 ◽  
Vol 11 (6) ◽  
pp. 2551
Author(s):  
Hyobum Lee ◽  
Hangseok Choi ◽  
Soon-Wook Choi ◽  
Soo-Ho Chang ◽  
Tae-Ho Kang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Tunnel Boring Machine ◽  
Chamber Pressure ◽  
Screw Conveyor ◽  
Shield Tunnel ◽  
Pressure Balance ◽  
Operational Conditions ◽  
Shield Tunnelling ◽  
Epb Shield

This study demonstrates a three-dimensional numerical simulation of earth pressure balance (EPB) shield tunnelling using a coupled discrete element method (DEM) and a finite difference method (FDM). The analysis adopted the actual size of a spoke-type EPB shield tunnel boring machine (TBM) consisting of a cutter head with cutting tools, working chamber, screw conveyor, and shield. For the coupled model to reproduce the in situ ground condition, the ground formation was generated partially using the DEM (for the limited domain influenced by excavation), with the rest of the domain being composed of FDM grids. In the DEM domain, contact parameters of particles were calibrated via a series of large-scale triaxial test analyses. The model simulated tunnelling as the TBM operational conditions were controlled. The penetration rate and the rotational speed of the screw conveyor were automatically adjusted as the TBM advanced to prevent the generation of excessive or insufficient torque, thrust force, or chamber pressure. Accordingly, these parameters were maintained consistently around their set operational ranges during excavation. The simulation results show that the proposed numerical model based on DEM–FDM coupling could reasonably simulate EPB driving while considering the TBM operational conditions.

Laboratory tests on conditioning the sandy cobble soil for EPB shield tunnelling and its field application

2020 ◽  
Vol 105 ◽  
pp. 103512
Author(s):  
Qianwei Xu ◽  
Lianyang Zhang ◽  
Hehua Zhu ◽  
Zhengyu Gong ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Laboratory Tests ◽  
Field Application ◽  
Shield Tunnelling ◽  
Epb Shield
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