Face Stability Analysis of EPB Shield Tunnels in Dry Granular Soils Considering Nonuniform Chamber Pressure and a Dynamic Excavation Process

2021 ◽  
Vol 21 (6) ◽  
pp. 04021074
Author(s):  
Xiongyu Hu ◽  
Chuan He ◽  
Gabriel Walton ◽  
Yong Fang
Keyword(s):  
Stability Analysis ◽  
Chamber Pressure ◽  
Granular Soils ◽  
Face Stability ◽  
Excavation Process ◽  
Epb Shield

Face stability analysis of EPB shield tunnel in dense sand stratum considering the evolution of failure pattern

2021 ◽  
Vol 130 ◽  
pp. 103890
Author(s):  
Cheng Cheng ◽  
Pengpeng Ni ◽  
Wen Zhao ◽  
Pengjiao Jia ◽  
Song Gao ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Failure Pattern ◽  
Shield Tunnel ◽  
Face Stability ◽  
Dense Sand ◽  
Sand Stratum ◽  
Epb Shield

Three-dimensional face stability analysis of shallow tunnels using numerical limit analysis and material point method

2021 ◽  
Vol 112 ◽  
pp. 103904
Author(s):  
Fabricio Fernández ◽  
Jhonatan E.G. Rojas ◽  
Eurípedes A. Vargas ◽  
Raquel Q. Velloso ◽  
Daniel Dias
Keyword(s):  
Stability Analysis ◽  
Limit Analysis ◽  
Three Dimensional ◽  
Material Point Method ◽  
Material Point ◽  
Point Method ◽  
Face Stability ◽  
Shallow Tunnels ◽  
Dimensional Face

Face Stability Analysis of Slurry Shield Tunnels in Rock-Soil Interface Mixed Ground

2021 ◽  
Author(s):  
Ping Lu ◽  
Dajun Yuan ◽  
Jian Chen ◽  
Dalong Jin ◽  
Jun Wu ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Face Stability ◽  
Mixed Ground ◽  
Slurry Shield ◽  
Soil Interface

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.

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