Soil conditioning for EPB shield tunnelling

2014 ◽  
Vol 18 (3) ◽  
pp. 831-836 ◽  
Author(s):  
D. Peila
Keyword(s):  
Soil Conditioning ◽  
Shield Tunnelling ◽  
Epb Shield

Soil conditioning in EPB shield tunnelling – An overview of laboratory tests

2019 ◽  
Vol 12 (5) ◽  
pp. 491-498 ◽  
Author(s):  
Daniele Peila ◽  
Daniele Martinelli ◽  
Carmine Todaro ◽  
Andrea Luciani
Keyword(s):  
Laboratory Tests ◽  
Soil Conditioning ◽  
Shield Tunnelling ◽  
Epb Shield

scholarly journals Application Ranges of EPB Shield TBM in Weathered Granite Soil: A Laboratory Scale Study

2021 ◽  
Vol 11 (7) ◽  
pp. 2995
Author(s):  
Tae-Hwan Kim ◽  
In-Mo Lee ◽  
Hee-Young Chung ◽  
Jeong-Jun Park ◽  
Young-Moo Ryu
Keyword(s):  
Water Content ◽  
Upper And Lower Bounds ◽  
Shield Tunnel ◽  
Particle Crushing ◽  
Pressure Balance ◽  
Soil Conditioning ◽  
Weathered Granite ◽  
Weathered Granite Soil ◽  
Granite Soil ◽  
Epb Shield

Soil conditioning is a key factor in increasing tunnel face stability and extraction efficiency of excavated soil when excavating tunnels using an earth pressure balance (EPB) shield tunnel boring machine (TBM). Weathered granite soil, which is abundant in the Korean Peninsula (also in Japan, Hong Kong, and Singapore), has different characteristics than sand and clay; it also has particle-crushing characteristics. Conditioning agents were mixed with weathered granite soils of different individual particle-size gradations, and three characteristics (workability, permeability, and compressibility) were evaluated to find an optimal conditioning method. The lower and upper bounds of the water content that are needed for a well-functioning EPB shield TBM were also proposed. Through a trial-and-error experimental analysis, it was confirmed that soil conditioning using foam only was possible when the water content was controlled within the allowable range, that is, between the upper and lower bounds; when water content exceeded the upper bound, soil conditioning with solidification agents was needed along with foam. By taking advantage of the particle-crushing characteristics of the weathered granite soil, it was feasible to adopt the EPB shield TBM even when the soil was extremely coarse and cohesionless by conditioning with polymer slurries along with foam. Finally, the application ranges of EPB shield TBM in weathered granite soil were proposed; the newly proposed ranges are wider and expanded to coarser zones compared with those proposed so far.

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

Soil Conditioning for EPB Shield Tunneling in Silty Clay and Weathered Mudstone

2021 ◽  
Vol 21 (9) ◽  
pp. 06021020
Author(s):  
Zeen Wan ◽  
Shuchen Li ◽  
Chao Yuan ◽  
Shisen Zhao ◽  
Manling Wang ◽  
...  
Keyword(s):  
Silty Clay ◽  
Shield Tunneling ◽  
Soil Conditioning ◽  
Epb Shield
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