Assessment of reliability and maintainability of earth pressure balance tunnel boring machine (EPBTBM) – An approach

2022 ◽  
Vol 121 ◽  
pp. 104337
Author(s):  
Anil Kumar Agrawal ◽  
Somnath Chattopadhyaya ◽  
V.M.S.R. Murthy ◽  
Adesh Kumar Adesh
Keyword(s):  
Earth Pressure ◽  
Tunnel Boring Machine ◽  
Pressure Balance ◽  
Tunnel Boring ◽  
Earth Pressure Balance

As-Encountered Prediction of Tunnel Boring Machine Performance Parameters using Recurrent Neural Networks

2020 ◽  
Vol 2674 (10) ◽  
pp. 241-249
Author(s):  
Kabir Nagrecha ◽  
Luis Fisher ◽  
Michael Mooney ◽  
Tonatiuh Rodriguez-Nikl ◽  
Mehran Mazari ◽  
...  
Keyword(s):  
Neural Networks ◽  
Recurrent Neural Networks ◽  
Precast Concrete ◽  
Earth Pressure ◽  
Tunnel Boring Machine ◽  
Operational Parameters ◽  
Pressure Balance ◽  
Tunnel Boring ◽  
Machine Performance ◽  
Earth Pressure Balance

The earth pressure balance tunnel boring machine (TBM) is advanced excavation machinery used to efficiently drill through subsurface ground layers while placing precast concrete tunnel segments. They have become prevalent in tunneling projects because of their adaptability, speed, and safety. Optimal usage of these machines requires information and data about the soil of the worksite that the TBM is drilling through. This paper proposes the utilization of artificial intelligence and machine learning, particularly recurrent neural networks, to predict the operational parameters of the TBM. The proposed model utilizes only performance data from excavation segments before the location of the machine as well as its current operating parameters to predict the as-encountered parameters. The proposed method is evaluated on a dataset collected during a tunneling project in North America. The results demonstrate that the model is effective in predicting operation parameters. To address the potential issue of gathering sufficient data to retrain the model, the possibility of transferring the trained model from one tunnel to another is tested. The results suggest that the model is capable of performing accurately with minimal or even no re-training.

Ground conditioning for earth pressure balance machine tunneling

2001 ◽  
Vol 7 (1) ◽  
pp. 3-11
Author(s):  
Christoph Michael Goss
Keyword(s):  
Earth Pressure ◽  
Tunnel Boring Machine ◽  
Soft Ground ◽  
Pressure Balance ◽  
Machine Method ◽  
Tunnel Boring ◽  
Ground Modification ◽  
Earth Pressure Balance ◽  
Earth Pressure Balance Machine

Abstract The objective of this paper is to provide insight to the application of state-of-the-art ground modification technology for Earth Pressure Balance (EPB) soft ground tunneling. The paper reflects data from a wide array of sources including conference proceedings, trade journal articles, manufacturer publications, books and personal experience. The paper first introduces the concept of soft ground tunneling and then discusses the Earth Pressure Balance Tunnel Boring Machine method. The bulk of the paper is spent discussing ground-conditioning agents, particularly foam. Use of, quantities, theory behind them, environmental impact, lab testing, and effects of foams are described. The paper concludes with a brief case study of the Sheppard Subway Twin Tunnels in Toronto, Canada. Attached to the paper is a comprehensive literature search on EPB tunneling, particularly with regards to foam use.

scholarly journals Dispersant for Reducing Mud Cakes of Slurry Shield Tunnel Boring Machine in Sticky Ground

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shisen Zhao ◽  
Shuchen Li ◽  
Zeen Wan ◽  
Manling Wang
Keyword(s):  
Earth Pressure ◽  
Tunnel Boring Machine ◽  
Mitigation Measures ◽  
Shield Tunnel ◽  
Pressure Balance ◽  
Tunnel Boring ◽  
Mud Cake ◽  
Lower Viscosity ◽  
Earth Pressure Balance ◽  
Slurry Shield

When a slurry shield tunnel boring machine (TBM) encounters sticky ground during tunneling, mud cakes often occur on the cutter head due to the high stickiness of soil. The mud cakes caused several negative issues, such as high torque demand, advancement rate reduction, and additional costs. Existing studies have largely focused on Earth pressure balance TBMs; research on formation and mitigation measures of mud cakes in slurry shield TBMs is limited. Therefore, this study proposes the addition of dispersant to the slurry to prevent mud cakes during the tunneling of slurry shield TBMs by reducing stickiness of excavated clay. The basic properties of slurry were measured experimentally, and the effectiveness of dispersant in reducing the potential for mud cakes was investigated through mixing tests and viscosity experiments. A statistical analysis of the data was performed to determine relationships between slurry properties and material behaviors. The results showed that the slurry with dispersant had a lower viscosity and formed filter cakes more quickly, thereby meeting the performance requirements of a supporting fluid for slurry shield TBMs. Further, dispersant effectively reduced the empirical stickiness ratio and suspension viscosity. Therefore, a slurry with an appropriate dispersant content could effectively reduce the potential for mud cake formation.

SELECTION AND CALCULATION OF CUTTING HEAD FOR EARTH PRESSURE BALANCE TUNNEL BORING MACHINES

2019 ◽  
Vol 4 (1) ◽  
pp. 139-149
Author(s):  
A.V. Polyakov ◽  
◽  
A.B. Zhabin ◽  
P.N. Chebotarev ◽  
W.H. Khachaturian ◽  
...  
Keyword(s):  
Earth Pressure ◽  
Pressure Balance ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Cutting Head ◽  
Ground Conditions ◽  
Earth Pressure Balance ◽  
Boring Machines

Considered selection and calculation of cutting head for earth pressure balance tunnel boring machines. The conditions of choice of the working body are defined. The possible types of cutting heads and the features of choosing the type of their supports and drive mechanisms are described. The dependence for the calculation of the torque on the working body is given. The recommendations on the choice of the degree of openness of the cutting head, the type of destructive tool, expansion devices and seals of the bearing units of the drive of the working body depending on the ground conditions of penetration.

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