Comparison of earth pressure balance and slurry tunnel boring machines used for tunnelling in chalk

2018 ◽  
Author(s):  
C. Warren ◽  
T. Newman ◽  
N.W. Hadlow
Keyword(s):  
Earth Pressure ◽  
Pressure Balance ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Earth Pressure Balance ◽  
Boring Machines

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.

scholarly journals A Rapid Experimental Procedure to Assess Environmental Compatibility of Conditioning Mixtures Used in TBM-EPB Technology

2020 ◽  
Vol 10 (12) ◽  
pp. 4138
Author(s):  
Irene Bavasso ◽  
Giorgio Vilardi ◽  
Diego Sebastiani ◽  
Anita Di Giulio ◽  
Marta Di Felice ◽  
...  
Keyword(s):  
Urban Areas ◽  
Earth Pressure ◽  
Rapid Test ◽  
Pressure Balance ◽  
Tunnel Boring Machines ◽  
Soil Humus ◽  
Bacillus Clausii ◽  
Earth Pressure Balance ◽  
Boring Machines ◽  
Short Time

Earth Pressure Balance (EPB) Tunnel Boring Machines (TBM) are currently the most widely used machines to perform tunnel excavation, particularly in urban areas. This technology involves the injection of chemicals as conditioning mixtures, which commonly raises concerns limiting the reuse of soils after excavation. This study deals with the prospect of a simplified, rapid and replicable methodology for the evaluation of the biodegradability of these conditioning mixtures. For this purpose, the biodegradation of three commercial conditioning mixtures was investigated in closed bottle tests by investigating the effect of different mixtures dosages and two different inocula (soil humus and Bacillus Clausii). While using soil humus as inoculum, a comparative study of biodegradation of the three investigated mixtures was successfully carried out; in the case of Bacillus Clausii, it was not possible to make a comparison between the different formulations in a short time. The adoption of soil humus satisfied only the criteria of rapid test, while the Bacillus Clausii, as specific inoculum, can meet the criteria of replicable results. For this reason, in the second part of this experimental study, a rapid and replicable procedure was proposed and validated. A kinetic study of organic carbon removal was also carried out.

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 CHOOSING TBM FOR TABRIZ SUBWAY USING MULTI CRITERIA METHOD

2010 ◽  
Vol 16 (4) ◽  
pp. 531-539 ◽  
Author(s):  
Kamaladdin Edalat ◽  
Mohammad Javad Vahdatirad ◽  
Hadi Ghodrat ◽  
Sarah Firouzian ◽  
Amin Barari
Keyword(s):  
Urban Areas ◽  
Earth Pressure ◽  
Environmental Parameters ◽  
Pressure Balance ◽  
Underground Engineering ◽  
Railway Line ◽  
Earth Pressure Balance ◽  
Boring Machines ◽  
Under Construction ◽  
High Level

The world of underground engineering and construction has acquired a wide‐ranging and high‐level experience on tunnel construction with Tunnel Boring Machines (TBM) and nowadays remarkable progresses are traceable in the number of tunnels that are becoming longer, going deeper, and growing larger in diameter and in other words becoming more difficult to realize. Tabriz‐one of the big cities in northern west of Iran has four subway lines which are under construction or investigation. The phase1 design of Tabriz urban railway line 2 (TURL2) has completely been done. Method statement of this line in the length of about 20 km and much interference due to tunneling in urban area dictates the application of TBM. Two kinds of TBM such as EPB (earth pressure balance) and SS (slurry shield) are usually used for urban areas. In this paper, the process of choosing TBM for TURL2 using MCA method (Multi Criteria Analysis) is expressed. Generally in this method some technical, economical and environmental parameters affected the TBM type are identified and taken into account by assigned weights related to the case study. Finally the results show that EPB‐TBM will be more appropriate choice for TURL2 excavation. Santrauka Potemine intinerija ir statyba labai išplito bei igijo aukšto lygmens patirti tuneliu statyboje emus naudoti tuneliu gretimo mašinas (TGM). Šis statybos būdas taikytas statant daug tuneliu, kurie vis ilgeja, gileja ir plateja pagal skersmeni, t. y. statyba realizuojama sunkiau. Tabrize – viename iš didtiausiu šiaures vakaru Irano miestu – yra keturios statomos arba planuojamos statyti metro linijos. Tabrizo miesto geletinkelio 2‐os linijos (TMG2L) pirmoji projektavimo faze yra baigta. Jos ilgis – 20 km, daug jos atkarpu eina po teme. Poteminems atkarpoms pastatyti gali būti naudojamos dvieju tipu TGM. Tai temes slegines pusiausvyros mašina (TSPM) arba suspensijos skydo mašinos (SSM). Šiame straipsnyje nagrinejamas TGM pasirinkimas tarp TSPM ir SSM taikant daugiatiksli sprendimu priemimo metoda (DSPM). Šiam metodui pritaikyti apibretiami tam tikri techniniai, ekonominiai ir aplinkos rodikliai, darantys itaka TGM tipui. Rodikliams priskiriami svoriai. DSPM taikymo rezultatai parode, kad TSPM yra tinkamesne TMG2L kasti.

Comparison of predicted and actual states in tunnels: lessons to be learned from the Gerede Water Transmission Tunnel, Turkey

2020 ◽  
pp. qjegh2020-060
Author(s):  
Ahmet Apaydin
Keyword(s):  
Water Pressure ◽  
Earth Pressure ◽  
High Water ◽  
Pressure Balance ◽  
Earth Pressure Balance Shield ◽  
Completion Date ◽  
Earth Pressure Balance ◽  
Boring Machines ◽  
Water Transmission ◽  
Route Cost

The Gerede Tunnel is a large inter-basin project in Turkey. As with many long tunnels, some of the predictions in the project report and the tender contract have not been realized. Completion of the tunnel has been delayed for more than twice the time given in the tender contract. Unexpectedly complex geological–tectonic–hydrogeological conditions and the selection of tunnel-boring machines (TBMs) are the main reasons for this long delay. There were some discrepancies between the predicted and actual geology. The groundwater pressure encountered was much higher than expected. Plastic clays in the limestone and breccia and loose agglomerates with a high water pressure in the faults decreased the advance rate and led to several long stoppages. One of the three double-shield TBMs became stuck in the tunnel and could not be recovered. The last quarter of the tunnel was excavated more slowly, but without severe problems, by a modified earth pressure balance shield TBM. As a result, the TBM type, drive direction, length, route, cost and completion date of the Gerede Tunnel have all changed.

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