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Rasekh, E., Lotfi, . (2023). Optimizing the performance of the EPB Tunnel Boring Machine of Isfahan metro line 2 against wear and material transfer based on the adaptability of the machine to the project ground with the help of the numerical modeling in EDEM software. Electronic and Cyber Defense, 4(2), 1-11.
Erfan Rasekh; ِDavood Lotfi. "Optimizing the performance of the EPB Tunnel Boring Machine of Isfahan metro line 2 against wear and material transfer based on the adaptability of the machine to the project ground with the help of the numerical modeling in EDEM software". Electronic and Cyber Defense, 4, 2, 2023, 1-11.
Rasekh, E., Lotfi, . (2023). 'Optimizing the performance of the EPB Tunnel Boring Machine of Isfahan metro line 2 against wear and material transfer based on the adaptability of the machine to the project ground with the help of the numerical modeling in EDEM software', Electronic and Cyber Defense, 4(2), pp. 1-11.
Rasekh, E., Lotfi, . Optimizing the performance of the EPB Tunnel Boring Machine of Isfahan metro line 2 against wear and material transfer based on the adaptability of the machine to the project ground with the help of the numerical modeling in EDEM software. Electronic and Cyber Defense, 2023; 4(2): 1-11.

Optimizing the performance of the EPB Tunnel Boring Machine of Isfahan metro line 2 against wear and material transfer based on the adaptability of the machine to the project ground with the help of the numerical modeling in EDEM software

علوم و فنون سازندگی
Volume 4, Issue 2 - Serial Number 12, July 2024, Pages 1-11    PDF (1.24 M)
Document Type: Original Article
Authors
Erfan Rasekh* 1; ِDavood Lotfi2
1Amirkabir university of Tehran
2Tunnelsaz Machine
Receive Date: 01 September 2023,  Accept Date: 12 June 2024 
Abstract
In this article, for the first time in Iran, by using discrete element Method analysis, the main weaknesses in the excavation of Isfahan metro line 2 using EPB drilling machine were identified and practical solutions were proposed to solve it. The machine geometry was modeled and imported into the EDEM discrete element software for the second part of the analysis. The parameters of the tunnel lining, soil and conditioned soil were calibrated using the laboratory data set of sieve analysis test, direct shear test and slump.The results showed that the lower third of the chamber and the enclosed area between the arms of the device have a high clogging potential and the particles have a weak velocity field in this area. Two optimization plans were presented with the help of installing a new mixing bar on the cutterhead, and the results showed that the second plan, where the mixing bar is installed on the arm of the cutterhead, a significant improvement in the speed of the particles happens, and the average speed of the particles in the central region sometimes improves up to 5 times. First optimization plan one did not work well and only partially improved the particle velocity field. As another solution to optimize and improve the particle velocity field in the lower third of the chamber space, the use of waterjet rows was suggested, and with the help of software, the critical area was identified and the best place to install waterjet lines was determined.
Keywords
wear; clogging; discrete element method; numerical model; EPB
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