Effect of the Replacement of Cutting Tools on the Performance of TBM in Tehran Metro Line 6

Document Type : Research Article

Authors

1 Dept. of Mining, Tarbiat Modares University, Tehran, Iran

2 Ahab construction company, Tehran

10.29252/anm.2020.13703.1438

Abstract

Summary
In this paper, the effect of replacing disc cutters with ripper tools on the performance of a TBM in Tehran Metro Line 6 is investigated by comparing the value of operating parameters of TBM before and after the replacement. The results show that this replacement has a positive impact on the TBM performance.
 
 
 
Introduction
Improvement of the performance of the TBM machine in tunneling has always been in the spotlight of research and development. The type of cutting tool, which is selected based on the mechanical properties of the formations along the tunnel route, could affect the efficiency and production rate in tunneling. In Tehran Metro Line 6, the consumption of disc cutters increased with decreasing the efficiency of disc cutters, along with increasing the value of thrust and torque. Hence, some of the disc cutters of the TBM were replaced with ripper tools in order to improve the TBM performance.  
 
Methodology and Approaches
In this paper, the effect of this replacement on the performance of the TBM is examined by statistical analysis of the field measurements. The value of operational parameters- thrust, torque, and penetration rate of the TBM- in different sections before and after the replacement is investigated.
 
Results and Conclusions
The statistical analysis shows that the mean value of both thrust and torque as well as their standard deviations after the replacement have considerably decreased in comparison with the figures for before the replacement, while the mean value of penetration rate has been approximately identical in both before and after the replacement of cutting tools. The results show that this replacement of disc cutters with ripper tools in alluvial conditions of Tehran has improved the performance of the TBM machine.

Keywords

Main Subjects

Full Text

عملیات حفاری توسط هر ماشین حفاری همواره اندرکنشی بین زمین و ماشین است و از این رو پارامترهای مهم در عملکرد و پیشروی TBM به طور کلی به دو دسته شرایط زمین و مشخصات ماشین حفر تقسیم می­شوند. شرایط زمین، شامل پارامترهای وابسته به مشخصات سنگ بکر و شرایط توده‌سنگ می‌باشد. ابزار برش TBM که روی کله ‌حفار آن نصب می­گردد به عنوان مهم‌ترین قسمت دستگاه که در تماس با توده سنگ سینه کار است در شرایط مختلف زمین‌شناسی رفتارهای متفاوتی از خود نشان می‌دهد که آشنایی با آن و مکانیزم حفر آن از اهمیت زیادی برخوردار است. ابزار برش برای انتقال انرژی تولید ‌شده توسط ماشین به سنگ استفاده می‌شود. به عنوان یک نتیجه، مشخصات هندسی و سایش دیسک (ابزار برش) اثر مهمی بر بازدهی انتقال انرژی به سنگ و رسیدن به نرخ نفوذ دست یافتنی دارد. ابزار­های خراشی یا ریپرها در ماشین­های اولیه حفاری سنگ به عنوان ابزار برش مورد استفاده قرار می­گرفتند. از آنجا که آنها شکل هندسی ساده­تری داشته، درک بهتری از مکانیزم برش سنگ فراهم شده و منجر به توسعه تئوری‌های برش سنگ شده­اند [1, 2]. در شکل 1 نمایی از چند نوع از این ابزار­ها نشان داده شده‌است.

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Journal of Analytical and Numerical Methods in Mining Engineering
Volume 10, Issue 24
November 2020
Pages 63-76

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History

  • Receive Date: 22 February 2020
  • Revise Date: 22 July 2020
  • Accept Date: 11 August 2020

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