Numerical analysis of disc cutter forces in linear rock cutting procedure using finite element method

Document Type : Research Article

Authors

1 Dept. of Mining, Zanjan University, Iran

2 Dept. of Engineering, Tarbiat Modares University, Tehran, Iran

10.29252/anm.2019.8036.1275

Abstract

Summary
One of the most important results of the linear rock cutting process is the accurate estimation of the cutting forces applied to the disc cutter which can be a prelude to the development of models for predicting the performance of all tunnel boring machines (TBM). In this study, numerical modeling of rock cutting process by a disc cutter using finite element code ABAQUS has been implemented. For model validation, the results of the linear cutting machine tests (LCM) by Previous researchers have been applied. After solving the proposed model, the forces on the disc were calculated in three directions of the rock cutting model and the mean of each force was calculated by a code that was developed in MATLAB software. Comparison of laboratory results and numerical modeling shows 11.1% error for the mean normal force, 5.6% error for the average rolling force, and 10% error for the average lateral force. By comparing the results of numerical modeling and linear cutting experiments, we can conclude that there is a good agreement between them.
 
Introduction
In this study, a numerical model of linear rock cutting process based on finite element method (commercial code  ABAQUS) was used. To validate the proposed model, Rostami's (1997) linear rock cutting test on the Indiana limestone sample was used. Due to the unavailability of this rock sample, data from other texts were used to obtain input parameters to the model. A model assembly with a single disc cutter similar to laboratory test was simulated. By solving the proposed model, the forces applied to the cutter were calculated.
 
Methodology and Approaches
In order to model linear rock cutting procedures, Commercial finite element code ABAQUS/CAE was employed and for validating that, laboratory linear rock cutting test by Rostami (1997) was considered. Rock and disc cutter models was built in ABAQUS GUI module and to simulate rock behavior of rock model, a linear strength criterion was implemented in the model. Boundary Condition for disc cutter was similar to TBM’s working status with linear velocity of 2 meter per seconds and angular velocity of 9.3 radians per seconds.
 
Results and Conclusions
Modeling shear forces showed a similar trend to the experimental results. On the other hand, the comparison of the cutting forces of the experimental test with the numerical model results showed 11.1, 5.6 and 10% differences for the normal, rolling and lateral forces, respectively. This discrepancy seems to be due to the complexity and nonlinearity of the rock-cutting problem and the impossibility of considering all the parameters governing to rock-cutting process with a natural disc cutter. However, further analysis is being done by modeling on other rock samples to confirm the results.

Keywords

Main Subjects

Full Text

حفاری مکانیزه و یا حفر مکانیکی به هر روشی‌ اتلاق می‌شود که در آن از یک ابزار مکانیکی برای جدا کردن سنگ یا خاک از موقعیت آن استفاده می‌شود. امروزه حفاری مکانیکی، جنبه رایجی از ساخت‌وسازهای زیرزمینی از جمله احداث تونل‌ها، چاه‌ها و استخراج مکانیزه منابع زیرزمینی را در برگرفته است.

از مهم‌ترین مسائل موجود برای کاربرد موفقیت‌آمیز ماشین­های حفر مکانیزه، بهینه­سازی طراحی و برآورد دقیق عملکرد آنها بوده است. بهینه­سازی طراحی به معنای رعایت ملزومات مورد مطالعه ماشین برای مواجهه با شرایط پیچیده زمین و طراحی اجزاء آن (مثل کله حفاری) به ‌منظور کسب عملکرد بهینه است که در نهایت نرخ تولید قابل‌دستیابی را ممکن می­سازد، به نحوی ‌که هزینه و اقتصاد پروژه را نیز در نظر می­گیرد. علی­رغم توانایی‌های موجود برای برآورد دقیق­تر عملکرد این ماشین‌ها، کماکان نیازمند بهبودهایی خواهد بود.

محققان زیادی بر روی مسئله برش سنگ با تیغه دیسکی طی چهار دهه اخیر پژوهش کردند. تمرکز پژوهش از فرو روی[i]یک برش­دهنده دیسکی در سنگ برای برآورد شکنندگی سنگ تا برآورد نیروهای برش در فرآیند برش سنگ با خصوصیات مشخص مکانیکی بوده است. اخیراً پیشرفت­هایی در زمینه شبیه­سازی فرآیند برش سنگ با مدل­های عددی مانند روش المان محدودو روش المان مجزا انجام‌گرفته است[1]. کاربرد روش­های عددی بر اساس محیط پیوسته برای حل این مسئله موفقیت قابل‌توجهی را کسب نکرده است، چرا که از هم پاشیدگی قطعات سنگی در این روش، زیر سؤال می‌رود. این ضعف با پیشرفت­هایی که اخیراً در روش المان محدود حاصل‌شده است، جبران شده است به ‌نحوی‌که قابلیت شبیه‌سازی شکست در سنگ از طریق حذف المان‌هایی که به آستانه شکست کششی خود می‌رسد، انجام می­پذیرد[2].


[i] Identation

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Journal of Analytical and Numerical Methods in Mining Engineering
Volume 9, Issue 20
October 2019
Pages 53-66

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History

  • Receive Date: 10 August 2017
  • Revise Date: 27 September 2019
  • Accept Date: 28 September 2019

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