Comparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود

2 دانشکده مهندسی معدن و متالورژی، دانشگاه یزد

10.29252/anm.8.17.27

چکیده

Selecting a suitable pillar recovery method is one of the most important issues in the room and pillar mining. The main purpose of this study is to compare two methods for pillar recovery in Tabas central coal mine (TCM). Among the existing methods, the two methods, “Modified split and fender” and “Shortwall” are chosen for the numerical modeling. The three dimensional finite difference method (FLAC3D software) is used to model these methods. In the next step, the vertical stress and displacement, the plastic zone condition and the safety factor during each stage of pillar recovery were compared for each method. The results of this modeling show that the percentages of coal recovery for two methods of “modified split and fender” and “shortwall” are around 70% and 82% respectively. Comparing the percentage recovery of coal for these two methods, exhibits that the shortwall method is more suitable than modified split and fender, for this mine.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran

نویسندگان [English]

  • Mohammad Yaghoobi 1
  • Ramin Rafiee 1
  • Mehdi Najafi 2
1 Dept. of Mining, Petroleum and Geophysics, Shahrood University, Iran,
2 Dept. of Mining and Metallurgy, Yazd University, Iran
چکیده [English]

Selecting a suitable pillar recovery method is one of the most important issues in the room and pillar mining. The main purpose of this study is to compare two methods for pillar recovery in Tabas central coal mine (TCM). Among the existing methods, the two methods, “Modified split and fender” and “Shortwall” are chosen for the numerical modeling. The three dimensional finite difference method (FLAC3D software) is used to model these methods. In the next step, the vertical stress and displacement, the plastic zone condition and the safety factor during each stage of pillar recovery were compared for each method. The results of this modeling show that the percentages of coal recovery for two methods of “modified split and fender” and “shortwall” are around 70% and 82% respectively. Comparing the percentage recovery of coal for these two methods, exhibits that the shortwall method is more suitable than modified split and fender, for this mine.

کلیدواژه‌ها [English]

  • Room and pillar
  • Pillar recovery
  • Coal mine
  • Modified split and fender
  • Shortwall mining
  • FLAC3D software

مراجع

[1]          Hustrulid, W. A., Bullock. R.L., (2001). Underground mining methods: Engineering fundamentals and international case studies. SME.
[2]          Kauffman, P. W., Hawkins, S. A., and Thompson, R. R., 1981, Room and Pillar Retreat.
[3]          Farmer I. 1992, Room and Pillar mining, in: SME Mining Engineering Handbook, Second edition, ed. By Hartman H. L., Society for Mining, Metallurgy, and Exploration, Inc., SME/AIME, Co, Sec. 18.1, pp. 1681-1701.
[4]          Mark, C., Chase, F., & Pappas, D. (2003). Reducing the risk of ground falls during pillar recovery. Transactions-Society for Mining Metallurgy and Exploration Incorporated, 314, 153-160.
[5]          Kushwaha, A., Banerjee, G., 2005, Exploration of developed coal mine pillars by shortwall mining-a case example, International Journal of Rock Mechanics & Mining Sciences 42, pp 127-136.
[6]          Qiyami, R., 2009, designed pillar recovery in the room and pillar extraction, Master's thesis, Tehran University , School of Mining Engineering (In Persian).
[7]          Singh, A. K., Singh, R., Maiti, J., Kumar, R., & Mandal, P. K. (2011). Assessment of mining induced stress development over coal pillars during depillaring. International Journal of Rock Mechanics and Mining Sciences, 48(5), 805-818.
[8]          Ghasemi E, Shahriar K, 2012, a new coal pillars method in order to enhance safety of the retreat mining in room and pillar mine, safety science 48, 1304-1312.
[9]          Najafi, M., Jalali, S.E., Yarahmadi, A.R., Sereshki, F., 2011, Prediction of the Confidence Interval for Stability Analysis of Chain Pillars in Coal Mines, Journal of Safety Science, Vol. 49, Issue 5, pp 651-657.
[10]        Anon, 2005. Basic Design of Tabas Coal Mine Project, Report-Mining. Vol 1 of 5.
[11]        ADAM Consulting engineering, 2005, Central Mine Design Report for NISCO, National Iranian Steel Co.
[12]        Mortazavi, A., Hassani, F. P., & Shabani, M. (2009). A numerical investigation of rock pillar failure mechanism in underground openings. Computers and Geotechnics, 36(5), 691-697.
[13]        Campoli, Alan A., David C. Oyler, and Frank E. 1989, Chase. Performance of a novel bump control pillar extracting technique during room-and-pillar retreat coal mining. US Department of the Interior, Bureau of Mines.
[14]        Liu, G., Li, L., Yang, X., and Guo, L. (2016). Numerical analysis of stress distribution in backfilled stopes considering interfaces between the backfill and rock walls. Int. J. Geomech.
[15]        Najafi, M., Shishebori, A., & Gholamnejad, J. (2016). Numerical estimation of suitable distance between two adjacent panels’ working faces in shortwall mining. International Journal of Geomechanics, 17(4), 04016090.
روش های تحلیلی و عددی در مهندسی معدن
دوره 8، شماره 17
اسفند 1397
صفحه 27-37

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سابقه مقاله

  • تاریخ دریافت: 30 آبان 1395
  • تاریخ بازنگری: 15 فروردین 1396
  • تاریخ پذیرش: 27 تیر 1396

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