An optimization approach for panel dimension design in underground coal mines


  • Tahir Mallı Dokuz Eylül University
  • Mustafa E. Yetkin Dokuz Eylül University


Coal production, longwall, panel optimization, panel length, face length.


Global energy demand increases the coal production in the last decades. Productive and cost-effective production and work safety are important factors in terms of underground coal mine design and planning. Generally, coal production is provided by longwall method to maximize production extracting large panel blocks in underground. Longwall method is designed by some technical parameters and constraints such as panel dimension, face and panel length.

This study deals with determination of the optimum face length, panel length and their relations in mining planning. In this study, the ratio of panel length to face length (PL/FL) is derived in underground coal mining planning. If this rate lower, mining loss are also decreasing. In the proper panel dimension selection, the optimum zone is suggested to keep mining losses in optimum limits. This zone provides panel dimension planning within more efficient and safe place for longwall coal operations. Usually, PL/FL rate is lower in this zone. Therefore, the low rates of PL/FL will reduce coal mining losses. With reducing mining losses, the increased productivity will also provide to reduction of fixed cost. With this approach, it is foreseen that designing of coal panel can be realized for more efficient production. 

Author Biographies

Tahir Mallı, Dokuz Eylül University

Mining Engineering Department

Mustafa E. Yetkin, Dokuz Eylül University

Mining Engineering Department


Álvarez-Fernández M, González-Nicieza C, Argüelles A (2011) Determination of the stress state in a rock mass subjected to excavation. Bull Eng Geol Environ. 70: 243.

Badr SA (2004) Numerical analysis of coal yield pillars at deep longwall mine. Ph.D. thesis, Colorado School of Mines, Golden, CO.

Bai Q Tu S, Zhang X, Zhang C, Yuan Y (2014) Numerical modeling on brittle failure of coal wall in longwall face—a case study. Arab J Geosci. 7(12):5067–5080.

Bertuzzi R, Douglas K, Mostyn G (2016) An Approach to model the strength of coal pillars, International Journal of Rock Mechanics & Mining Sciences 89, pp.165–175.

Bilim N (2007) Investigation of Performances Of Excavation Machines in Çayırhan Underground Coal Mine and Relations with Rock Properties. PhD Thesis. Graduate School of Natural and Applied Sciences. Selçuk University (in Turkish).

Destanoglu N, Taskin FB, Tastepe M, Ogretmen S (2000) Omerler mechanized longwall application, Turkish Coal Administration, Ankara (in Turkish).

Esterhuizen E, Mark C, Murphy MM (2010) Numerical model calibration for simulating coal pillars, gob and overburden response. In: Proceeding of the 29th International Conference on Ground Control in Mining. Morgantown, West Virginia.

Falaknaz N, Aubertin M, Li L (2015) Numerical analyses of the stress state in two neighboring stopes excavated and backfilled in sequence. Int. J. Geomech., 10.1061/(ASCE)GM.1943-5622.0000466, 04015005.

Hutchinson DJ, Phillips C, Cascante G (2002) Risk considerations for crown pillar stability assessment for mine closure planning. Geotech. Geol. Eng, 20 (1), 41–64.

IEA,2016. International Energy Agency. Energy policies of IEA countries, Turkey 2016 review.

Karacan CO, Diamond WP, Esterhuizen GS, Schatzel SJ (2005) Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes National Institute for Occupational Safety and Health (NIOSH), Pittsburgh Research Laboratory.

Köse H, Cebi Y (1988) The determination of stres distribution which forms during Longwall mining operations of thick coal seams. The sixth coal congress of Turkey pp371-383 Zonguldak.

Li L (2014) Generalized solution for mining backfill design.” Int. J. Geomech., 10.1061/(ASCE)GM.1943-5622.0000329, 04014006.

Magda R (1994) Mathematical model for estimating the economic effectiveness of production process in coal panels and an example of its practical application. International Journal of Production Economics, 34.

Magda R (2012) Selected Aspects of Theory of Mine Planning. Journal of Mining and Geoengineering, vol. 36, No. 3. pp:233-242.

Mallı T (2013) Determination of Open Pit-Underground Mine Limit by Using Investment Theories, Ph.D. Thesis, Dokuz Eylul University, Institıte of Natural & Applied Sciences, Izmir.

Mark L, Whyatt J (2009) Deep Coal Longwall Panel Design for Strong Strata: The Influence of Software Choice on Results Proceedings of the International Workshop on Numerical Modeling for Underground Mine Excavation Design. Pittsburgh.

Mishra DP, Sugla M, Sinha P (2013) Productivity improvement in underground coal mines-A case study. Journal of Sustainable Mining, Vol. 12, No. 3, pp. 48–53.

Najafi M, Shishebori A, Gholamnejad J (2017) Numerical Estimation of Suitable Distance between Two Adjacent Panels’ Working Faces in Shortwall Mining. Int. J. Geomech, 17 (4): -1-1.

Özfırat MK (2007) Investigations on determining and decreasing the coal loss at fully-mechanized production in Omerler underground coal mine. PhD Thesis. Graduate School of Natural and Applied Sciences. Dokuz Eylül University (in Turkish).

Palchik V (2003) Formation of Fractured Zones in Overburden due to Longwall Mining. Environmental Geology, Vol. 44, pp.28-38.

Phase2 8 Version 8.020-2014, Rocscience Inc, Toronto, Ontario, Canada.

RS3 Version 1.018-2016, Rocscience Inc, Toronto, Ontario, Canada.

RocData 5.0. Rock, Soil and Discontinuity Strength Analysis, Version 5.0. 2014.

Shabanimashcool M, Li CC (2012) Numerical modelling of longwall mining and stability analysis of the gates in a coal mine. Int J Rock Mech Min Sci. 51:24–34.

Shabanimashcool M, Li CC (2013) A numerical study of stress changes in barrier pillars and a border area in a longwall coal mine.” Int. J. Coal Geol. 106, 39–47.

Simsir F (1995) Determination of optimum face length at Çayırhan lignite colliery. 14th Mining Congress in Turkey.

Singh AK, Singh R, Maiti J, Kumar R, Mandal PK (2011) Assessment of mining induced stress development over coal pillars during depillaring. Int. J. Rock Mech. Min. Sci., 48(5), 805–818.

Stocks S, Sroka A (2000) Design of longwall panels for mining damage reduction. In: Proceedings of the 11th International Congress of the ISM, Kraków. p. 183e90 (in German).

Suchowerska AM, Merifield RS, Carter JP (2013) Vertical stress changes in multi-seam mining under supercritical longwall panels. Int. J. Rock Mech. Min. Sci., 61(July), 306–320.

Varlıbaş Y (2014) The Investigation of Boom Type Roadheader Excavating Performances Used in Çayırhan Underground Coal Mining of Field E Considering Physical and Mechanical Properties of Geological Units. Master Thesis. Dumlupınar University (in Turkish).

Verma AK, Deb D (2013) Numerical analysis of an interaction between hydraulic powered support and surrounding rock strata, American Society of Civil Engineers.

Whittaker BN, Singh RN (1979) Design and Stability of Pillars in Longwall Mining. Mining Engineer, Vol.139, No:214, pp. 59-73.

Yasitli NE, Unver B (2005) 3-D numerical modelling of stresses around a longwall panel with top coal caving The Journal of The South African Institute of Mining and Metallurgy Volume 105, pp. 287-300.

Yang G, Zhang Cun, Yan R, Jia S (2016) Optimum Size of Coal Pillar Dimensions Serving Mechanised Caving Longwall Face in a Thck Seam. Proceedings of the 16th Coal Operators' Conference, Mining Engineering, University of Wollongong, pp: 190-195.

Yin GZ, Li XS, Guo WB (2010) Photo-elastic experimental and field measurement study of ground pressure of surrounding rock of large dip angle working coalface. Chinese J Rock Mech Eng. 29(S1):3336–43.

Zheng X, Yao Z, Zhang N (2012) Stress distribution of coal pillar with gob-side entry driving in the process of excavation & mining, Journal of Mining & Safety Engineering, 29(04): 459-465 (in Chinese).






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