Cut Out Distance – A Critical Parameter for Mechanized Depillaring by Continuous Miner | ||
| Journal of Mining and Environment | ||
| مقاله 5، دوره 16، شماره 5، مهر و آبان 2025، صفحه 1591-1605 اصل مقاله (9.53 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22044/jme.2025.15831.3045 | ||
| نویسندگان | ||
| Manthri Rakesh* ؛ Ashish Kumar Dash؛ Sunny Murmu | ||
| Department of Mining Engineering, National Institute of Technology Raipur, Raipur, India | ||
| چکیده | ||
| India's growing energy demand has intensified the need for efficient and safe coal extraction methods, particularly in underground mining, where mechanized depillaring using Continuous Miner (CM) technology has gained prominence. This study explores the critical role of Cut-Out Distance (COD) in optimizing production and ensuring safety during mechanized depillaring operations. COD, defined as the stable drivage length that can be cut without support, directly impacts productivity, roof stability, and operational safety. Despite its importance, there are no standardized guidelines for determining COD in Indian coal mines, leading to trial-and-error practices that compromise efficiency and safety. This paper reviews global and domestic practices, highlighting the inadequacies in existing methods for COD estimation. It identifies key factors influencing COD, including Rock Mass Rating (RMR), roof elasticity, geological conditions, and machinery capabilities. The work also examines case studies of strata control failures in Indian coal mines, highlighting the consequences of improper strata assessment in mines. The research work advocates for the development of standardized guidelines tailored to Indian mining conditions by integrating numerical simulations and machine learning tools for precise COD estimation. A flow chart of methodology for the development of guidelines is proposed; the findings aim to enhance safety, reduce accidents, and improve productivity, paving the way for sustainable growth in India's underground coal mining sector. | ||
| کلیدواژهها | ||
| Cut out distance؛ Mechanized Depillaring؛ Continuous Miner؛ Roof Stability؛ Strata behavior | ||
| مراجع | ||
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[1]. Roy, S., Mishra, D. P., Agrawal, H., & Bhattacharjee, R. M. (2025). Development of productivity model of continuous miner operators working in hazardous underground mine environmental conditions. Measurement, 239, 115516.
[2]. Kotaiah, D., Ravikiran, C., & Rakesh, M. (2023). Numerical modelling of underground coal pillar stability for developed and depillaring panels for a south Indian underground coal mine. Journal of Mines, Metals and Fuels, 71(6), 722–727.
[3]. Ministry of Coal. (2023–2024). Annual report 2023–24.
[4]. Gautam, A., Kumar, A., Ram, S., Skrzypkowski, K., Zagórski, K., Zagórska, A., Madziarz, M., & Migda, K. (2025). Strata control by roof blasting for bord and pillar mining method in mechanized depillaring panels. Applied Sciences, 15, 1403.
[5]. Singh, A. K., Ram, S., Kumar, A., Waclawik, P., & Kukutsch, R. (2025). Stability study of coal pillars due to induced stress-driven spalling during development and mechanised depillaring at different depths of cover. Canadian Geotechnical Journal, 62, 1–16.
[6]. Financial Express. (2019). Retrieved from https://www.financialexpress.com. (Accessed: February 25, 2025)
[7]. Kumar, A., Kumar, D., Singh, A. K., Ram, S., & Kumar, R. (2021). Development of an empirical model for strength estimation of irregular-shaped, heightened-rib/snook for mechanized depillaring. International Journal of Rock Mechanics and Mining Sciences, 148, 104969.
[8]. Rakesh, M., Dash, A. K., & Masood, M. (2025). Roof fall hazard and its mechanism: An overview. In A. K. Gorai, S. Ram, R. M. Bishwal, & S. Bhowmik (Eds.), Sustainable and innovative mining practices (ICSIMP 2023). Springer Proceedings in Earth and Environmental Sciences. Springer, Cham.
[9]. Coal Mines Regulations. (2017).
[10]. Gadepaka, P. R., Sonu, & Jaiswal, A. (2024). Assessment of the strength deterioration of a coal pillar using a strain-softening time-dependent constitutive model. Mechanics of Time-Dependent Materials, 28, 2841–2858
[11]. Kumar, A., Kumar, D., Ram, S., Singh, A. K., Kumar, R., Raja, M., & Singh, R. (2020). Rock mechanics challenges and advances in continuous miner-based mechanised depillaring of coal pillars. In Proceedings of National Conference on Advances in Mining (AIM-2020),32–46.
[12]. Singh, R., Kumar, A., Singh, A. K., Coggan, J., & Ram, S. (2016). Rib/snook design in mechanised depillaring of rectangular/square pillars. International Journal of Rock Mechanics and Mining Sciences, 84, 9–29.
[13]. Ram, S., Kumar, D., Singh, A. K., Kumar, A., & Singh, R. (2017). Field and numerical modelling studies for an efficient placement of roof bolts as breaker line support. International Journal of Rock Mechanics and Mining Sciences, 93, 152–162.
[14]. Kumar, A. (2020). Development of design norms for rib/snook during mechanised depillaring by continuous miner (Doctoral dissertation). IIT ISM Dhanbad.
[15]. Canbulat, I., & van der Merwe, J. N. (2000). Safe mining face advance and support installation practice in mechanical miner workings under different geotechnical conditions. SIMRAC Report, COL 609, 100–101.
[16]. Saharan, M. R., Palit, P. K., & Rao, K. R. (2010). Designing coal mine development galleries for room and pillar mining for continuous miner operations – Indian experience. In Proceedings of the 12th Coal Operators' Conference (pp. 54–162). University of Wollongong & The Australasian Institute of Mining and Metallurgy.
[17]. Bieniawski, Z. T. (1989). Engineering rock mass classifications. New York: Wiley.
[18]. Beinswaki, Z. T. (1976). Rock mass classifications in rock engineering. In Z. T. Beiniawski (Ed.), Exploration for rock engineering (pp. 97–106). Rotterdam: Balkema.
[19]. Molinda, G. M., & Mark, C. (1994). Coal mine roof rating (CMRR): A practical rock mass classification for coal mines (Vol. 9387). U.S. Department of Interior, Bureau of Mines.
[20]. Mark, C. (1999). Application of the Coal Mine Roof Rating (CMRR) to extended cuts. Mining Engineering, 51(4), 52–56.
[21]. Bauer, E. R. (1998). The impact of extended depth-of-cut mining on coal mine ground control and worker safety (Doctoral dissertation). The Pennsylvania State University.
[22]. Chen, Y., Bai, J., Yan, S., Hao, S., & Dao, V. D. (2016). A method for computing unsupported roof distance in roadway advancement and its in-situ application. International Journal of Mining Science and Technology, 26(4), 551–556.
[23]. Hardman, D. R., & Oberholzer, J. W. (1987). The performance of continuous miners in South African collieries. Journal of the South African Institute of Mining and Metallurgy, 87, 7–13.
[24]. Mandal, P. K., Das, A. J., Kumar, N., Bhattacharjee, R., Tewari, S., & Kushwaha, A. (2018). Assessment of roof convergence during driving roadways in underground coal mines by continuous miner. International Journal of Rock Mechanics and Mining Sciences, 108, 169–178.
[25]. Canbulat, I., & Jack, B. W. (1998). Review of current design methodologies to improve the safety of roof support systems, particularly in the face area in collieries. SIMRAC Final Project Report, COL 328, 212.
[26]. Vinay, L. S. (2023). Study of strata behaviour for stability of continuous miner panels using numerical simulation and machine learning techniques (Doctoral dissertation). IIT ISM Dhanbad.
[27]. Wu, W. D., Bai, J. B., Feng, G. R., & Wang, X. Y. (2021). Investigation of the mechanism and control methods for roof collapse caused by cable bolt shear rupture. Journal of Engineering Failure Analysis, 130, 105802.
[28]. Ghasemi, E., Ataei, M., Shahryar, K., Sereshki, F., Jalali, S. E., & Ramazanzadeh, A. (2012). Assessment of roof fall risk during retreat mining in room and pillar coal mines. International Journal of Rock Mechanics and Mining Sciences, 54, 80–89.
[29]. Rakesh, M., & Dash, A. K. (2023). Strata behaviour during different stages of mechanized depillaring operations: An Indian case study. In Proceedings of Second International Conference on Emerging Trends in Engineering (ICETE 2023), Advances in Engineering Research, 223, 1265–1276.
[30]. DGMS. (2024). Directorate General of Mines Safety, Standard Note 2024. Dhanbad, India. | ||
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