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International Journal of Science, Strategic Management and Technology

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GEOTECHNICAL CHALLENGES AND FAILURE MECHANISMS IN INDIAN UNDERGROUND COAL MINES: ROOF STABILITY, PILLAR DESIGN AND FLOOR BEHAVIOUR UNDER COMPLEX GEOLOGICAL CONDITIONS

AUTHORS:
Ashvin Gupta
Mentor
Ram Chandra Chaurasia
Affiliation
Department of Mining and Mineral Processing, Lakshmi Narain College of Technology, Jabalpur, Madhya Pradesh, 482053, India.
CC BY 4.0 License:
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Underground coal mining in India is constrained by complex Gondwana geology, variable rock-mass quality, increasing extraction depths, and heterogeneous stress conditions. Weak laminated shale, jointed sandstone, high horizontal stresses, pillar degradation, floor instability, and mining-induced deformation frequently interact during underground extraction. This paper synthesizes the geotechnical evidence presented in the source report, focusing on roof and rib stability, pillar behaviour, floor response, stress redistribution, and associated failure mechanisms. Major Indian coalfields including Jharia, Raniganj, Singrauli, Talcher, Wardha Valley, and Godavari Valley are considered within the broader geological framework. Representative coal-measure rocks commonly exhibit fair-to-poor rock-mass quality, with RMR values generally ranging from 35 to 60. The reported high horizontal-to-vertical stress ratio of 1.5–3.0 at greater depths changes the dominant failure response from gravity-controlled instability toward stress-driven deformation. Field observations indicate roof convergence of 0.5–5 mm/day during development, increasing during depillaring. Numerical analyses demonstrate substantial reductions in roof sag and plastic-zone development following systematic reinforcement. Case studies from Jharia and Singrauli illustrate how delamination, wedge failure, rib spalling, interface shearing, moisture weakening, and abutment loading can combine into progressive instability. The synthesis indicates that site-specific characterization, calibrated numerical modelling, appropriate pillar dimensions, reinforcement, extraction sequencing, and continuous monitoring are necessary for reliable ground control under Indian conditions.

 

 
Keywords
Indian coalfields; roof stability; pillar design; floor heave; stress redistribution; rib spalling; rock mass classification; underground mining
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Gupta, A. (2026). Geotechnical Challenges and Failure Mechanisms in Indian Underground Coal Mines: Roof Stability, Pillar Design and Floor Behaviour under Complex Geological Conditions. International Journal of Science, Strategic Management and Technology, 02(8), 1-9. https://doi.org/10.55041/ijsmt.v2i8.094

Gupta, Ashvin. "Geotechnical Challenges and Failure Mechanisms in Indian Underground Coal Mines: Roof Stability, Pillar Design and Floor Behaviour under Complex Geological Conditions." International Journal of Science, Strategic Management and Technology, vol. 02, no. 8, 2026, pp. 1-9. doi:https://doi.org/10.55041/ijsmt.v2i8.094.

Gupta, Ashvin. "Geotechnical Challenges and Failure Mechanisms in Indian Underground Coal Mines: Roof Stability, Pillar Design and Floor Behaviour under Complex Geological Conditions." International Journal of Science, Strategic Management and Technology 02, no. 8 (2026): 1-9. https://doi.org/https://doi.org/10.55041/ijsmt.v2i8.094.

References
Bieniawski, Z.T. (1976, 1989). Rock mass classification principles cited within the source methodology.

Das, A.J. and Mandal, P.K. (2018) ‘Strategies for underground extraction of inclined coal seams by continuous miner’. CSIR-CIMFR.

Gorain, S. et al. (2025) ‘Preventing and Mitigating Side Spalling in Bord and Pillar Mining Methods: A Comparative Study’.

Kumar, A. et al. (2018) ‘Influence of Overlying Roof Strata on Rib Design in Mechanised Depillaring’, Journal of the Geological Society of India, 91(3), pp. 341–347.

Kumar, A. et al. (2020) ‘Developments Made for Mechanised Extraction of Locked-Up Coal Pillars in Indian Geomining Conditions’. IntechOpen.

Kumar, R. et al. (2022) ‘Importance of Fracturing Hard and Massive Overlying Strata for Complete Extraction of Thick Coal Seam – Case Studies’, Journal of the Geological Society of India, 98(2), pp. 203–210.

Pathak, C.P. et al. (2023) ‘Strata Control in Mining: A Study of Strata Control in an UG Coal Mine’, Journal of Thermal and Fluid Science, 4(2), pp. 60–63.

Prasad, S., Sinha, R.K. and Rambabu, B. (2022) ‘Numerical Modelling Approach for Assessment of Factor of Safety of Ribs in Continuous Miner Depillaring Panels’, Journal of Mines Metals and Fuels, pp. 379–388.

Ram, S.W. et al. (2015) ‘Rock Mechanics Studies During Continuous Miner Based Coal Pillar Extraction in Indian Coalfields’.

Rakesh, M. and Dash, A.K. (2025) ‘Strata Control Challenges and Monitoring Strategies in Indian Coal Mining under Complex Geotechnical Conditions’, Journal of Mines Metals and Fuels, pp. 2197–2206.

Samanta, S. et al. (2022) ‘Deployment of Continuous Miner in Underground Coal Mine: A Case Study of Sarpi Mine’, Journal of The Institution of Engineers (India): Series D, 103(2), pp. 453–471.

Singh, A.K. et al. (2021) ‘Field and Simulation Studies for Mechanised Depillaring below Incompetent Geological Formations of an Indian Coal Mine’, Journal of the Geological Society of India, 97(4), pp. 405–415.
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This article has undergone plagiarism screening and double-blind peer review. Editorial policies have been followed. Authors retain copyright under CC BY-NC 4.0 license. The research complies with ethical standards and institutional guidelines.
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