Advertisement

Development of a model to estimate strata behavior during bord and pillar extraction in underground coal mining

  • Satyabadi Kumar Jena
  • Ritesh Dharmraj LokhandeEmail author
  • Manoj Pradhan
  • Nirmal Kumar
Review Paper
  • 47 Downloads

Abstract

Instrumentation and monitoring is undertaken aiming at evaluation of changing values of rock mechanic parameters, namely, dilation, load, convergence, and stress, during mining for a safe strata control. It enables the mining practitioners to anticipate roof fall–related dangers in advance and taking subsequent preventive measures while depillaring. The coal measure formations consist of relatively weaker stratified rock masses. Bed separation occurs in the overlying strata due to induced mining stresses, which cause the rock mass in its surrounding to displace. These occurrences can be monitored by installing geotechnical instruments at judicious locations to avoid occurrence of any dangerous condition due to roof fall. Improper anticipation of strata movement during extraction in coal mining is one of the principal causes of accidents due to roof and side collapses. Also, the installed instruments can help in prediction of any apprehensive condition during depillaring. Preventive measure can be taken if the strata movement is monitored and roof fall is predicted in advance. The study is aimed to develop a conceptual model roof fall warning index, based on critical strata movement during underground coal extractions. Numbers of mining aspects, such as analysis of instruments’ reading, geo-mining parameters, physico-mechanical properties roof formations, and induced stress, are taken into considerations for development of the model. This study is mainly focused to predict a critical strata movement value for safety of the bord and pillar method of mining, perticularly depillaring.

Keywords

Underground coal mining Dilation Convergence Ultimate induced stress and caving 

Notes

Acknowledgments

The obligation is expressed to the SECL management for granting permission for the study/research work including publication, vide Ref. SECL/BSP/2015/Study Perm./2719, dated August 05, 2015. The views expressed in this paper are those of the authors and not necessarily of the organizations they represent.

References

  1. Alber M, Fritschen R, Bishoff M (2013) Strength constraints of shallow crustal strata from analysis of mining-induced seismicity. Solid Earth Discuss, Germany 5:737–765CrossRefGoogle Scholar
  2. Anon (2015) Cause wise analysis of disasters in Indian coal mines since the year 1901. DGMS Strateg Plan:2011–2015Google Scholar
  3. Heasley KA (1998) Numerical modelling of coal mines with a laminated displacement, discontinuity code. Ph.D. thesis. In: Colorado School of Mines. Golden, USAGoogle Scholar
  4. Hebblewhite BK, Galvin JM, Vasundhara (1999) Barrier and chain pillar design research outcomes. Angus Place Colliery, Aust Geomech:69-76Google Scholar
  5. Itasca (2003) FLAC3D (Fast Lagrangian Analysis of Continua in 3 Dimensions), Itasca Consulting Group Inc., Version 3.0, Minneapolis, Minnesota, 55,401, USAGoogle Scholar
  6. Jaiswal A, Srivastava BK (2009) Numerical simulation of coal pillar strength. Int J Rock Mech Min Sci 46:779–778CrossRefGoogle Scholar
  7. Jaiswal A, Sharma SK, Srivastava BK (2004) Numerical modeling study of asymmetry in the induced stresses over coal mine pillars with advancement of the goaf line. Int J Rock Mech Min Sci 41:859–864CrossRefGoogle Scholar
  8. Jayanthu S, Singh TN, Singh DP (2004) Stress Distribution During Extraction of Pillars in a Thick Coal Seam. Rock Mech Rock Eng 37(3):171–192Google Scholar
  9. Jena SK, Singh RS, Mandal TK, Singh R, Mandal PK, Singh AK, Kumar R, Ram S, Singh Amit K (2007) Interaction of ground movement with underground mining of thick and contiguous sections below hilly terrain, a case study. Minetech Journal India 28(2&3):33–44Google Scholar
  10. Jena SK, Lokhande RD, Pradhan M, Kumar N (2018) Analysis of strata behavior during final extractions in underground coal mining under difficult caving characteristic of roof condition. J Mines Met Fuels 66 ISSN 0022-2755, India:770-779Google Scholar
  11. Kumar N, Jena SK (2011) Strata Control Monitoring-an approach for stabilization of underground geometry, Ref underground mining at SECL. The Indian Min Eng J 50:33–35Google Scholar
  12. Kushwaha A, Singh SK, Tewari S, Sinha A (2010) Empirical approach for designing of support system in mechanized coal pillar mining. Int J Rock Mech Min Sci 47(7):1063–1078CrossRefGoogle Scholar
  13. Lawrence WA (2009) A method for the design of longwall gate road roof support. Int J Rock Mech Min Sci 46:789–795CrossRefGoogle Scholar
  14. Lokhande RD, Murthy VMSR, Venkateswarlu V (2015) Assessment of pot-hole subsidence risk for Indian coal mines. Int J Min Sci Technol 25:185–192CrossRefGoogle Scholar
  15. Mandal PK, Singh R, Maiti J, Singh AK, Kumar R, Sinha A (2008) Underpinning-based simultaneous extraction of contiguous sections of a thick coal seam under weak and laminated parting. Int J Rock Mech Min Sci 45:11–28CrossRefGoogle Scholar
  16. Nemcik J, Gale WJ, Fabjanczyk M (2006) Methods of interpreting ground stress based on underground stress measurement and numerical modeling. Coal Operator’s Conference, University of Wollongong & the Australian Institute of Mining and Metallurgy:104-112Google Scholar
  17. Poulsen BA (2010) Coal pillar load calculation by pressure arch theory and near field extraction ratio. Int J Rock Mech Min Sci 47:1158–1165CrossRefGoogle Scholar
  18. Salamon MDG (1964) Elastic analysis of displacements and stress induced by the mining of seam or reef deposits. Part II. J S Afr. Inst Min Metal 64(6):197–218Google Scholar
  19. Senfaute G, Al HM, Josien JP, Noirel JF (2014) Detection and monitoring of high stress concentration zones induced by coal mining using numerical and micro-seismic method. HAL, FranceGoogle Scholar
  20. Sheorey PR, Murli Moihan G, Sinha A (2001) Influence of elastic constants on the horizontal in situ stress. Int J Rock Mech Min Sci 38:1211–1215CrossRefGoogle Scholar
  21. Singh R, Singh AK, Singh MK, Sinha A (2004) Instrumentation and monitoring of strata movement during underground mining of coal. Minetech Journal India 25(5):12–26Google Scholar
  22. Singh GSP, Singh UK, Murthy VMSR (2010) Application of numerical modelling for strata control in mines. Springer, Geotech Geol Eng 28:513–524CrossRefGoogle Scholar
  23. Singh AK, Singh R, Maity J, Kumar R, Mandal PK (2011) Assessment of mining-induced stress development over coal pillars during depillaring. Int J Rock Mech Min Sci 48:805–818CrossRefGoogle Scholar
  24. Unver B, Yasitli NE (2006) Modelling of strata movement with a special reference to caving mechanism in thick seam coal mining. Int J Coal Geol 66:227–252CrossRefGoogle Scholar
  25. Wang T, Fan Q (2000) Optimisation of soft rock engineering with particular reference to coal mining. Int J Rock Mech Min Sci 37:535–542CrossRefGoogle Scholar
  26. Wang C, Wang Y, Lu S (2000) Deformational behavior of roadway in soft rocks in underground coal mines and principles of stability control. Int J Rock Mech Min Sci 37:937–946CrossRefGoogle Scholar
  27. WANG J-x, LIN M–y, TIAN D-x, ZHAO C-l (2009) Deformation characteristics of a surrounding rock of broken and soft rock roadway. Min Sci Technol 19:0205–0209Google Scholar
  28. Yerpude RR, Walke DV (2014) Investigation into the risk factors associated with roof falls in underground coal mine. Int J Eng Res Technol (IJERT) 3:1249–1257Google Scholar
  29. Zhao C, Hebblewhite BK (2000) Analytical solutions for mining-induced horizontal stress in floors of coal mining panels. Elsevier, Comput. Methods Appl Mech Engrg 184:125–142CrossRefGoogle Scholar

Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.National Institute of Technology RaipurRaipurIndia
  2. 2.Visvesvaraya National Institute of TechnologyNagpurIndia
  3. 3.South Eastern Coalfields LimitedBilaspurIndia

Personalised recommendations