Abstract
The underachievement of support systems in roof bolts layout design is one of the dominant causative factors of roof fall in underground mines. Various factors triggering the roof failure are the presence of laminated roof, the geological plane of weaknesses, the time lag in support installation, inefficient grouting/bonding of roof bolts, improper estimation of roof bolt length, the concentration of the induced stresses due to mining activities, etc. The roof fall concerns mining engineers as it seriously affects safety and productivity. Hence the stability of the openings has to be considered as a priority to suspend the movement of overlying layered strata by application of adequate support. Application of rock mass classification system helps in guiding suitable roof support design for apt stabilization of the mine openings. The study has been carried out to assess the befitting support design of various openings in underground chromite mine considering applicable rock mass classification systems namely Bieniawski’s Geomechanical System and Barton’s Q — system inclusive of numerical analysis. The values of rock load obtained by Bieniawski’s geomechanical system was on the higher side. Thus, in view of the safety and stability of engineering structures, Bieniawski’s geomechanical system was considered for the design of a support system. Rock load was determined for different dimensions of underground openings such as decline, cross-cut junctions, cross-cut roadways, ore drive, footwall drive, and haulage junctions, wherein width variation resulted in influencing rock load. Safety factor has also been analysed with respect to the width of the opening to demarcate stable and semi-stable zones.
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References
Barton, N.R., Lien, R., Lunde, J. (1974) Engineering classification of jointed rock mass for the design of tunnel support. Rock Mech., v.6(4), pp.189–239.
Bieniawski, Z.T. (1973) Engineering classification of jointed rock mass. Trans. South African Civil Engrs., v.15, pp.335–344.
Bieniawski, Z.T. (1976) Rock mass classification in rock engineering. In: Bieniawski, Z.T., (Ed.), Exploration for Rock Engineering. Proc. Symp. Cape Town, Balkema, 1, pp.97–106.
Cai, M. (2019) Rock support in strain burst prone ground. Internat. Jour. Min. Sci. Tech., v.29(4), pp.529–354.
Carter, T.G. (1992) Prediction and uncertainties in geological engineering and rock mass characterization assessments. Proc. 4th Int. Rock Mech. Rock Engineering Trino., Paper 1.
Frith, R., Reed, G. (2017) Coal pillar design when considered as reinforcement problem rather than suspension problem. Internat. Jour. Min. Sci. Tech., v.28(1), pp.11–9.
Ghose, A.K., Raju N.M. (1981) Characterization of rock mass vis-à-vis application of rock bolting — modelling on Indian coal measures. Proc. U.S Symp Rock Mech, 22nd (Massachusetts Inst. Technol), pp.422–427.
Ghosh, C.N., Ghose, A.K. (1992) Estimation of critical convergence and rock load in coal mine roadways — an approach based on rock mass rating. Geotech. Geol. Eng., v.10, pp.185–202.
Hudson, J.A. and Harrison, John. P. (1997) Engineering rock mechanics, an introduction to principles. Pergamon, An imprint of Elsevier Science Amsterdam — Lausanne — New York — Oxford — Shannon — Singapore — Tokyo, pp.314–315.
Kumar, R., Mishra, A.K., Singh, A.K., Ram, S., Singh, R. (2016) Depillaring of total thickness of thick coal seam in single lift using cable bolts: A case study. Internat. Jour. Min. Sci. Tech., v.26(2), pp.223–233.
Laubscher, D.H. (1984) Design aspects and effectiveness of support systems in different mining conditions. Trans. Inst. Min. Metal., v.1, pp.70–81.
Laubscher, D.H. (1993) Planning mass mining operations. In: Hudson, J.A., (Ed.), Comprehensive Rock Engineering. Oxford, UK, Pergamon Press, 2, pp.547–583.
Meek, J. L. (1993) Stress Analysis in Mine Design. In: Hudson, J.A., (Ed.), Comprehensive Rock Engineering. Pergamon Press Oxford, New York, Seoul, Tokyo, pp.529–546.
Murkute, M., Sinha, A.K., Murthy, V.M.S.R. (2005) A review of rock mass classification system for support design in Indian coal mine development roadways- A strategy for improvement. Seminar on First Indian Mineral Congress pp.56–65.
Paul, A., Kumar, N., Kumar, P., Singh, A.K. (2020) Application of CMRI-ISM RMR for Stability analysis of development workings for Ballarpur underground coal mine — An Empirical and Numerical Approach. Jour. Geol. Soc. India, v.96, pp.163–170. doi:https://doi.org/10.1007/s12594-020-1524-y.
Paul, A., Murthy, V.M.S.R., Prakash, A., Singh, A.K. (2018) Estimation of rock load in development workings of underground coal mines — A modified (RMRdyn) approach. Curr. Sci., v.114(10), pp.2167–2174.
Paul, A., Murthy, V.M.S.R., Prakash, A., Singh, A.K. (2020) Prediction of rock load emphasizing excavation damage of in-situ rock caused by blasting in coal mines. Curr. Sci., v.118(1), pp.123–132.
Paul, A., Singh, A.K., Rao, D.G., Kumar, N. (2009) Empirical approach for estimation of rock load in development workings of room and pillar mining, Jour. Sci. Indian Res., v.68, pp.214–216.
Paul, A., Singh, A. P., John, L. P., Singh, A. K., Khandelwal, M., (2012) Validation of RMR-based support design using roof bolts by numerical modeling for underground coal mine of Monnet Ispat, Raigarh, India—a case study, Arab Jour. Geosci., v.5, pp.1435–1448.
Prakash, A., Kumar, N., Singh, A., Paul, A. (2018) A safe depillaring design for shallow depth of cover with influence of surface ground movements: a study in Jharia Coalfield. Arab. Jour. Geosci., v.11(08), pp.1–8.
Ran, J.J. (2019) Safe mining practices under wide spans in underground non caving mines — case studies. Internat. Jour. Min. Sci. Tech., v.29, pp.535–540.
Ritter, W. (1879) Die static der tunnelgewolbe, Berlin: Springer.
Sheorey, P.R. (1993) Application of modern rock classification in coal mines roadways. Comprehensive Rock Engineering, Pergamon Press Oxford, New York, Seoul, Tokyo. pp.411–431.
Sheorey, P.R. (1994) A theory for in-situ stresses in isotropic and transversely isotropic rock. Internat. Jour. Rock Mech. Min. Sci., v.31, pp.23–34.
Singh, A.K., Paul, A., Sinha, A., and Saikia, K. (2005) Geotechnical investigation for support design in Depillaring panels in Indian Coal Mines. Jour. Sci. Indian Res., v.64, pp.358–363.
Suresh, R., Murthy V.M.S.R. (2005) Seismic Characterisation of Coalmine roof for rock load assessment. First Indian Mineral Congress, Dhanbad, Jharkhand, India, pp.31–46.
Terzaghi, K. (1946) Rock defects and rock loads on tunnel supports, Rock tunneling with steel supports (ed. Proctor and White), v.1, pp.17–99.
Ventakteswarlu, V. and Raju, N.M. (1987) Support design for mine roadways — a geotechnical approach. In: World Mining Congress13th (Stockholm), pp.857–864.
Venkateswarlu, V., Ghosh, A.K., Raju, N.M. (1989) Rock Mass Classification for Design of Roof Support — A Statistical Evaluation of Parameters. Min. Sci. Tech., v.8, pp.97–108.
Acknowledgement
Authors are obliged to the mine management for providing all the required support while executing the above study. Their help in site preparation, various geotechnical studies and collection of sample for conducting study is appreciable and thankfully acknowledged. Authors would also like to thank Director, CSIR — Central Institute of Mining and Fuel Research, Dhanbad, India for his inspiration and smoothing the research work.
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Paul, A., Prakash, A., Kumar, N. et al. Integration of Numerical and Empirical Approaches for Assessment of Apt Support Design for Various Underground Openings of Chromite Mine. J Geol Soc India 98, 851–858 (2022). https://doi.org/10.1007/s12594-022-2076-0
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DOI: https://doi.org/10.1007/s12594-022-2076-0