Effect of Rock Fracture Toughness and Mineralogy on Cutting Performance of Surface Miner – Some Investigations

Jump To References Section

Authors

  • Amar Prakash
     Scientists, Central Institute of Mining & Fuel Research, Dhanbad 826 015 ,IN
  • V. M. S. R. Murthy
     Professor, Dept. of Mining Engg, Indian School of Mines, Dhanbad 826 004 ,IN
  • Kalendra Bahadur Singh
     Scientists, Central Institute of Mining & Fuel Research, Dhanbad 826 015 ,IN
  • Akella Satya Venkatesh
     Professor, Department of Applied Geology, Indian School of Mines, Dhanbad 826 004 ,IN

Keywords:

Fracture Toughness, Mineralogy, Surface Miner, Limestone, Production.

Abstract

Cuttability of rocks is intimately related to the variation in fracture and micro-petrographic properties of the rocks. An understanding of fracture mechanism and fracture toughness (FT) of rocks is useful to evaluate production performance of rock cutting machines. A study was conducted on rock samples collected from two limestone mines located in India where surface miner (SM), a popular drum type cutting machine, was used for excavation of rock. FT in Mode I was measured by Chevron edge notched round bar (CENRB) method. A simple and accurate procedure of sample preparation of specified dimension, and experimental approach for determining the FT has been discussed in this paper. The study also covers the relation between fracture toughness and mineralogy of limestone as well as their role in estimating production performance by SM. FT was found to be strongly related to uniaxial compressive strength (σc), point load strength index (Is) and Young's modulus (E). The study shows that the fracture toughnessof the rock is governed by the configuration of carbonate grains, grain texture and grain matrix. FT was also found to decrease with increase in marl content resulting in increase of production performance of SM. Principal component analysis (PCA) was also conducted to develop a correlation matrix for FT and its inter-relationships with other influencing parameters. Critical strain energy release rate (GIC) was also found to be related with production performance of SM.

Downloads

Download data is not yet available.

Downloads

Published

2022-10-18

How to Cite

Prakash, A., Murthy, V. M. S. R., Singh, K. B., & Venkatesh, A. S. (2022). Effect of Rock Fracture Toughness and Mineralogy on Cutting Performance of Surface Miner – Some Investigations. Journal of Mines, Metals and Fuels, 64(9), 386–394. Retrieved from https://informaticsjournals.com/index.php/jmmf/article/view/31576

Issue

Volume 64, Issue 9, September 2016

Section

Articles

License

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

References

Adams, T. F., Demuth, R. B., Keller, C. F. and Margolin, L. G. (1985): An shale code. Fragmentation by blasting, in: Fourney, W.L. et al. (Eds.), 1st ed. SEM, Littleton CT, pp. 147-157.

Alber, M. and Brardt, A. (2003): “Factors influencing fracture toughness KIC from simple screening tests.” Int. J. Rock Mech. Min. Sci. 40, 779-784.

Al-Jassar, S. H. and Hawkins, A. B. (1977): Geotechnical properties of the carboniferous limestone of the Bristol area. Proceedings of the 4th International Congress International Society Rock Mechanics, Montreux, pp. 3-13.

Al-Shayea, N. A., Khan, K., Abduljauwad, S. N. (2000): “Effects of confining pressure and temperature on mixed-mode (I-II) fracture toughness of a limestone rock.” Int. J. Rock Mech. Min. Sci. 37, 629-643.

Artur, D. (2003): “Structural control on fracture toughness (brittle cracking) in the Krosno Sandstones of Mucharz, southern Poland.” Geol. Quar. 47 (1), 21-28.

Backers, T. (2004): “Fracture toughness determination and micromechanics of rock under mode I and mode II loading. Scientific technical report STR 05/05,” GeoForschungsZentrum Potsdam ISSN 1610-0956.

Bearman, R. A., Barley, R. W. and Hitchcock, A. (1991): “Prediction of power consumption and product size in cone crushing.” Minerals Eng. 4(12), 1243-1256.

Bellair, M. and Pomerol, L. (1980): Tratado de Geologi´a. Ed. Limusa.Mexico.

Chong, K. P. and Kuruppu, M. D. (1984): “New specimen for fracture toughness determination of rock and other materials.” Int. J. Frac. 26, R59-R62.

Deliac, E. P. (1986): Optimization des machines d'abattage a pics. PhD Thesis, University of Paris, France.

Evans, A. G. (1972): “A method for evaluating the time dependent failure characteristics of brittle materials and its application to polycrystalline alumina.” J. Mat. Sci. 7, 1137-1146.

Franklin, J. A., Broch, E. and Walton, G. (1971): “Logging the mechanical character of rock.” Trans. Inst. Min. Met., Section A, 1-9.

Grady, D. (1985): The mechanics of fracture under high-rate stress loading. Mechanics of Geomaterials; Rocks, Concretes, Soils, in: Bazant, Z.P.I. (Ed.), Wiley: Chichester, pp. 129-156.

Gunsallus, K. L. and Kulhawy, F. H. (1984): “A comparative evaluation of rock strength measures.” Int. J. Rock Mech. Min. Sci. Geom. Abstract. 21, 233-248.

Guo, H. (1990): Rock cutting using fracture mechanics principles. PhD Thesis, University of Wollongong, NSW, Australia.

Guo, H., Aziz, N. I. and Schmidt, L. C. (1993): “Rock fracture toughness determination by the Brazilian test.” Eng. Geo. 33, 177-188.

Ingraffea, A. R., Gunsallus, K. L., Beech, J. F. and Nelson, P. (1982): A fracture toughness testing system for prediction of tunnel boring machine performance. Proceedings of 23rd US symposium on Rock Mechanics, The University of California, pp. 463-470.

ISRM (1995): Suggested methods for determining mode 1 fracture toughness using cracked chevron notched brazilian disc, January.

James, G. D. (2003): Fracture toughness based models for the prediction of power consumption, product size, and capacity of jaw crushers. PhD Thesis, Mining and mineral engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA.

Kanninen, M. F. and Popelar, C. H. (1985): Advanced fracture mechanics. Oxford engineering science series, 15, Oxford University Press, New York.

Ke, C. C., Chen, C. S. and Tu, C. H. (2008): “Determination of fracture toughness of anisotropic rocks by boundary element method.” Rock Mech. Rock Eng. 41(4), 509-538.

Kuruppu, M. D. (1997): “Fracture toughness measurement using chevron notched semi-circular bend specimen.” Int. J. Frac. 86, L33-L38.

Lindqvist, P. A. (1982): Rock fragmentation by indentation and disc cutting. PhD Thesis, 20D, LulefiUnivTechn, LuleS, Sweden.

Marder, M. and Fineberg, J. (1996): “How things break.” Physics Today, 24-29.

McHugh, S. and Keough, D. (1982): Use of laboratory-derived data to predict fracture and permeability enhancement in explosive-pulse tailored field tests. Proceedings of 23rd US symposium on Rock Mechanics, AIME, New York, pp. 504-514.

Nath, S. K. and Das, U. K. (2006): “Effect of microstructure and notches on the fracture toughness of medium carbon steel.” J. Naval Arch Marine Eng., ANAME Publication, June 3, 15-22.

Nelson, P. P. and Fong, F. L. C. (1986): Characterization of rock for boreability using fracture material properties. Proceedings of 27th US symposium on Rock Mechanics, SME, Littleton, CO, pp. 846-852.

Nilson, R. H. and Griffiths, S. K. (1986): “Similarity analysis of energy transport in gas-driven fractures.” Int. J. Frac. 30, 115-134.

Prakash, A. (2013): A study into the influence of intact rock and rock mass properties on the performance of surface miners in Indian geo-mining conditions. PhD Thesis, Mining Engineering, Indian School of Mines, Dhanbad.

Rao, Q. (1999): Pure shear fracture of brittle rock. PhD Thesis, Division of rock mechanics, Luleå University, Sweden.

Rilem, T. C. (1985): “Determination of fracture energy of mortar and concrete by means of three- point bend tests on notched beams.” Mat. Struc. 18(106), 285-290.

Rummel, F. and Winter, R. B. (1982): Application of laboratory fracture mechanics data to hydraulic fracturing field tests. Proceedings of 1st Japan-USA seminar on Geothermal Energy and Hydraulic Fracturing, pp. 31-39.

Rustan, R. A., Vutukuri, V. S. and Naarttijirvi, T. (1983): The influence from specific charge, geometric scale and physical properties of homogeneous rock on fragmentation. Proceedings of 1stInternational symposium on Rock Fragmentation by Blasting, LulefiUnivTechn, LuleA 1, pp. 115-142.

Saouma, V. E. and Kleinosky, M. J. (1984): Finite element simulation of rock cutting: a fracture mechanics approach. Proceedings of 25th US symposium on Rock Mechanics, AIME, New York, pp. 792-799.

Schreurs, P. J. G. (2011): Fracture mechanics. Lecture notes - course 4A780 Concept version, Eindhoven University of Technology, Department of mechanical engineering materials technology, September 13, 173 p.

Shiryaev, A. and Kotkis, A. M. (1982): “Methods for determining fracture toughness of brittle porous materials.” Indus. Lab. 48, 917-918.

Thiercelin, M. and Roegiers, J. M. (1986): Fracture toughness with the modified ring test. Proceedings of 27th US symposium on Rock Mechanics, Alabama, pp. 284-290.

Thuro, K. and Spaun, G. (1996): Introducing the ‘destruction work’ as a new rock property of toughness referring to drillability in conventional drill and blast tunnelling. Prediction and performance in rock mechanics and rock engineering, Eirock '96, 2, 1440 S, Rotterdam Brookfield.