Investigation of Point Load Index Using Novel Discrete Based Model

Abstract:

In this study, a micro-mechanical model is developed to study the correlation of the point load index in rocks with uniaxial compressive strength (UCS) tests. The model is represented by an array of bonded particles simulated by a novel discrete based model, which was introduced by the authors previously. The point load test (PLT) is performed in the field on rock samples to classify and estimate the UCS of a rock type via the index-to-strength correlation factor k. Numerical analyses, such as the one presented in this work, will serve to close the knowledge gap concerning the correlation between k, UCS and other material properties of rocks.

• Periodical: Applied Mechanics and Materials (Volume 846)
• Pages: 348-353
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.846.348
• Online since: July 2016
• Authors: Somayeh Behraftar*, Joshua Heslin, S. Galindo Torres, Alexander Scheuermann
• Keywords: DSEM, Index to Strength Factor, Point Load Test, Uniaxial Compressive Strength

References

[1] J. Franklin, Suggested method for determining point load strength, in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1985, pp.51-60.

DOI: 10.1016/0148-9062(85)92327-7

[2] S. Galindo-Torres, D. Pedroso, D. Williams, and L. Li, Breaking processes in three-dimensional bonded granular materials with general shapes, Computer Physics Communications, vol. 183, pp.266-277, (2012).

DOI: 10.1016/j.cpc.2011.10.001

[3] S. G. T. Somayeh Behraftar, Alexander Scheuermann, David J. Williams, Eduardo Antonio G. Marques, Hossein JAnjani, A novel calibration methodology to obtain material parameters for the representation of fracture mechanics based on discrete element simulations, International Journal of Rock Mechanics and Mining Sciences 2015 (under revision).

DOI: 10.1016/j.compgeo.2016.08.029

[4] S. Galindo-Torres, F. Alonso-Marroquín, Y. Wang, D. Pedroso, and J. M. Castano, Molecular dynamics simulation of complex particles in three dimensions and the study of friction due to nonconvexity, Physical Review E, vol. 79, p.060301, (2009).

DOI: 10.1103/physreve.79.060301

[5] S. Galindo-Torres, A coupled Discrete Element Lattice Boltzmann Method for the simulation of fluid–solid interaction with particles of general shapes, Computer Methods in Applied Mechanics and Engineering, vol. 265, pp.107-119, (2013).

DOI: 10.1016/j.cma.2013.06.004

[6] J. B. M. Heslin, Site-Specific Correlation of the Point Load Index for the Hamersley Formation, Bachelor of Engineering Thesis, School of Civil Engineering, University of Queensland, October (2014).

[7] J. Rusnak and C. Mark, Using the point load test to determine the uniaxial compressive strength of coal measure rock, in Proceedings of the 19th International Conference on Ground Control in Mining. Morgantown, WV: West Virginia University, 2000, pp.362-371.

[8] ISRM, Suggested Method for Determing Point Load Strength, International Journal of Rock Mechanics: Blue Book, vol. 22, pp.51-60, (2007).

[9] E. Hoek, Rock mechanics laboratory testing in the context of a consulting engineering organization, in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1977, pp.93-101.

DOI: 10.1016/0148-9062(77)90201-7

[10] Z. Bieniawski, The point-load test in geotechnical practice, Engineering Geology, vol. 9, pp.1-11, (1975).

[11] E. Broch and J. Franklin, The point-load strength test, in International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1972, pp.669-676.

DOI: 10.1016/0148-9062(72)90030-7

[12] C. O'Sullivan, Particulate discrete element modelling: Taylor & Francis, (2011).