Commenced in January 2007
Paper Count: 32017
Physical and Mechanical Phenomena Associated with Rock Failure in Brazilian Disc Specimens
Abstract:Failure mechanism of rocks is one of the fundamental aspects to study rock engineering stability. Rock is a material that contains flaws, initial damage, micro-cracks, etc. Failure of rock structure is largely due to tensile stress and was influenced by various parameters. In the present study, the effect of brittleness and loading rate on the physical and mechanical phenomena produced in rock during loading sequences is considered. For this purpose, Acoustic Emission (AE) technique is used to monitor fracturing process of three rock types (onyx marble, sandstone and soft limestone) with different brittleness and sandstone samples under different loading rate. The results of experimental tests revealed that brittleness and loading rate have a significant effect on the mode and number of induced fracture in rocks. An increase in rock brittleness increases the frequency of induced cracks, and the number of tensile fracture decreases when loading rate increases.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1315557Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 837
 Jaeger JC, Cook NGW, Zimmerman RW., (2007); Fundamentals of rock mechanics. 4th ed. Oxford: Blackwell.
 Cai M., He M., Liu D., (2002); Rock mechanics and engineering. Beijing: Science Press.
 Cai M., Liu D., (2009); Study of failure mechanisms of rock under compressive – shear loading using real-time laser holography. International Journal of Rock Mechanics & Mining Sciences 46; 59– 68
 Hoek E, Bieniawski ZT. (1965); Brittle fracture propagation under compression. Int J Fract Mech;1:137–55.
 Bieniawski ZT. (1967); Mechanism of brittle fracture of rock. Part II — experimental studies. Int J Rock Mech Min Sci GeomechAbstr; 4(4):407–23.
 Wawersik W., Fairhurst C. (1970); A study of brittle rock fracture in laboratory compression experiments. Int J Rock Mech Min SciGeomechAbstr; 7:561–75.
 Chen Y. L., Ni J., Shao W., Zhou Y. C., Javadi A., Azzam R., (2011); Coalescence of Fractures Under Uni-axial Compression and Fatigue Loading. Rock Mech Rock Eng; DOI 10.1007/s00603-011-0186-x
 Feng X.T., Ding W and Zhang D, 2009, Multi-crack interaction in limestone subject to stress and flow of chemical solutions, International Journal of Rock Mechanics and Mining Sciences 46, 159-171.
 Pan PZ, Feng XT, Hudson JA (2012) The influence of the intermediate principal stress on rock failure behaviour: a numerical study. Engineering Geology, 124, 109-118.
 Pu, C. Z., & Ping, C. A. O. (2012). Failure characteristics and its influencing factors of rock-like material with multi-fissures under uniaxial compression. Transactions of Nonferrous Metals Society of China, 22(1), 185-191.
 Aggelis DG, Soulioti DV, Sapouridis N, Barkoula NM, Paipetis AS, Matikas TE (2011) Acoustic emission characterization of the fracture process in fibre reinforced concrete. Construction and Building Materials 25: 4126–4131.
 Aggelis, D. G., Mpalaskas, A. C., &Matikas, T. E. (2013). Acoustic signature of different fracture modes in marble and cementitious materials under flexural load. Mechanics Research Communications, 47, 39-43.
 Ren X, Chen J, Li J, Slawson TR, Roth MJ (2011) Micro-cracks informed damage models for brittle solids. International Journal of Solids and Structures 48: 1560–1571.
 Young RP, Martin CD (1993) Potential role of acoustic emission/microseismicity investigations in the site characterization and performance monitoring of nuclear waste repositories, Int. J. Rock Mech. Min. Sci. 30, 797–803.
 Shah SG, Kishen JMC (2012) Use of acoustic emissions in flexural fatigue crack growth studies on concrete. Engineering Fracture Mechanics 87: 36–47.
 Sabri M, Ghazvinian A, Nejati HR. (2016) Effect of particle size heterogeneity on fracture toughness and failure mechanism of rocks.Int J of Rock Mech& Mining Sci: 81:79-85.
 Nazerigivi, A., Nejati H. R., Ghazvinian A., &Najigivi, A. (2017), “Influence of nano-silica on the failure mechanism of concrete specimens”, Computers and Concrete, 19(4), 427-432.
 Antonaci P, Bocca P, Masera D (2012) Fatigue crack propagation monitoring by Acoustic Emission signal analysis. Engineering Fracture Mechanics 81: 26–32.
 Kurz JH, Finck F, Grosse CU, Reinhardt HW (2005) Stress drop and stress redistribution in concrete quantified over time by the “b-value” analysis. Struct Health Monit 5:69–8.
 Gutenberg B, Richte C (1949) Seismicity of the Earth and Associated Phenomena. Princeton University Press.
 Zhu WC, Tang CA (2006) Numerical simulation of Brazilian disk rock failure under static and dynamic loading. International Journal of Rock Mechanics & Mining Sciences 43: 236–252.
 Ramulu M, Kobayashi AS (1985) Mechanics of crack curving and branching-a dynamic fracture analysis. International Journal of Fracture 27: 187-201.