In the present study, a combined finite/element approach is used to analyze failure characteristics of a rectangular hard rock with different sample height-to-width ratios based on the uniaxial compression test. The objective of this paper is to illustrate the transitional mechanisms from shear fracture to extension failure of brittle rocks and the occurrence conditions of surface-parallel slabbing. Numerical results show that failure modes have experienced the shear, tension with shear and surface-parallel slabbing failure with the decrease of sample height-to-width ratios. It is seen from the simulation results that the shear band in larger height-to-width ratios is composed of an amount of extension meso-cracks that are parallel to the loading direction, and the slabbing failure tends to be the result of the accessible propagation of extension meso-cracks due to short sample height, which validate the essence of extension failure in hard rocks. The good agreement between simulation and laboratory testing also shows the practicability and advancement of a combined finite/discrete element approach.
Accepted:
Published online:
Fan Feng 1; Xibing Li 1; Diyuan Li 1
@article{CRMECA_2017__345_5_317_0,
author = {Fan Feng and Xibing Li and Diyuan Li},
title = {Modeling of failure characteristics of rectangular hard rock influenced by sample height-to-width ratios: {A} finite/discrete element approach},
journal = {Comptes Rendus. M\'ecanique},
pages = {317--328},
publisher = {Elsevier},
volume = {345},
number = {5},
year = {2017},
doi = {10.1016/j.crme.2017.03.001},
language = {en},
}
TY - JOUR AU - Fan Feng AU - Xibing Li AU - Diyuan Li TI - Modeling of failure characteristics of rectangular hard rock influenced by sample height-to-width ratios: A finite/discrete element approach JO - Comptes Rendus. Mécanique PY - 2017 SP - 317 EP - 328 VL - 345 IS - 5 PB - Elsevier DO - 10.1016/j.crme.2017.03.001 LA - en ID - CRMECA_2017__345_5_317_0 ER -
%0 Journal Article %A Fan Feng %A Xibing Li %A Diyuan Li %T Modeling of failure characteristics of rectangular hard rock influenced by sample height-to-width ratios: A finite/discrete element approach %J Comptes Rendus. Mécanique %D 2017 %P 317-328 %V 345 %N 5 %I Elsevier %R 10.1016/j.crme.2017.03.001 %G en %F CRMECA_2017__345_5_317_0
Fan Feng; Xibing Li; Diyuan Li. Modeling of failure characteristics of rectangular hard rock influenced by sample height-to-width ratios: A finite/discrete element approach. Comptes Rendus. Mécanique, Volume 345 (2017) no. 5, pp. 317-328. doi : 10.1016/j.crme.2017.03.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.03.001/
[1] Critical problems of study of slabbing failure of surrounding rock in deep hard rock tunnel and research progress, Rock Soil Mech., Volume 36 (2015) no. 10, pp. 2737-2749
[2] Hybrid fracture and the transition from extension fracture to shear fracture, Nature, Volume 428 (2004), pp. 63-66
[3] Experimental study of slabbing and rockburst induced by true-triaxial unloading and local dynamic disturbance, Rock Mech. Rock Eng., Volume 49 (2016) no. 9, pp. 3437-3453
[4] Experimental Rock Mechanics, CRC Press, Boca Raton, FL, USA, 2007
[5] The axial cleavage fracture 1: axial cleavage fracturing, a significant process in mining and geology, Eng. Geol., Volume 1 (1965) no. 1, pp. 31-72
[6] Influence of sample height-to-width ratios on failure mode for rectangular prism samples of hard rock loaded in uniaxial compression, Rock Mech. Rock Eng., Volume 44 (2011) no. 3, pp. 253-267
[7] Brittle fracture of rocks (W.R. Judd, ed.), State of Stress in the Earth's Crust, Elsevier, New York, 1964, pp. 111-174
[8] Study of brittle rock fracture in laboratory compression experiments, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., Volume 7 (1970) no. 5, pp. 561-575
[9] Axial splitting of rocks under uniaxial compression, Int. J. Rock Mech. Min. Sci., Volume 79 (2015), pp. 124-134
[10] Variational fracture mechanics to model compressive splitting of masonry-like materials, Ann. Solid Struct. Mech., Volume 2 (2011), pp. 57-67
[11] Size effect on acoustic emission characteristics of coal-rock damage evolution, Adv. Mater. Sci. Eng., Volume 2017 (2017), pp. 1-8
[12] The behaviour of tunnels at great depth under large static and dynamic pressures, Tunn. Undergr. Space Technol., Volume 16 (2001) no. 1, pp. 41-48
[13] The strength of hard-rock pillars, Int. J. Rock Mech. Min. Sci., Volume 37 (2000) no. 8, pp. 1239-1246
[14] Frictional crack initiation and propagation analysis using the numerical manifold method, Comput. Geotech., Volume 39 (2012) no. 1, pp. 38-53
[15] Fracture initiation and propagation in a Brazilian disc with a plane interface: a numerical study, Rock Mech. Rock Eng., Volume 46 (2013) no. 2, pp. 289-302
[16] Applications of finite/discrete element modeling to rock engineering problems, Int. J. Geomech., Volume 13 (2013) no. 5, pp. 565-580
[17] A combined finite-discrete element method in transient dynamics of fracturing solids, Int. J. Eng. Comput., Volume 12 (1995) no. 2, pp. 147-174
[18] Influence of intermediate principal stress on rock fracturing and strength near excavation boundaries-insight from numerical modeling, Int. J. Rock Mech. Min. Sci., Volume 45 (2008) no. 5, pp. 763-772
[19] A modification of the Coulomb–Mohr theory of fracture, J. Appl. Mech., Volume 28 (1961) no. 2, pp. 259-268
[20] The Finite Element Modelling of Discrete Fracture in Quasi-Brittle Materials, University of Wales, Swansea, Wales, 2000
[21] Rockfield, Rockfield Software Ltd, Technium, Kings Road, Prince of Wales Dock, Swansea, SA1 8PH, UK, 2013.
[22] Damage characterization during laboratory strength testing: a 3D-finite-discrete element approach, Comput. Geotech., Volume 60 (2014) no. 7, pp. 33-46
[23] Soft, stiff and servo-controlled testing machines: a review with reference to rock failure, Eng. Geol., Volume 6 (1972) no. 3, pp. 155-189
[24] Influence of specimen height-to-width ratio on the strainburst characteristics of Tianhu granite under true-triaxial unloading conditions, Can. Geotech. J., Volume 52 (2014) no. 7, pp. 890-902
[25] Seventeenth Canadian geotechnical colloquium: the effect of cohesion loss and stress path on brittle rock strength, Can. Geotech. J., Volume 34 (1997) no. 5, pp. 698-725
[26] Criteria for strength and structural failure of rocks based on energy dissipation and energy release principles, Chin. J. Rock Mech. Eng., Volume 24 (2005) no. 17, pp. 3003-3010
[27] Rockburst prediction based on elastic strain energy, Chin. J. Rock Mech. Eng., Volume 34 (2015) no. 9, pp. 1886-1893
Cited by Sources:
Comments - Policy