Geomechanics and Engineering

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Experimental and numerical study on the fracture coalescence behavior of rock-like materials containing two non-coplanar filled fissures under uniaxial compression

  • Tian, Wen-Ling (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology) ;
  • Yang, Sheng-Qi (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology)
  • Received : 2016.07.18
  • Accepted : 2016.11.22
  • Published : 2017.03.30
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Abstract

In this research, experimental and numerical simulations were adopted to investigate the effects of ligament angle on compressive strength and failure mode of rock-like material specimens containing two non-coplanar filled fissures under uniaxial compression. The experimental results show that with the increase of ligament angle, the compressive strength decreases to a nadir at the ligament angle of $60^{\circ}$, before increasing to the maximum at the ligament angle of $120^{\circ}$, while the elastic modulus is not obviously related to the ligament angle. The shear coalescence type easily occurred when ${\alpha}$ < ${\beta}$, although having the same degree difference between the angle of ligament and fissure. Numerical simulations using $PFC^{2D}$ were performed for flawed specimens under uniaxial compression, and the results are in good consistency with the experimental results. By analyzing the crack evolution process and parallel bond force field of rock-like material specimen containing two non-coplanar filled fissures, we can conclude that the coalescence and propagation of crack are mainly derived from parallel bond force, and the crack initiation and propagation also affect the distribution of parallel bond force. Finally, the displacement vectors in ligament region were used to identify the type of coalescence, and the results coincided with that obtained by analyzing parallel bond force field. These experimental and numerical results are expected to improve the understanding of the mechanism of flawed rock engineering structures.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of Jiangsu, Central Universities

References

  1. Bahaaddini, M., Hebblewhite, B.K. and Sharrock, G. (2013), "Numerical investigation of the effect of joint geometrical parameters on the mechanical properties of a non-persistent jointed rock mass under uniaxial compression", Comput. Geotech., 49(20), 2485-2488.
  2. Bobet, A. and Einstein, H.H. (1998), "Fracture coalescence in rock-type materials under uniaxial and biaxial compression", Int. J. Rock Mech. Min. Sci., 35(7), 863-888. https://doi.org/10.1016/S0148-9062(98)00005-9
  3. Gehle, C. and Kutter, H.K. (2003), "Breakage and shear behavior of intermittent rock joints", Int. J. Rock Mech. Min. Sci., 40(5), 687-700. https://doi.org/10.1016/S1365-1609(03)00060-1
  4. Gerolymatou, E. and Triantafyllidis, T. (2016), "Shearing of materials with intermittent joints", Rock Mech. Rock Eng., 49(7), 2689-2700. https://doi.org/10.1007/s00603-016-0956-6
  5. Haeri, H., Shahriar, K., Marji, M.F. and Moarefvand, P. (2014), "Experimental and numerical study of crack propagation and coalescence in pre-cracked rock-like disks", Int. J. Rock Mech. Min. Sci., 67(4), 20-28.
  6. Haeri, H., Khaloo, A. and Marji, M.F. (2015), "Experimental and numerical analysis of Brazilian discs with multiple parallel cracks", Arab J. Geosci., 8(8), 5897-5908. https://doi.org/10.1007/s12517-014-1598-1
  7. Huang, D., Gu, D., Yang, C. and Fu, G. (2016), "Investigation on mechanical behaviors of sandstone with two preexisting flaws under triaxial compression", Int. J. Rock Mech. Min. Sci., 49(2), 1-25.
  8. Janeiro, R.P. and Einstein, H.H. (2010), "Experimental study of the cracking behavior of specimens containing inclusions (under uniaxial compression)", Int. J. Fract., 164 (1), 83-102. https://doi.org/10.1007/s10704-010-9457-x
  9. Lee, H.W. and Jeon, S. (2011), "An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression", Int. J. Solids Struct., 48(6), 979-999. https://doi.org/10.1016/j.ijsolstr.2010.12.001
  10. Li, H.Q. and Wong, L.N.Y. (2014), "Numerical study on coalescence of pre-existing flaw pairs in rock-like material", Rock Mech. Rock Eng., 47(6), 2087-2210. https://doi.org/10.1007/s00603-013-0504-6
  11. Lin, P., Robina, H.C., Wong, H.C. and Tang, C.A. (2015), "Experimental study of coalescence mechanisms and failure under uniaxial compression of granite containing multiple holes", Int. J. Rock Mech. Min. Sci., 77, 313-327.
  12. Liu, H. and Zhang, L. (2015), "A compressive damage constitutive model for rock mass with a set of nonpersistently closed joints under biaxial conditions", Math. Problems Eng., 40(11), 1-10.
  13. Park, C.H. and Bobet, A. (2009), "Crack coalescence in specimens with open and closed flaws: A comparison", Int. J. Rock Mech. Min. Sci., 46(5), 819-829. https://doi.org/10.1016/j.ijrmms.2009.02.006
  14. Prudencio, M. and Jan, M.V.S. (2007), "Strength and failure modes of rock mass models with non-persistent joints", Int. J. Rock Mech. Min. Sci., 44(6), 890-902. https://doi.org/10.1016/j.ijrmms.2007.01.005
  15. Sagong, M. and Bobet, A. (2002), "Coalescence of multiple flaws in a rock-model material in uniaxial compression", Int. J. Fract., 39(2), 229-241.
  16. Shen, B., Stephansson, O., Einstein, H.H. and Ghahreman, B. (1995), "Coalescence of fractures under shear stresses in experiments", J. Geophys. Res. Solid Earth, 100(B4), 5975-5990. https://doi.org/10.1029/95JB00040
  17. Wang, L.H., Bai, J.L., Sun, X.S., Li, J.L., Tang, K.Y. and Deng, H.F. (2015), "The triaxial loading and unloading mechanical properties of jointed rock masses with different joint connectivities", Chinese J. Rock Mech. Eng., 34(12), 2500-2508.
  18. Wong, R.H.C. and Chau, K.T. (1998), "Crack coalescence in a rock-like material containing two cracks", Int. J. Rock Mech. Min. Sci., 35(2), 147-164. https://doi.org/10.1016/S0148-9062(97)00303-3
  19. Wong, L.N.Y. and Einstein, H.H. (2009), "Systematic evaluation of cracking behavior in specimens containing single flaws under uniaxial compression", Int. J. Rock Mech. Min. Sci., 46(2), 239-249. https://doi.org/10.1016/j.ijrmms.2008.03.006
  20. Xiao, T.L., Li, X.P. and Jia, S.P. (2015), "Failure characteristics of rock with two pre-existing transfixion cracks under triaxial compression", Chinese J. Rock Mech. Eng., 34(12), 2455-2462.
  21. Xu, N.W., Dai, F., Wei, M.D. and Zhao, T. (2016), "Numerical observation of three-dimensional wing cracking of cracked chevron notched Brazilian disc rock specimen subjected to mixed mode loading", Rock Mech. Rock Eng., 49(1), 79-96. https://doi.org/10.1007/s00603-015-0736-8
  22. Yang, S.Q. (2015), "An experimental study on fracture coalescence characteristics of brittle sandstone specimens combined various flaws", Geomech. Eng., Int. J., 8(4), 541-557. https://doi.org/10.12989/gae.2015.8.4.541
  23. Yang, S.Q. and Jing, H.W. (2011), "Strength failure and crack coalescence behavior of brittle sandstone samples containing a single fissure under uniaxial compression", Int. J. Fract., 168(2), 227-250. https://doi.org/10.1007/s10704-010-9576-4
  24. Yang, S.Q., Jiang, Y.Z., Xu, W.Y. and Chen, X.Q. (2008), "Experimental investigation on strength and failure behavior of pre-cracked marble under conventional triaxial compression", Int. J. Solids Struct., 45(17), 4796-4819. https://doi.org/10.1016/j.ijsolstr.2008.04.023
  25. Yang, S.Q., Tian, W.L., Huang, Y.H., Ranjith, P.G. and Ju, Y. (2016), "An experimental and numerical study on cracking behavior of brittle sandstone containing two non-coplanar fissures under uniaxial compression", Rock Mech. Rock Eng., 49(4), 1497-1515. https://doi.org/10.1007/s00603-015-0838-3
  26. Yang, S.Q., Ranjith, P.G., Jing, H.W., Tian, W.L. and Ju, Y. (2017), "An experimental investigation on thermal damage and failure mechanical behavior of granite after exposure to different high temperature treatment", Geothermics, 65, 180-197. https://doi.org/10.1016/j.geothermics.2016.09.008
  27. Zhang, X.P. and Wong, N.Y. (2012), "Cracking processes in rock-like material containing a single flaw under uniaxial compression: a numerical study based on parallel bonded-particle model approach", Rock Mech. Rock Eng., 45(5), 711-737. https://doi.org/10.1007/s00603-011-0176-z
  28. Zhang, X.P. and Wong, L.N.Y. (2013), "Crack initiation, propagation and coalescence in rock-like material containing two flaws: a numerical study based on bonded-particle model approach", Rock Mech. Rock Eng., 46(5), 1001-1021. https://doi.org/10.1007/s00603-012-0323-1
  29. Zhang, B., Li, S.C., Zhang, D.F., Li, M.T. and Shao, D.L. (2012), "Uniaxial compression mechanical property test, fracture and damage analysis of similar material of jointed rock mass with filled cracks", Rock Soil Mech., 33(6), 1647-1652.
  30. Zhuang, X.Y., Chun, J.W. and Zhu, H.H. (2014), "A comparative study on unfilled and filled crack propagation for rock-like brittle material", Theor. Appl. Fract. Mech., 72, 110-120. https://doi.org/10.1016/j.tafmec.2014.04.004

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