Geomechanics and Engineering

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Scale effect of mechanical properties of jointed rock mass: A numerical study based on particle flow code

  • Wang, Xiao (School of Civil Engineering, Southeast University) ;
  • Yuan, Wei (School of Civil Engineering, Southeast University) ;
  • Yan, Yatao (School of Civil Engineering, Southeast University) ;
  • Zhang, Xue (College of Mining and Safety Engineering, Shandong University of Science and Technology)
  • Received : 2020.02.12
  • Accepted : 2020.03.17
  • Published : 2020.05.10
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Abstract

The synthetic rock mass (SRM) were used to investigate the influence of specimen size on the mechanical properties of jointed rock mass. The SRM were established based on parallel bond model (PBM) and smooth joint model (SJM) and the scaled rock specimens were sampled in two SRMs considering three sampling locations. The research results show that the smaller the initial fracture density is, the greater the uniaxial compressive strength (UCS), elastic modulus (E) is when compared with the same sampling location. The mechanical properties of rock specimens obtained by different sampling methods in different SRMs have different scale effects. The strength of rock specimens with more new cracks is not necessarily less than that of rock specimens with fewer new cracks and the failure of rock is caused by the formation of macro-fracture surface.

Keywords

Acknowledgement

This research is supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX19-0094).

References

  1. Bahaaddini, M., Sharrock, G. and Hebblewhite, B.K. (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, 206-225. https://doi.org/10.1016/j.compgeo.2012.10.012.
  2. Bahrani, N. and Kaiser, P.K. (2016), "Numerical investigation of the influence of specimen size on the unconfined strength of defected rocks", Comput. Geotech., 77, 56-67. https://doi.org/10.1016/j.compgeo.2016.04.004.
  3. Itasca Consulting Group Inc. (2014), "PFC (particle flow code), version 5.0". ICG, Minneapolis, Minnesota, U.S.A., http://www.itascacg.com/software/pfc.
  4. Kim, J.S., Kim, G.Y ., Baik, M.H. and Cho, G.C. (2019), "A new approach for quantitative damage assessment of in-situ rock mass by acoustic emission", Geomech. Eng., 18(1), 11-20. https://doi.org/10.12989/gae.2019.18.1.011.
  5. Lee, H. 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.
  6. Morris, J.P., Rubin, M.B., Block, G.I. and Bonner, M.P. (2006), "Simulations of fracture and fragmentation of geologic materials using combined FEM/DEM analysis", Int. J. Impact Eng., 33(1-12), 463-473. https://doi.org/10.1016/j.ijimpeng.2006.09.006.
  7. Potyondy, D.O. (2015), "The bonded-particle model as a tool for rock mechanics research and application: Current trends and future directions", Geosyst. Eng., 18(1), 1-28. https://doi.org/10.1080/12269328.2014.998346.
  8. Shemirani, A.B., Haeri, H., Sarfarazi, V. and Hedayat, A. (2017), "A review paper about experimental investigations on failure behaviour of non-persistent joint", Geomech. Eng., 13(4), 535-570. https://doi.org/10.12989/gae.2017.13.4.535.
  9. Singh, M. and Rao, K.S. (2005), "Empirical methods to estimate the strength of jointed rock masses", Eng. Geol., 77(1-2), 127-137. https://doi.org/10.1016/j.enggeo.2004.09.001.
  10. Song, H., Jiang, Y ., Elsworth, D., Zhao, Y.X., Wang, J.H. and Liu, B. (2018), "Scale effects and strength anisotropy in coal", Int. J. Coal Geol., 195, 37-46. https://doi.org/10.1016/j.coal.2018.05.006.
  11. Symons, I.F. (1970), "The effect of size and shape of specimen upon the unconfined compressive strength of cement-stabilized materials", Mag. Concrete Res., 22(70), 45-51. https://doi.org/10.1680/macr.1970.22.70.45.
  12. Torano, J., Diez, R.R., Cid, J.M.R. and Barciella, M.M.C. (2002), "FEM modeling of roadways driven in a fractured rock mass under a longwall influence", Comput. Geotech., 29(6), 411-431. https://doi.org/10.1016/S0266-352X(02)00006-X.
  13. Wang, P., Cai, M., Ren, F., Li, C.H. and Yang, T.H. (2017), "A digital image-based discrete fracture network model and its numerical investigation of direct shear tests", Rock Mech. Rock Eng., 50(7), 1801-1816. https://doi.org/10.1007/s00603-017-1200-8.
  14. Wang, X. and Tian, L. (2018), "Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions: A numerical study based on particle flow code", Environ. Earth Sci., 77(8), 297. https://doi.org/10.1007/s12665-018-7486-3.
  15. 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.
  16. Wu, N., Liang, Z., Zhou, J. and Zhang, Y. (2020), "Energy evolution characteristics of coal specimens with preformed holes under uniaxial compression", Geomech. Eng., 20(1), 55-66. https://doi.org/10.12989/gae.2019.18.6.627.
  17. Xi, Y., Jun, L., Zeng, Y. and Jiang, T. (2018), "Research on lateral scale effect and constitutive model of rock damage energy evolution", Geotech. Geol. Eng., 36(4), 2415-2424. https://doi.org/10.1007/s10706-018-0473-3.
  18. Zhang, Q., Wang, X., Tian, L. and Huang, D.M. (2018), "Analysis of mechanical and acoustic emission characteristics of rock materials with double-hole defects based on particle flow code", Shock Vib., 7065029. https://doi.org/10.1155/2018/7065029.

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