Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Energy evolution characteristics of coal specimens with preformed holes under uniaxial compression

  • Wu, Na (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Liang, Zhengzhao (State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology) ;
  • Zhou, Jingren (State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University) ;
  • Zhang, Lizhou (Chongqing Survey Institute)
  • Received : 2019.10.14
  • Accepted : 2019.12.26
  • Published : 2020.01.10
⟨ Previous Next ⟩

Abstract

The damage or failure of coal rock is accompanied by energy accumulation, dissipation and release. It is crucial to study the energy evolution characteristics of coal rock for rock mechanics and mining engineering applications. In this paper, coal specimens sourced from the Xinhe mine located in the Jining mining area of China were initially subjected to uniaxial compression, and the micro-parameters of the two-dimensional particle flow code (PFC2D) model were calibrated according to the experimental test results. Then, the PFC2D model was used to subject the specimens to substantial uniaxial compression, and the energy evolution laws of coal specimens with various schemes were presented. Finally, the elastic energy storage ratio m was investigated for coal rock, which described the energy conversion in coal specimens with various arrangements of preformed holes. The arrangement of the preformed holes significantly influenced the characteristics of the crack initiation stress and energy in the prepeak stage, whereas the characteristics of the cumulative crack number, failure pattern and elastic strain energy during the loading process were similar. Additionally, the arrangement of the preformed holes altered the proportion of elastic strain energy Ue in the total energy in the prepeak stage, and the probability of rock bursts can be qualitatively predicted.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

This study is supported by the National Natural Science Foundation of China (Grant No. 51779031 and 41977219).

References

  1. Bagde, M.N. and Petroš, V. (2009), "Fatigue and dynamic energy behaviour of rock subjected to cyclical loading", Int. J. Rock Mech. Min. Sci., 46(1), 200-209. https://doi.org/10.1016/j.ijrmms.2008.05.002.
  2. Bratov, V. and Petrov, Y. (2007), "Optimizing energy input for fracture by analysis of the energy required to initiate dynamic mode I crack growth", Int. J. Solids Struct., 44(7-8), 2371-2380. https://doi.org/10.1016/j.ijsolstr.2006.07.013.
  3. Bruning, T., Karakus, M., Nguyen, G.D. and Goodchild, D. (2018), "Experimental Study on the Damage Evolution of Brittle Rock Under Triaxial Confinement with Full Circumferential Strain Control", Rock Mech. Rock Eng., 51(11), 3321-3341. https://doi.org/10.1007/s00603-018-1537-7.
  4. Calleja, J. and Nemcik, J. (2016), "Coalburst Causes and Mechanisms", Proceedings of the Coal Operators Conference, Wollongong, Australia, February.
  5. Cho, N., Martin, C.D. and Sego, D.C. (2007), "A clumped particle model for rock", Int. J. Rock Mech. Min. Sci., 44(7), 997-1010. https://doi.org/10.1016/j.ijrmms.2007.02.002.
  6. Fakhimi, A., Carvalho, F., Ishida, T. and Labuz, J.F. (2002), "Simulation of failure around a circular opening in rock", Int. J. Rock Mech. Min. Sci., 39(4), 507-515. https://doi.org/10.1016/S1365-1609(02)00041-2.
  7. Fan, L. and Liu, S. (2017), "A conceptual model to characterize and model compaction behavior and permeability evolution of broken rock mass in coal mine gobs", Int. J. Coal Geol., 172, 60-70. https://doi.org/10.1016/j.coal.2017.01.017.
  8. Fan, L. and Liu, S. (2019), "Fluid-dependent shear slip behaviors of coal fractures and their implications on fracture frictional strength reduction and permeability evolutions", Int. J. Coal Geol., 212, 103235. https://doi.org/10.1016/j.coal.2019.103235.
  9. Gong, B., Jiang, Y. and Chen, L. (2019) "Feasibility investigation of the mechanical behavior of methane hydrate-bearing specimens using the multiple failure method", J. Nat. Gas. Sci. Eng., 102915. https://doi.org/10.1016/j.jngse.2019.102915.
  10. Hazzard, J.F., Young, R.P. and Maxwell, S.C. (2000), "Micromechanical modeling of cracking and failure in brittle rocks". J. Geophys. Res. Solid Earth, 105(B7), 16683-16697. https://doi.org/10.1029/2000jb900085.
  11. Hebblewhite, B. and Galvin, J. (2017), "A review of the geomechanics aspects of a double fatality coal burst at Austar Colliery in NSW, Australia in April 2014", Int. J. Min. Sci. Technol., 27(1), 3-7. https://doi.org/10.1016/j.ijmst.2016.10.002.
  12. Huang, Y.H., Yang, S.Q. and Tian, W.L. (2019), "Cracking process of a granite specimen that contains multiple pre-existing holes under uniaxial compression", Fatigue Fract. Eng. Mater. Struct., 42(6), 1341-1356. https://doi.org/10.1111/ffe.12990.
  13. Jin, P.J., Wang, E.Y. and Song, D.Z. (2017), "Study on correlation of acoustic emission and plastic strain based on coal-rock damage theory" Geomech. Eng., 12(4), 627-637. https://doi.org/10.12989/gae.2017.12.4.627.
  14. Jose, A., Sanchidrian, P.S. and Lopez, L.M. (2007), "Energy components in rock blasting", Int. J. Rock Mech. Min. Sci., 44(1), 130-147. https://doi.org/10.1016/j.ijrmms.2006.05.002.
  15. Kim, J.S., Kim, G.Y., Baik, M.H., Finsterle, S. 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.
  16. Li, Y.H., Peng, J.Y., Zhang, F.P. and Qiu, Z.G. (2016) "Cracking behavior and mechanism of sandstone containing a pre-cut hole under combined static and dynamic loading", Eng. Geol., 213(4), 64-73. https://doi.org/10.1016/j.enggeo.2016.08.006.
  17. Lin, P., Wong, R.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. https://doi.org/10.1016/j.ijrmms.2015.04.017.
  18. Marek, U. (2009), "Monitoring of methane and rockburst hazards as a condition of safe coal exploitation in the mines of Kompania Weglowa SA", Proc. Earth Planet. Sci., 1(1), 54-59. https://doi.org/10.1016/j.proeps.2009.09.011.
  19. Mark, C. (2016), "Coal bursts in the deep longwall mines of the United States", Int. J. Coal Sci. Technol., 3(1), 1-9. https://doi.org/10.1007/s40789-016-0102-9.
  20. Mark, C. and Gauna, M. (2016), "Evaluating the risk of coal bursts in underground coal mines", Int. J. Min. Sci. Technol., 26(1), 47-52. https://doi.org/10.1016/j.ijmst.2015.11.009.
  21. Mu, W., Li, L., Yang, T., Yu, G. and Han, Y. (2019), "Numerical investigation on a grouting mechanism with slurry-rock coupling and shear displacement in a single rough fracture", Bull. Eng. Geol. Environ., 4, 1-19. https://doi.org/10.1007/s10064-019-01535-w.
  22. Munoz, H., Taheri, A. and Chanda, E.K. (2016), "Rock drilling performance evaluation by an energy dissipation based rock brittleness index", Rock Mech. Rock Eng., 49(8), 3343-3355. https://doi.org/10.1007/s00603-016-0986-0.
  23. Nugroho A. and Purnama A.B. (2015), "Displacement distribution model of andesite rock mass due to blasting activity using finite element method", Indo. Min. J., 18(2), 47-58. https://doi.org/10.30556/imj.Vol18.No2.2015.289.
  24. Park J.W., Park D., Ryu D.W., Choi B.H. and Park E.S. (2014), "Analysis on heat transfer and heat loss characteristics of rock cavern thermal energy storage", Eng. Geol., 181, 142-156. https://doi.org/10.1016/j.enggeo.2014.07.006.
  25. Potyondy, D.O. and Cundall, P.A. (2004), "A bonded-particle model for rock", Int. J. Rock Mech. Min. Sci., 41(8), 1329-1364. https://doi.org/10.1016/j.ijrmms.2004.09.011.
  26. Sagasta, F., Zitto, M.E., Piotrkowski, R., Benavent-Climent, A., Suarez, E. and Gallego, A. (2018), "Acoustic emission energy b-value for local damage evaluation in reinforced concrete structures subjected to seismic loadings", Mech. Syst. Signal Proc., 102, 262-277. https://doi.org/10.1016/j.ymssp.2017.09.022.
  27. Sarfarazi, V., Haeri, H., Shemirani, A.B. and Nezamabadi, M.F. (2018), "A fracture mechanics simulation of the pre-holed concrete Brazilian discs", Struct. Eng. Mech., 66(3), 343-351. https://doi.org/10.12989/sem.2018.66.3.343.
  28. Singh, S.P. (1988), "Burst energy release index", Rock Mech. Rock Eng., 21(2), 149-155. https://doi.org/10.1007/BF01043119.
  29. Steffler, E.D., Epstein, J.S., and Conley, E.G. (2003), "Energy partitioning for a crack under remote shear and compression", Int. J. Fract., 120(4), 563-580. https://doi.org/10.1023/A:1025511703698.
  30. Sujatha, V. and Kishen, J.C. (2003), "Energy release rate due to friction at bimaterial interface in dams", J. Eng. Mech., 129(7), 793-800. https://doi.org/10.1061/(asce)0733-9399(2003)129:7(793).
  31. Wang, J., Ning, J.G, Qiu, P.Q., Yang, S. and Shang, H.F. (2019), "Microseismic monitoring and its precursory parameter of hard roof collapse in longwall faces: A case study", Geomech. Eng., 17(4), 375-383. https://doi.org/10.12989/gae.2019.17.4.375.
  32. Wasantha, P.L.P., Ranjith, P.G. and Shao, S.S. (2014), "Energy monitoring and analysis during deformation of bedded-sandstone: Use of acoustic emission", Ultrasonics, 54(1), 217-226. https://doi.org/10.1016/j.ultras.2013.06.015.
  33. Wong, R.H.C., Lin, P., and Tang, C.A. (2006), "Experimental and numerical study on splitting failure of brittle solids containing single pore under uniaxial compression", Mech. Mater., 38(1-2), 142-159. https://doi.org/10.1016/j.mechmat.2005.05.017.
  34. Zhang, M.S., Wang, S.H., and Yang, Y. (2011), "Numerical simulation of jointed rock mass constitutive model and its validation", Eng. Mech., 28(5), 26-30. https://doi.org/10.1631/jzus.A1000257.
  35. Zitto, M.E., Piotrkowski, R., Gallego, A., Sagasta, F. and Benavent-Climent A. (2015), "Damage assessed by wavelet scale bands and b-value in dynamical tests of a reinforced concrete slab monitored with acoustic emission", Mech. Syst. Signal Proc., 60, 75-89. https://doi.org/10.1016/j.ymssp.2015.02.006.

Cited by

  1. The Study of the Supernormal Mechanical Properties of Giant NPR Anchor Cables vol.2020, 2020, https://doi.org/10.1155/2020/2621909
  2. Numerical Simulation on Heat Transfer Characteristics of Water Flowing through the Fracture of High-Temperature Rock vol.2020, 2020, https://doi.org/10.1155/2020/8864028
  3. Assessment of the Excavation Damaged Zones in the Surrounding Rock of an Underground Powerhouse under High In Situ Stress Using an Acoustic Velocity Detecting Method vol.2020, 2020, https://doi.org/10.1155/2020/7297260
  4. Infrared Temperature Law and Deformation Monitoring of Layered Bedding Rock Slope under Static Load vol.2020, 2020, https://doi.org/10.1155/2020/8818278
  5. Physical Modeling Test on Deformation and Failure of Rock Slope with New Support System vol.2020, 2020, https://doi.org/10.1155/2020/8825220
  6. Experimental and Optimization Study on the Sliding Force Monitoring and Early Warning System for High and Steep Slopes vol.2020, 2020, https://doi.org/10.1155/2020/9071935
  7. Failure characteristics of sandstone specimens with randomly distributed pre-cracks under uniaxial compression vol.79, pp.9, 2020, https://doi.org/10.1007/s12665-020-08933-4