Structural Engineering and Mechanics

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The numerical investigation of tensile strength of coal model on the performance of coal plow using Particle Flow Code

  • Fu, Jinwei (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power) ;
  • Haeri, Hadi (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power) ;
  • Sarfarazi, Vahab (Department of Mining Engineering, Hamedan University of Technology) ;
  • Marji, Mohammad Fatehi (Mine Exploitation Engineering Department, Faculty of Mining and Metallurgy, Institution of Engineering) ;
  • Li, Tong (School of Civil Engineering and Transportation, North China University of Water Resources and Electric Power)
  • Received : 2021.11.21
  • Accepted : 2022.03.19
  • Published : 2022.06.25
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Abstract

Effects of coal tensile strength and plow configuration on the coal fragmentation process was modeled by two-dimensional particles flow code (PFC2D). Three tensile strength values, 0.5, 1,5 and 3.5 MPa were considered in this numerical study. The cutters of plow penetrated in the coal for 4 mm at a rate of 0.016 m/s. According to the PFC manual, the local damping factor was 0.7. Three failure mechanism of coal during the fragmentation process by plow were modelled. The coal material beneath the cutters showed the elastic, plastic and fracturing behaviors in this analysis. In all the models, the plastic zone was fractured and some micro-cracks were induced but the elastic zone remained undamaged. It was observed that the tensile strength affected the failure mechanism of coal significantly and as it increased the extent of the fractured zone underneath the plow cutter decreased during the fragmentation process.

Keywords

References

  1. Akbas, S. (2016), "Analytical solutions for static bending of edge cracked micro beams", Struct. Eng. Mech., 59(3), 66-78. https://doi.org/10.12989/sem.2016.59.3.066.
  2. Bar-Cohen, Y. and Zacny, K. (2009), Drilling in Extreme Environments: Penetration and Sampling on Earth and other Planets, Wiley-VCH Verlag, Weinheim, Germany.
  3. Cheng, J.L., Jiang, Z.H., Han, W.F., Li, M.L. and Wang, Y.X. (2020), "Breakage mechanism of hard-rock penetration by TBM disc cutter after high pressure water jet precutting", Eng. Fract. Mech., 240, 107320. https://doi.org/10.1016/j.engfracmech.2020.107320.
  4. Choi, S.W., Chang, S.H., Park, Y.T., Lee, G.P. and Bae, G.J. (2014), "Comparative analysis of cutter acting forces and axial stresses of single and double disc cutters by linear cutting tests", J. Korean Tunnel. Underg. Space Assoc., 16(2), 181-191. (in Korean) http://doi.org/10.9711/KTAJ.2014.16.2.181.
  5. Copur, H., Aydin, H., Bilgin, N., Balci, C., Tumac, D. and Dayanc, C. (2014), "Predicting performance of EPB TBMs by using a stochastic model implemented into a deterministic model", Tunnel. Underg. Space Technol., 42(3), 1-14. http://doi.org/10.1016/j.tust.2014.01.006.
  6. Das, R. and Cleary, P.W. (2015), "Application of a mesh-free method to modelling brittle fracture and fragmentation of a concrete column during projectile impact", Comput. Concrete, 16(6), 933-961. https://doi.org/10.12989/cac.2015.16.6.933.
  7. Golewski, G.L. (2021a), "Evaluation of fracture processes under shear with the use of DIC technique in fly ash concrete and accurate measurement of crack path lengths with the use of a new crack tip tracking method", Measure., 181, 109632. https://doi.org/10.1016/j.measurement.2021.109632.
  8. Golewski, G.L. (2021b), "Validation of the favorable quantity of fly ash in concrete and analysis of crack propagation and its length-Using the crack tip tracking (CTT) method - In the fracture toughness examinations under Mode II, through digital image correlation", Constr. Build. Mater., 296, 122362. https://doi.org/10.1016/j.conbuildmat.2021.122362.
  9. Lee, J. and Hong, J.W. (2018), "Crack initiation and fragmentation processes in pre-cracked rock-like materials", Geomech. Eng., 15(5), 1047-1059. https://doi.org/10.12989/gae.2018.15.5.1047.
  10. Li, B., Zhang, B., Hu, M., Liu, B., Cao, W. and Xu, B. (2022), "Full-scale linear cutting tests to study the influence of pre-groove depth on rock-cutting performance by TBM disc cutter", Tunnel. Underg. Space Technol., 122, 104366. https://doi.org/10.1016/j.tust.2022.104366
  11. Li, Y. and Zhou, H. (2018), "Numerical investigations on stability evaluation of a jointed rock slope during excavation using an optimized DDARF method", Geomech. Eng., 14(3), 232-243. https://doi.org/10.12989/gae.2018.14.3.232.
  12. Liu, B., Yang, H. and Karekal, S. (2021), "Reliability analysis of TBM disc cutters under different conditions", Underg. Space, 6(2), 142-152. https://doi.org/10.1016/j.undsp.2020.01.001.
  13. Liu, H.Y. (2004), "Numerical modelling of the rock fragmentation process by mechanical tools", PhD Thesis, Lulea University of Technology, Sweden.
  14. Liu, X. (2020), "Experimental and numerical study on pre-peak cyclic shear mechanism of artificial rock joints", Struct. Eng. Mech., 74(3), 221-234. https://doi.org/10.12989/sem.2020.74.3.221.
  15. Ma, H., Yin, L. and Ji, H. (2011), "Numerical study of the effect of confining stress on rock fragmentation by TBM cutters", Int. J. Rock Mech. Min. Sci., 48(6), 1021-1033. https://doi.org/10.1016/j.ijrmms.2011.05.002.
  16. Ma, H.S., Yin, L.J. and Ji, H.G. (2011), "Numerical study of the effect of confining stress on rock fragmentation by TBM cutters", Int. J. Rock Mech. Min. Sci., 48(6), 1021-1033. http://dx.doi.org/10.1016/j.ijrmms.2011.05.002 .
  17. Mishnaevsky, L.L. (1995), "Physical mechanisms of hard rock fragmentation under mechanical loading: A review", Int. J. Rock Mech. Min. Sci., 32, 763-776. https://doi.org/10.1016/0148-9062(95)00027-E
  18. Potyondy, D.O. and Cundall, P.A.,(2004), "A bonded-particle model for rock", Int. J. Rock Mech. Min. Sci., 41, 1329-1364. https://doi.org/10.1016/j.ijrmms.2004.09.011.
  19. Rostami, J. (2013), "Study of pressure distribution within the crushed zone in the contact area between rock and disc cutters", Int. J. Rock Mech. Min. Sci., 57(1), 172-186. http://doi.org/10.1016/j.ijrmms.2012.07.031.
  20. Saksala, T., Gomon, D., Hokka, M. and Kuokkala, V.T. (2014), "Numerical and experimental studies of percussive drilling with a triple-button bit on Kuru granite", Int. J. Impact Eng., 72, 56-66. https://doi.org/10.1016/j.ijimpeng.2014.05.006.
  21. Shaowei, H., Aiqing, X., Xin, H. and Yangyang, Y. (2016), "Study on fracture characteristics of reinforced concrete wedge splitting tests", Comput. Concrete, 18(3). 337-354. https://doi.org/10.12989/cac.2016.18.3.337.
  22. Szostak, B. and Golewski, G.L, (2018), "Effect of nano admixture of CSH on selected strength parameters of concrete including fly ash", IOP Conf. Ser.: Mater. Sci. Eng., 52(41), 52096601.
  23. Szostak, B. and Golewski, G.L. (2020), "Improvement of strength parameters of cement matrix with the addition of siliceous fly ash by using nanometric C-S-H seeds", Energies, 13(24), 6734. https://doi.org/10.3390/en13246734.
  24. Szostak, B. and Golewski, G.L. (2021), "Rheology of cement pastes with siliceous fly ash and the CSH nano-admixture", Mater., 14(13), 3640. https://doi.org/10.3390/ma14133640.
  25. Wang, X., Yuan, W., Yan, Y. and Zhang, X. (2020), "Scale effect of mechanical properties of jointed rock mass: A numerical study based on particle flow code", Geomech. Eng., 21(3), 259-268. https://doi.org/10.12989/gae.2020.21.3.259.
  26. Wu, N., Liang, Z., Li, Y., Qian, X. and Gong, B. (2019), "Effect of confining stress on representative elementary volume of jointed rock masses", Geomech. Eng., 18(6), 627-638. https://doi.org/10.12989/gae.2019.18.6.627.
  27. Xia, Y.M., Guo, B., Cong, G.Q., Zhang, X.H. and Zeng, G.Y. (2017), "Numerical simulation of rock fragmentation induced by a single TBM disc cutter close to a side free surface", Int. J. Rock Mech. Min. Sci., 91, 40-48. https://doi.org/10.1016/j.ijrmms.2016.11.004.
  28. Xue, Y., Zhou, J., Liu, C., Shadabfar, M. and Zhang, J. (2021), "Rock fragmentation induced by a TBM disc-cutter considering the effects of joints: A numerical simulation by DEM", Comput. Geotech., 136, 104230. https://doi.org/10.1016/j.compgeo.2021.104230.
  29. Yaylac, M. (2016), "The investigation crack problem through numerical analysis", Struct. Eng. Mech., 57(6), 1143-1156. https://doi.org/10.12989/sem.2016.57.6.1143.
  30. Yin, L., Miao, C., He, G., Dai, F. and Gong, Q. (2016), "Study on the influence of joint spacing on rock fragmentation under TBM cutter by linear cutting test", Tunnel. Underg. Space Technol., 57, 137-144. https://doi.org/10.1016/j.tust.2016.02.018.
  31. Yin, L.J., Gong, Q.M., Ma, H.S., Zhao, J. and Zhao, X.B. (2014), "Use of indentation tests to study the influence of confining stress on rock fragmentation by a TBM cutter", Int. J. Rock Mech. Min. Sci., 72, 261-276. https://doi.org/10.1016/j.ijrmms.2014.07.022.
  32. Yin, L.J., Gong, Q.M., Ma, H.S., Zhao, J. and Zhao, X.B. (2014), "Use of indentation tests to study the influence of confining stress on rock fragmentation by a TBM cutter", Int. J. Rock Mech. Min. Sci., 72, 261-276. http://doi.org/10.1016/j.ijrmms.2014.07.022.
  33. Zang, A. and Stephansson, O. (2010), Stress Field of the Earth's Crust, Springer Science & Business Media.
  34. Zhai, S.F., Zhou, X.P., Bi, J. and Xiao, N. (2016), "The effects of joints on rock fragmentation by TBM cutters using General Particle Dynamics", Tunnel. Underg. Space Technol., 57, 162-172. https://doi.org/10.1016/j.tust.2016.01.035.
  35. Zhu, X. and Liu, W. (2018), "The rock fragmentation mechanism and plastic energy dissipation analysis of rock indentation", Geomech. Eng., 16(2), 195-204. https://doi.org/10.12989/gae.2018.16.2.195.