THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Numerical modeling of liquid CO2 phase transition blasting based on SPH algorithm

ABSTRACT
Liquid CO2 phase transition blasting is a physical blasting method to enhance permeability through liquid CO2 phase transition expansion. To study the propagation criterion of fractures during blasting, the energy of phase transition blasting is evaluated through the thermodynamic equation by studying the action process of the liquid CO2 blasting, thus obtaining the scope of the smash zone and crack zone as well as the propagation criterion of fractures under the effect of high-pressure gas. The gas blasting model for a coal body is established based on the SPH algorithm, thus obtaining the criteria for formation of the smash zone and for generation and propagation of the crack zone. Moreover, the radius of phase transition blasting is surveyed onsite by the peephole method. It is shown that the explosive energy of the MZL-51/2000 phase transition blasting equipment with a release pressure of 270 MPa is 1510 kJ. The coal body is crushed by the high-pressure CO2 percussive drilling, forming the smash zone. Meanwhile, fractures are generated around the smash zone. With the expansion and migration of the gas, the fracture will further grow into a crack zone. The fracture inside the coal body goes through four states: rapid, slow, rapid, and then slow again. According to field surveys, the blasting radius of the MZL-51/2000 equipment with loaded liquid of 1.8 kg is approximately 3 m.
KEYWORDS
PAPER SUBMITTED: 2018-05-01
PAPER REVISED: 2018-09-20
PAPER ACCEPTED: 2018-12-15
PUBLISHED ONLINE: 2019-03-31
DOI REFERENCE: https://doi.org/10.2298/TSCI180501083Y
REFERENCES
  1. Wang, Z., Numerical analysis of blast-induced wave propagation and spalling damage in a rock plate, International Journal of Rock Mechanics & Mining Sciences, 45 (2008), 4, pp. 600-608
  2. Gasmi, H., Numerical Homogenization of Jointed Rock Masses Using Wave Propagation Simulation, Rock Mechanics & Rock Engineering, 47 (2014), 4, pp. 1393-1409
  3. Wang, Z., et al., Numerical analysis of blast-induced wave propagation and spalling damage in a rock plate, International Journal of Rock Mechanics and Mining Sciences, 45 (2008), 1, pp. 600-608
  4. Pan, P., et al., Numerical Study on Damage and Fracture Degree of Rock Mass Induced by Blasting Mining, Metal Mine, 6 (2016), 1, pp. 1-7
  5. Wei, X., et al., Numerical simulations of rock mass damage induced by underground explosion, International Journal of Rock Mechanics and Mining Sciences, 46 (2009), 1, pp. 1206-1213
  6. Ma, G., et al., Numerical simulation of blasting-induced rock fractures, Int J Rock Mech Mining Sci, 45 (2008), 3, pp. 966-975
  7. Sivakumar, G., et al., Finite element simulation of crack initiation and propagation in rocks, Rock Engineering and Rock Mechanics, 41(2014), 8, pp. 829-834
  8. Devuyst, T., et al., Coupling between meshless and finite element methods, International Journal of Impact Engineering, 31(2005), 8, pp. 1054-1064
  9. Campbell, J., et al., A contact algorithm for smoothed particle hydrodynamics, Computer Methods in Applied Mechanics and Engineering, 184(2000), 1, pp. 49-65
  10. Xue, Y., et al., An elastoplastic model for gas flow characteristics around drainage borehole considering post-peak failure and elastic compaction, Environmental Earth Sciences, 77 (2018), 19, pp. 669
  11. Li, C., et al., Experiment of dynamic property and transient magnetic effects of coal during deformation and fracture, Journal of Coal Science and Engineering (China), 6 (2012), 3, pp. 258-261
  12. Chu, H., Theoretical and experimental studies on coal blasting action mechanism, Henan Polytechnic University, 2011.
  13. Xue, Y., et al., Evaluation of the Non-Darcy Effect of Water Inrush from Karst Collapse Columns by Means of a Nonlinear Flow Model, Water, 10 (2018), 9, pp. 1234
  14. Paine, A., Please, C., An Improved Model of Fracture Propagation by Gas during Rock Blasting-Some Analytical Results, International Journal of Rock Mechanics and Mining Sciences, 31 (1994), 6, pp. 699-706
  15. Xie, B., Experimental research on characteristics of coal impact damage dynamics and magnetic field, China University of Mining and Technology (Bejing), 2013
  16. Pei, X., Numerical Simulation for Compressive Residual Stress and Surface Morphology of Shot-peening Based on SPH Method, Shandong University, 2013
  17. Li, Y., The Numerical Simulation Researches on the Law of Improving the Permeability of Low Permeability Coal Seam by Air Blasting, Liaoning Technical University, 2015