THERMAL SCIENCE

International Scientific Journal

INFLUENCE RANGE SIMULATION OF LOOSE BLASTING BOREHOLE IN THE COAL-ROCK MASS

ABSTRACT
The influence scope of the blasting borehole is the key factor to the construction of loose blasting measures. A non-linear numerical model considering the multi-physical coupling factors, including in-situ stress, coal damage, and gas migration, etc., is established, and the model is solved by Comsol Multiphyscics software. The influence range of gas migration is analyzed, and the influence scope is determined to be between 3.5 m and 4.0 m. The change law of gas concentration and gas volume in test boreholes around blasting boreholes are investigated, and the effective influence range of loose blasting is about between 3.5 m and 4.0 m. The consistency between field test and numerical simulation results show that the effective influence range of loose blasting can be regard as about 3.5 m. The conclusions of this study provide an effective solution for improving the effect of loose blasting as a local anti-penetration measure and determining the reasonable parameter of hole placement.
KEYWORDS
PAPER SUBMITTED: 2018-06-07
PAPER REVISED: 2018-09-12
PAPER ACCEPTED: 2019-03-10
PUBLISHED ONLINE: 2019-05-26
DOI REFERENCE: https://doi.org/10.2298/TSCI180607211L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE 3, PAGES [1457 - 1464]
REFERENCES
  1. Zhou, F.B., et al., Recent Developments in Coal Mine Methane Extraction and Utilization in China: A Review, Journal of Natural Gas Science and Engineering, 31(2016), Apr., pp.437-458
  2. Xia, T.Q., et al., A Fully Coupled Coal Deformation and Compositional Flow Model for the Control of the Pre-Mining Coal Seam Gas Extraction, International Journal of Rock Mechanics & Mining Sciences, 72(2014), Dec., pp.138-148
  3. Ma, G.W., et al., Numerical Simulation of Blasting-Induced Rock Fractures, International Journal of Rock Mechanics & Mining Sciences,45(2007), 6, pp.966-975
  4. Yang, X.J., A New Integral Transform Operator for Solving the Heat-diffusion Problem. Applied Mathematics Letters,64(2017), Feb., pp.193-197
  5. Yang, X.J., et al., A New Numerical Technique for Local Fractional Diffusion Equation in Fractal Heat Transfer, Journal of Nonlinear Science and Applications, 9(2016), 10, pp. 5621-5628
  6. Drzewiecki J., et al., Dynamic Events in Roof Strata-Occurrence and Prevention, Coal Science and Technology Magazine, 1(2008), 1, pp. 55-57
  7. Lekontsev Y.M., et al.,Directional Hydraulic Fracturing in Difficult Caving Roof Control and Coal Degassing, Journal of Mining Science, 50 (2015), 5, pp. 914-917
  8. Konicek, P., et al., Long-Hole Destress Blasting for Rock burst Control during Deep Underground Coal Mining, International Journal of Rock Mechanics and Mining Sciences, 61(2013), 5, pp. 141-153
  9. Sawmliana, C., et al., A New Blastability Index for Hard Roof Management in Blasting Gallery Method, Geo-technical and Geological Engineering, 30 (2012), 6, pp. 1357-1367
  10. Song, J.,et al., Micromechanical Modeling of the Dynamic Fracture Process during Rock Blasting, International Journal of Rock Mechanics and Mining Sciences & Geo-mechanics Abstracts, 33 (1996), 3, pp. 387-394
  11. Zuo, J.P., et al., A Study of Fractal Deep-Hole Blasting and Its Induced Stress Behavior of Hard Roof Strata in Bayangaole Coal Mine, China, Advances in Civil Engineering, 2019, 14 pages
  12. He, F.L., et al., Study on Depressurizing Control of the Surrounding Rock of a Roadway along Gob Area in Sub-Level Caving Mining, Journal of China Coal Society, 25 (2000), 6, pp. 589-592
  13. Li H., et al., Experimental Analysis of Rock Mass Rupture Range by Mine Production Blasting, Blasting, 33 (2016), 2, pp.45-48
  14. Sun, K.M., et al., Numerical Simulation on Crack Propagation Law of Pre-Splitting Explosion in Lowly Permeable Coal Seam, Blasting, 31 (2014) , 1, pp. 32-37
  15. Furlong J.R, et al., Modeling the Dynamic Load/Unload Behavior of Ceramics under Impact Loading RDA-TR-0030-0001, R&D Associates, Arlington, VA. 1990

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence