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Arabian Journal for Science and Engineering

, Volume 43, Issue 7, pp 3717–3724 | Cite as

Experimental Research on Stress Relief of High-Stress Coal Based on Noncoupling Blasting

  • Zhigang Liu
  • Anye CaoEmail author
  • Guolei Liu
  • Jinxiu Li
Research Article - Earth Sciences
  • 135 Downloads

Abstract

To discuss the mechanism and effects of noncoupling stress-relief blasting under high stress, theoretical analyses, laboratory experiments, and spot verifications were performed in this study. In addition, by studying the coal blasting mechanism, a theoretical formula to calculate the radius of the fracture area was determined. According to the noncoupling blasting characteristics, a stress relieving test for confined specimens was designed, and the results showed a significant stress reduction in the specimens after blasting. The stress and acoustic emissions showed that a noncoupling charge can relieve stress extremely well in a confined specimen. Combined with practical worksite conditions, for noncoupling stress-relief blasting, a deep hole was drilled into a deep-mine roadway with a high stress concentration, and we observed the electromagnetic radiation and coal stress to verify the effects. The result indicated that the technique had a positive effect on relieving the high stress concentration in roadways.

Keywords

Rock bursts Stress-relief blasting Noncoupling blasting Stress concentration Blasting experiment 

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Notes

Acknowledgements

This work was supported by “the Fundamental Research Funds for the Central Universities” (Grant No. 2017BSCXB47), “the Postgraduate Research & Practice Innovation Program of Jiangsu Province” (Grant No. KYCX17_1558) and “the Project of PADD funded by the Priority Academic Programme Development of Jiangsu Higher Education Instruction” (Grant No. SZBF2011-6-B35).

References

  1. 1.
    Jiang, Y.D.; Pan, Y.S.; Dou, L.M.; Ju, Y.: State of the art review on mechanism and prevention of coal bumps in China. J. China Coal Soc. 39.2(9), 205–213 (2014). (in Chinese) Google Scholar
  2. 2.
    Stacey, T.R.: A philosophical view on the testing of rock support for rockburst conditions. S. Afr. Inst. Min. Metall. 112(8), 01–08 (2011)Google Scholar
  3. 3.
    Qi, Q.X.; Li, X.L.; Zhao, S.K.: Theory and practices on stress control of mine pressure bumping. Coal Sci. Technol. 41(06), 1–5 (2013). (in Chinese) Google Scholar
  4. 4.
    Yang, R.S.; Wang, Y.B.: Experimental study of dynamic fracture effect of blasting crack in slotted cartridge decoupling charge blasting. Chinese J. Rock Mech. Eng. 32(7), 1337–1343 (2013). (in Chinese) Google Scholar
  5. 5.
    Xu, Y.; Ding, G.Y.; Zong, Q.; Shen, Z.W.: Study on the characteristics of rock fragmetation and energy distribution by blast stress wave. Met. Mine 30(2), 13–16 (2002). (in Chinese) Google Scholar
  6. 6.
    Wei, M.Y.; Wang, E.Y.; Liu, X.F.; Wang, C.: Numerical simulation of rockburst prevention effect by blasting pressure relief in deep coal seam. Rock Soil Mech. 32(8), 2539–2560 (2011). (in Chinese) Google Scholar
  7. 7.
    Gao, F.; Zhou, K.P.; Luo, X.W.; Zhai, J.B.: Effect of induction unloading on weakening of rock mechanics properties. Trans. Nonferr. Met. Soc. China 22(2), 419–424 (2012). (in Chinese) CrossRefGoogle Scholar
  8. 8.
    Luo, Y.: Study on linear shaped charge in penetrating rock. Eng. Sci. 6(2), 50–54 (2008). (in Chinese) Google Scholar
  9. 9.
    Guo, J.Q.: Study on the mechanism of rock burst prevention by the solid-liquid coupling blast cracking and its application. China University of Mining and Technology, Beijing (2010). (in Chinese) Google Scholar
  10. 10.
    Sun, X.M.; Xu, H.C.; He, M.C.; Zhang, F.: Experimental investigation of the occurrence of rockburst in a rock specimen through infrared thermography and acoustic emission. Int. J. Rock Mech. Min. Sci. 93, 250–259 (2017)Google Scholar
  11. 11.
    Jiang, B.Y.; Wang, L.G.; Lu, Y.L.; Wang, C.Q.; Ma, D.: Combined early warning method for rockburst in a deep island, fully mechanized caving face. Arab. J. Geosci. 9(20), 743 (2016)CrossRefGoogle Scholar
  12. 12.
    Sun, X.; Lin, B.Q.; Dong, T.; Hui, G.L.; Zhang, Z.Y.; Zhu, C.J.; Wang, H.: Deep crossing-hole controlled hydraulic blasting and its application in outburst prevention. J. Min. Saf. Eng. 27(1), 82–86 (2010). (in Chinese) Google Scholar
  13. 13.
    Yang, Z.Q.; Dou, L.M.; Liu, C.; Xu, M.T.; Lei, Z.; Yao, Y.H.: Application of high-pressure water jet technology and the theory of rock burst control in roadway. Int. J. Min. Sci. Technol. 26(5), 929–935 (2016)CrossRefGoogle Scholar
  14. 14.
    He, J.; Dou, L.M.; Gong, S.Y.; Li, J.; Ma, Z.Q.: Rock burst assessment and prediction by dynamic and static stress analysis based on micro-seismic monitoring. Int. J. Rock Mech. Min. Sci. 93, 46–53 (2017)Google Scholar
  15. 15.
    Fan, J.Y.; Fang, Q.; Zhang, Y.D.; Li, C.: Experimental investigation on the TNT equivalence coefficient of a rock emulsion explosive. Acta Armamentarii 32(10), 1243–1249 (2011)Google Scholar
  16. 16.
    Cao, A.Y.; Dou, L.M.; Wang, C.B.; Yao, X.X.; Dong, J.Y.; Gu, Y.: Microseismic precursory characteristics of rock burst hazard in mining areas near a large residual coal pillar: a case study from Xuzhuang Coal Mine, Xuzhou, China. Rock Mech. Rock Eng. 49(11), 4407–4422 (2016)CrossRefGoogle Scholar
  17. 17.
    Dou, L.; He, X.Q.; Wang, E.Y.; Gu, D.Z.: Electromagnetic emissions in rock and coal burst failures. J. Tsinghua Univ. 41(12), 86–88 (2001). (in Chinese) Google Scholar
  18. 18.
    Liu, Z.G.; Cao, A.Y.; Zhu, G.A.; Wang, C.B.: Numerical simulation and engineering practice for optimal parameters of deep-hole blasting in sidewalls of roadway. Arab. J. Sci. Eng. 42(9), 3809–3818 (2017)CrossRefGoogle Scholar
  19. 19.
    Cao, A.Y.; Dou, L.M.; Cai, W.; Gong, S.Y.; Liu, S.; Zhao, Y.L.: Tomographic imaging of high seismic activities in underground island longwall face. Arab. J. Geosci. 9(3), 1–10 (2016)CrossRefGoogle Scholar
  20. 20.
    Shao, C.Y.; Liu, Z.G.: Pressure-relief effect verification of deep-hole uncoupled charge blasting technology. Coal Min. Technol. 3, 110–113 (2015). (in Chinese) Google Scholar

Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of MinesChina University of Mining and TechnologyXuzhouChina
  2. 2.School of Resources and Environmental EngineeringShandong University of TechnologyZiboChina
  3. 3.Shandong College of Mining TechnicalZiboChina

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