Welcome to Francis Academic Press

Academic Journal of Engineering and Technology Science, 2019, 2(2); doi: 10.25236/AJETS.020047.

Application of advanced deep hole blasting technology for thick and hard roof weakening in Xinji Coalmine


Shoulong Ma1,*

Corresponding Author:
Shoulong Ma

1 China Coal Energy Group Co., Ltd. Xin Ji Group, Huainan 232001, Anhui, China
*Corresponding Author


According to the roof rock mass characteristics of the 210108 working face of the Xinji Coalmine, the initial pressure step distance and periodic pressure step distance of the roof and the corresponding support model and working resistance are calculated. According to calculation results, the blasting step of the roof weakening is determined to be 25m. The field application shows that the hard and hard blasting roof is transformed into a caving roof, which changes the characteristics of the rock pressure in the working face, and has obtained good results in the experiment, and provides a reference for similar projects.


hard roof, weakening, advanced deep hole blasting, blasting parameter

Cite This Paper

Shoulong Ma. Application of advanced deep hole blasting technology for thick and hard roof weakening in Xinji Coalmine. Academic Journal of Engineering and Technology Science (2019) Vol. 2 Issue 2: 110-117. https://doi.org/10.25236/AJETS.020047.


[1] A.Y. Gao and L.M. Dou (2008). Analysis of focal mechanism caused by rupture of stope roof. Chinese Journal of Rock Mechanics and Engineering, vol.27, no.S2, p.3833-3839.
[2] Q. Wang, S.C. Li and Z. Li (2012).  Analysis of roof collapse mechanism and supporting measures in fault zone of coal roadway. Rock and Soil Mechanics, vol.33, no.10, p.3093-3102.
[3] Z.Z. Huang(2013). Study on laws of roof strata fracture of fully mechanized caving mining under goaf in ultra thick seam. Coal Science and Technology, vol.41, no.7, p.60-62.
[4] J.W. Guo and J.W. Zhao (2012). Study on breaking law and control mechanism of lower roof in gob-side entry retaining. Journal of Mining & Safety Engineering, vol.29, no.11, p.802-807.
[5] G.L. Xu and Z. Zhang (2012). Study of roof breaking regularity and supports suitability at fully- mechanized caving face in thick coal seam with deep inclined and three soft. Coal Technology, vol.31, no.7, p.71-73.
[6] S.G. Zhang, L. Yang and M.T. Gao (2013). Analysis on roof broken law based on two kinds of sublevel caving hydraulic support. Coal Science and Technology, vol.41, no.S1, p.17-18.
[7] S.G. Cao, H.J. Jiang and F.H. Wang (2013). Numerical simulation of overlying hard strata rupture in a coal face. Journal of Mining & Safety Engineering, vol.30, no.2, p.205-210.
[8] W.Y. Huang, S.L. Yan and Z.G. Liu (2012). Research and application of water gel explosive grain on coal mine gas extraction in coal seam deep hole blasting. Journal of China Coal Society, vol.37, no.3, p.472-476.
[9] N. Zhao, G.L. Dai and W.Y. Huang (2014). Research and application of deep hole pre-splitting blasting forced caving technology. Journal of Safety Science and Technology, vol.10, no.4, p.38-42.
[10] D.Y. Guo, D.Y. Shang and P.F. Lu (2013). Experimental research of deep-hole cumulative blasting in hard roof weakening. Journal of China Coal Society, vol.38, no.7, p.1149-1153.
[11] C.R. Li, L.J. Kang and Q.X. Qi (2009). Numerical simulation of deep-hole blasting and its application in mine roof weaken. Journal of China Coal Society, vol.34, no.12, p.1632-1636.
[12] X. Xu, Y. Xu and J.G. Fu (2017). Parameter optimization design of roof-weakening blasting based on PPV safety criteria. Coal Engineering, vol.49, no.4, p.43-45.
[13] M.F. Sheng and Z.Y. Yuan (2014). Analysis on strata behavior characteristics under hard and thick roof weakened with blasting. Coal Engineering, vol.46, no.10, p.173-176.