Proceedings of the 8th Russian-Chinese Symposium “Coal in the 21st Century: Mining, Processing, Safety"

Influences on Pressure Releasing by Blasting Breaking Hard Roof

Authors
Zhang Wei, Tan Yunliang, Guo Weiyao, Gu Shitan, Mu Dianrui, Hu Shanchao
Corresponding Author
Zhang Wei
Available Online October 2016.
DOI
https://doi.org/10.2991/coal-16.2016.31How to use a DOI?
Keywords
Hard Roof; Blasting Breaking Roof; Pressure Releasing Effect; Charge Structure; Blasting Parameters
Abstract
In order to optimize and upgrade the pressure releasing effect of blasting breaking hard roof, influence factors of it was analyzed by theoretical analysis, numerical simulation and field practice. Firstly, the impact on charge structure (charge uncoupling coefficient K, charge axial coefficient le and charge radius rb) was analyzed by indexes of fracture zone radius and crush zone radius. Secondly, the evolution trend of pressure releasing effect of different blasting parameters (angle of blasting hole, length of blasting hole and explosive charge) was studied by numerical simulation. Results show that blasting effect improves obviously with increase of charge radius and explosive charge. Reducing charge uncoupling coefficient K under the premise of using uncoupling charge ways and taking axial continuous charge way are beneficial for improving blasting effect. When the angle of blasting hole is 45° and it penetrates hard roof rock, pressure releasing effect is better. Combined with the construction equipment and materials in a mine, the charge structure and blasting parameters were designed, and a good application effect was got
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Proceedings
8th Russian-Chinese Symposium “Coal in the 21st Century: Mining, Processing, Safety"
Part of series
Advances in Engineering Research
Publication Date
October 2016
ISBN
978-94-6252-233-6
ISSN
2352-5401
DOI
https://doi.org/10.2991/coal-16.2016.31How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - CONF
AU  - Zhang Wei
AU  - Tan Yunliang
AU  - Guo Weiyao
AU  - Gu Shitan
AU  - Mu Dianrui
AU  - Hu Shanchao
PY  - 2016/10
DA  - 2016/10
TI  - Influences on Pressure Releasing by Blasting Breaking Hard Roof
BT  - 8th Russian-Chinese Symposium “Coal in the 21st Century: Mining, Processing, Safety"
PB  - Atlantis Press
SP  - 152
EP  - 157
SN  - 2352-5401
UR  - https://doi.org/10.2991/coal-16.2016.31
DO  - https://doi.org/10.2991/coal-16.2016.31
ID  - Wei2016/10
ER  -