Influences on Pressure Releasing by Blasting Breaking Hard Roof
Zhang Wei, Tan Yunliang, Guo Weiyao, Gu Shitan, Mu Dianrui, Hu Shanchao
Available Online October 2016.
- https://doi.org/10.2991/coal-16.2016.31How to use a DOI?
- Hard Roof; Blasting Breaking Roof; Pressure Releasing Effect; Charge Structure; Blasting Parameters
- 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
- 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 - Proceedings of the 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 -