Huang, X.; Guo, J.; Miao, Y.; Xie, X.; Li, Y.; Wang, H.; Huang, F. A Study on the Roof-Cutting and Pressure Releasing Technology of Roof Blasting. Appl. Sci.2023, 13, 9968.
Huang, X.; Guo, J.; Miao, Y.; Xie, X.; Li, Y.; Wang, H.; Huang, F. A Study on the Roof-Cutting and Pressure Releasing Technology of Roof Blasting. Appl. Sci. 2023, 13, 9968.
Huang, X.; Guo, J.; Miao, Y.; Xie, X.; Li, Y.; Wang, H.; Huang, F. A Study on the Roof-Cutting and Pressure Releasing Technology of Roof Blasting. Appl. Sci.2023, 13, 9968.
Huang, X.; Guo, J.; Miao, Y.; Xie, X.; Li, Y.; Wang, H.; Huang, F. A Study on the Roof-Cutting and Pressure Releasing Technology of Roof Blasting. Appl. Sci. 2023, 13, 9968.
Abstract
The surrounding rock during the coal mine excavation is prone to significant engineering disasters such as considerable deformation and rockbursts. Pressure release can improve the stress field of a deep rock mass and prevent the occurrence of dangers such as roadway collapse and coal and gas outbursts. This paper uses the ANSYS/LS-DYNA finite element software to simulate the crush area and fracture zone of a detonation charge with different diameters under in-situ stress. The stability of the surrounding rock was analyzed based on the impact stress and velocity, and was verified by field tests. The research results show that the blasting load primarily affects the damaged area near the borehole, while the in-situ stress affects the far-field crack propagation. The crack propagates in the direction of high surrounding rock pressure. When the uncoupling index is 1.5, the impact pressure of the 60 mm diameter cartridge is 8 times that of the 20 mm diameter cartridge. The impact speed can reach 2 times that of the 20 mm diameter cartridge. The high-energy event of the roof is transferred to the front of the working face, the distribution is no longer concentrated, and a better blasting pressure relief effect is achieved. The research results can help guide the prevention and control measures of rock bursts and other mining disasters.
Keywords
Roof-cutting blasting; Pressure-relief blasting; Deep rock mass; Rock burst; Fracture zone
Subject
Engineering, Mining and Mineral Processing
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
