Application of Confined Blasting in Water-Filled Deep Holes to Control Strong Rock Pressure in Hard Rock Mines

In extra-thick coal seams, mining operations can lead to large-scale disturbances, complex overburden structures, and frequent and strong strata behavior in the stope, which are serious threats to mine safety. This study analyzed the overburden structure and strata behavior and proposed the techniqu...

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Bibliographic Details
Published in:Energies (Basel) 2017-11, Vol.10 (11), p.1874
Main Authors: Yang, Jingxuan, Liu, Changyou, Yu, Bin
Format: Article
Language:English
Subjects:
Blasting
Coal mines
Coal mining
Compression
Energy
Explosives
extra-thick coal seam
fracture propagation
High temperature
Hydraulic engineering
Hydroelectric power
Incompressibility
Mines
Mining accidents & safety
Mining industry
Overburden
Presplitting
presplitting by blasting
Pressure
Propagation
roof presplitting
Threat evaluation
transfer of dynamic load
Viscosity
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Summary:In extra-thick coal seams, mining operations can lead to large-scale disturbances, complex overburden structures, and frequent and strong strata behavior in the stope, which are serious threats to mine safety. This study analyzed the overburden structure and strata behavior and proposed the technique of confined blasting in water-filled deep holes as a measure to prevent strong rock pressure. It found that there are two primary reasons for the high effectiveness of the proposed technique in presplitting hard coal and rock. First, the fracture water enables much more efficient transfer of dynamic load due to its incompressibility. Second, the subsequent expansion of water can further split the rock by compression. A mechanical model was used to reveal how the process of confined blasting in water-filled deep holes presplit roof. Moreover, practical implementation of this technique was found to improve the structure of hard, thick roof and prevent strong rock pressure, demonstrating its effectiveness in roof control.
ISSN:1996-1073
1996-1073
DOI:10.3390/en10111874