Journal
ENERGIES
Volume 10, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/en10111874
Keywords
extra-thick coal seam; roof presplitting; transfer of dynamic load; fracture propagation; presplitting by blasting
Categories
Funding
- Fundamental Research Funds for the Central Universities [2017QNA23]
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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.
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