Journal
ENERGIES
Volume 14, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/en14030562
Keywords
directional hydraulic fracturing; UDEC; rock burst prevention; numerical model of longwall
Categories
Funding
- Faculty of Mining, Safety Engineering and Industrial Automation, Silesian University of Technology
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This article analyzes the effectiveness of directional hydraulic fracturing (DHF) in preventing rock burst in black coal mining with a longwall system. Observations on seismic activity and numerical modeling were conducted to study the impact of DHF on rock mass behavior during coal mining.
The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method of rock burst prevention, used in black coal mining with a longwall system. In order to define changes in seismic activity due to DHF at the Rydultowy Black Coal Mine (Upper Silesia, Poland), observations were made regarding the seismic activity of the rock mass during coal mining with a longwall system using roof layers collapse. The seismic activity was recorded in the area of the longwall itself, where, on a part of the runway, the rock mass was expanded before the face of the wall by interrupting the continuity of the rock layers using DHF. The following article presents measurements in the form of the number and the shock energy in the area of the observed longwall, which took place before and after the use of DHF. The second part of the article unveils the results of numerical modeling using the discrete element method, allowing to track the formation of goafs for the variant that does not take DHF into consideration, as well as with modeled fractures tracing DHF carried out in accordance with the technology used at Rydultowy coal mine.
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