Directional Hydraulic Fracturing (DHF) of the Roof, as an Element of Rock Burst Prevention in the Light of Underground Observations and Numerical Modelling

Energies

Marek Jendryś¹  Andrzej Hadam²  Mateusz Ćwiękała³ 

[1] Department of Geomechanics and Underground Construction, Faculty of Mining, Safety Engineering and Industrial Automation, Silesian University of Technology, ul. Akademicka 2, 44-100 Gliwice, Poland;“Marcel” Coal Mine, Oddział Kopalnia Węgla Kamiennego ROW, Polska Grupa Górnicza S.A., ul. Korfantego 52, 44-310 Radlin, Poland;“Rydułtowy” Coal Mine, Oddział Kopalnia Węgla Kamiennego ROW, Polska Grupa Górnicza S.A., ul. Leona 2, 44-280 Rydułtowy, Poland;

关键词: directional hydraulic fracturing;    UDEC;    rock burst prevention;    numerical model of longwall;   

DOI  :  10.3390/en14030562

来源: DOAJ

【 摘 要 】

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 “Rydułtowy” 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 “Rydułtowy” coal mine.

【 授权许可】

Unknown